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authorLinus Torvalds <torvalds@linux-foundation.org>2015-05-27 14:09:16 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-05-27 14:09:16 -0700
commitde182468d1bb726198abaab315820542425270b7 (patch)
tree2a24412b734c6e7911ef4268ed3b52750b3cdf75
parent8f98bcdf8f9638ee012ff09c6c8732e0fda6018a (diff)
parent4afe260bab50290a05e5732570329a530ed023f3 (diff)
Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6
Pull cifs fixes from Steve French: "Back from SambaXP - now have 8 small CIFS bug fixes to merge" * 'for-next' of git://git.samba.org/sfrench/cifs-2.6: CIFS: Fix race condition on RFC1002_NEGATIVE_SESSION_RESPONSE Fix to convert SURROGATE PAIR cifs: potential missing check for posix_lock_file_wait Fix to check Unique id and FileType when client refer file directly. CIFS: remove an unneeded NULL check [cifs] fix null pointer check Fix that several functions handle incorrect value of mapchars cifs: Don't replace dentries for dfs mounts
Diffstat
-rw-r--r--fs/cifs/cifs_dfs_ref.c3
-rw-r--r--fs/cifs/cifs_unicode.c182
-rw-r--r--fs/cifs/cifsfs.c2
-rw-r--r--fs/cifs/cifsproto.h4
-rw-r--r--fs/cifs/cifssmb.c23
-rw-r--r--fs/cifs/connect.c3
-rw-r--r--fs/cifs/dir.c3
-rw-r--r--fs/cifs/file.c7
-rw-r--r--fs/cifs/inode.c31
-rw-r--r--fs/cifs/link.c3
-rw-r--r--fs/cifs/readdir.c2
-rw-r--r--fs/cifs/smb1ops.c3
-rw-r--r--fs/cifs/smb2pdu.c2
13 files changed, 194 insertions, 74 deletions
diff --git a/fs/cifs/cifs_dfs_ref.c b/fs/cifs/cifs_dfs_ref.c
index 430e0348c99e..7dc886c9a78f 100644
--- a/fs/cifs/cifs_dfs_ref.c
+++ b/fs/cifs/cifs_dfs_ref.c
@@ -24,6 +24,7 @@
#include "cifsfs.h"
#include "dns_resolve.h"
#include "cifs_debug.h"
+#include "cifs_unicode.h"
static LIST_HEAD(cifs_dfs_automount_list);
@@ -312,7 +313,7 @@ static struct vfsmount *cifs_dfs_do_automount(struct dentry *mntpt)
xid = get_xid();
rc = get_dfs_path(xid, ses, full_path + 1, cifs_sb->local_nls,
&num_referrals, &referrals,
- cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
+ cifs_remap(cifs_sb));
free_xid(xid);
cifs_put_tlink(tlink);
diff --git a/fs/cifs/cifs_unicode.c b/fs/cifs/cifs_unicode.c
index 0303c6793d90..5a53ac6b1e02 100644
--- a/fs/cifs/cifs_unicode.c
+++ b/fs/cifs/cifs_unicode.c
@@ -27,41 +27,6 @@
#include "cifsglob.h"
#include "cifs_debug.h"
-/*
- * cifs_utf16_bytes - how long will a string be after conversion?
- * @utf16 - pointer to input string
- * @maxbytes - don't go past this many bytes of input string
- * @codepage - destination codepage
- *
- * Walk a utf16le string and return the number of bytes that the string will
- * be after being converted to the given charset, not including any null
- * termination required. Don't walk past maxbytes in the source buffer.
- */
-int
-cifs_utf16_bytes(const __le16 *from, int maxbytes,
- const struct nls_table *codepage)
-{
- int i;
- int charlen, outlen = 0;
- int maxwords = maxbytes / 2;
- char tmp[NLS_MAX_CHARSET_SIZE];
- __u16 ftmp;
-
- for (i = 0; i < maxwords; i++) {
- ftmp = get_unaligned_le16(&from[i]);
- if (ftmp == 0)
- break;
-
- charlen = codepage->uni2char(ftmp, tmp, NLS_MAX_CHARSET_SIZE);
- if (charlen > 0)
- outlen += charlen;
- else
- outlen++;
- }
-
- return outlen;
-}
-
int cifs_remap(struct cifs_sb_info *cifs_sb)
{
int map_type;
@@ -155,10 +120,13 @@ convert_sfm_char(const __u16 src_char, char *target)
* enough to hold the result of the conversion (at least NLS_MAX_CHARSET_SIZE).
*/
static int
-cifs_mapchar(char *target, const __u16 src_char, const struct nls_table *cp,
+cifs_mapchar(char *target, const __u16 *from, const struct nls_table *cp,
int maptype)
{
int len = 1;
+ __u16 src_char;
+
+ src_char = *from;
if ((maptype == SFM_MAP_UNI_RSVD) && convert_sfm_char(src_char, target))
return len;
@@ -168,10 +136,23 @@ cifs_mapchar(char *target, const __u16 src_char, const struct nls_table *cp,
/* if character not one of seven in special remap set */
len = cp->uni2char(src_char, target, NLS_MAX_CHARSET_SIZE);
- if (len <= 0) {
- *target = '?';
- len = 1;
- }
+ if (len <= 0)
+ goto surrogate_pair;
+
+ return len;
+
+surrogate_pair:
+ /* convert SURROGATE_PAIR and IVS */
+ if (strcmp(cp->charset, "utf8"))
+ goto unknown;
+ len = utf16s_to_utf8s(from, 3, UTF16_LITTLE_ENDIAN, target, 6);
+ if (len <= 0)
+ goto unknown;
+ return len;
+
+unknown:
+ *target = '?';
+ len = 1;
return len;
}
@@ -206,7 +187,7 @@ cifs_from_utf16(char *to, const __le16 *from, int tolen, int fromlen,
int nullsize = nls_nullsize(codepage);
int fromwords = fromlen / 2;
char tmp[NLS_MAX_CHARSET_SIZE];
- __u16 ftmp;
+ __u16 ftmp[3]; /* ftmp[3] = 3array x 2bytes = 6bytes UTF-16 */
/*
* because the chars can be of varying widths, we need to take care
@@ -217,9 +198,17 @@ cifs_from_utf16(char *to, const __le16 *from, int tolen, int fromlen,
safelen = tolen - (NLS_MAX_CHARSET_SIZE + nullsize);
for (i = 0; i < fromwords; i++) {
- ftmp = get_unaligned_le16(&from[i]);
- if (ftmp == 0)
+ ftmp[0] = get_unaligned_le16(&from[i]);
+ if (ftmp[0] == 0)
break;
+ if (i + 1 < fromwords)
+ ftmp[1] = get_unaligned_le16(&from[i + 1]);
+ else
+ ftmp[1] = 0;
+ if (i + 2 < fromwords)
+ ftmp[2] = get_unaligned_le16(&from[i + 2]);
+ else
+ ftmp[2] = 0;
/*
* check to see if converting this character might make the
@@ -234,6 +223,17 @@ cifs_from_utf16(char *to, const __le16 *from, int tolen, int fromlen,
/* put converted char into 'to' buffer */
charlen = cifs_mapchar(&to[outlen], ftmp, codepage, map_type);
outlen += charlen;
+
+ /* charlen (=bytes of UTF-8 for 1 character)
+ * 4bytes UTF-8(surrogate pair) is charlen=4
+ * (4bytes UTF-16 code)
+ * 7-8bytes UTF-8(IVS) is charlen=3+4 or 4+4
+ * (2 UTF-8 pairs divided to 2 UTF-16 pairs) */
+ if (charlen == 4)
+ i++;
+ else if (charlen >= 5)
+ /* 5-6bytes UTF-8 */
+ i += 2;
}
/* properly null-terminate string */
@@ -296,6 +296,46 @@ success:
}
/*
+ * cifs_utf16_bytes - how long will a string be after conversion?
+ * @utf16 - pointer to input string
+ * @maxbytes - don't go past this many bytes of input string
+ * @codepage - destination codepage
+ *
+ * Walk a utf16le string and return the number of bytes that the string will
+ * be after being converted to the given charset, not including any null
+ * termination required. Don't walk past maxbytes in the source buffer.
+ */
+int
+cifs_utf16_bytes(const __le16 *from, int maxbytes,
+ const struct nls_table *codepage)
+{
+ int i;
+ int charlen, outlen = 0;
+ int maxwords = maxbytes / 2;
+ char tmp[NLS_MAX_CHARSET_SIZE];
+ __u16 ftmp[3];
+
+ for (i = 0; i < maxwords; i++) {
+ ftmp[0] = get_unaligned_le16(&from[i]);
+ if (ftmp[0] == 0)
+ break;
+ if (i + 1 < maxwords)
+ ftmp[1] = get_unaligned_le16(&from[i + 1]);
+ else
+ ftmp[1] = 0;
+ if (i + 2 < maxwords)
+ ftmp[2] = get_unaligned_le16(&from[i + 2]);
+ else
+ ftmp[2] = 0;
+
+ charlen = cifs_mapchar(tmp, ftmp, codepage, NO_MAP_UNI_RSVD);
+ outlen += charlen;
+ }
+
+ return outlen;
+}
+
+/*
* cifs_strndup_from_utf16 - copy a string from wire format to the local
* codepage
* @src - source string
@@ -409,10 +449,15 @@ cifsConvertToUTF16(__le16 *target, const char *source, int srclen,
char src_char;
__le16 dst_char;
wchar_t tmp;
+ wchar_t *wchar_to; /* UTF-16 */
+ int ret;
+ unicode_t u;
if (map_chars == NO_MAP_UNI_RSVD)
return cifs_strtoUTF16(target, source, PATH_MAX, cp);
+ wchar_to = kzalloc(6, GFP_KERNEL);
+
for (i = 0; i < srclen; j++) {
src_char = source[i];
charlen = 1;
@@ -441,11 +486,55 @@ cifsConvertToUTF16(__le16 *target, const char *source, int srclen,
* if no match, use question mark, which at least in
* some cases serves as wild card
*/
- if (charlen < 1) {
- dst_char = cpu_to_le16(0x003f);
- charlen = 1;
+ if (charlen > 0)
+ goto ctoUTF16;
+
+ /* convert SURROGATE_PAIR */
+ if (strcmp(cp->charset, "utf8") || !wchar_to)
+ goto unknown;
+ if (*(source + i) & 0x80) {
+ charlen = utf8_to_utf32(source + i, 6, &u);
+ if (charlen < 0)
+ goto unknown;
+ } else
+ goto unknown;
+ ret = utf8s_to_utf16s(source + i, charlen,
+ UTF16_LITTLE_ENDIAN,
+ wchar_to, 6);
+ if (ret < 0)
+ goto unknown;
+
+ i += charlen;
+ dst_char = cpu_to_le16(*wchar_to);
+ if (charlen <= 3)
+ /* 1-3bytes UTF-8 to 2bytes UTF-16 */
+ put_unaligned(dst_char, &target[j]);
+ else if (charlen == 4) {
+ /* 4bytes UTF-8(surrogate pair) to 4bytes UTF-16
+ * 7-8bytes UTF-8(IVS) divided to 2 UTF-16
+ * (charlen=3+4 or 4+4) */
+ put_unaligned(dst_char, &target[j]);
+ dst_char = cpu_to_le16(*(wchar_to + 1));
+ j++;
+ put_unaligned(dst_char, &target[j]);
+ } else if (charlen >= 5) {
+ /* 5-6bytes UTF-8 to 6bytes UTF-16 */
+ put_unaligned(dst_char, &target[j]);
+ dst_char = cpu_to_le16(*(wchar_to + 1));
+ j++;
+ put_unaligned(dst_char, &target[j]);
+ dst_char = cpu_to_le16(*(wchar_to + 2));
+ j++;
+ put_unaligned(dst_char, &target[j]);
}
+ continue;
+
+unknown:
+ dst_char = cpu_to_le16(0x003f);
+ charlen = 1;
}
+
+ctoUTF16:
/*
* character may take more than one byte in the source string,
* but will take exactly two bytes in the target string
@@ -456,6 +545,7 @@ cifsConvertToUTF16(__le16 *target, const char *source, int srclen,
ctoUTF16_out:
put_unaligned(0, &target[j]); /* Null terminate target unicode string */
+ kfree(wchar_to);
return j;
}
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index f5089bde3635..0a9fb6b53126 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -469,6 +469,8 @@ cifs_show_options(struct seq_file *s, struct dentry *root)
seq_puts(s, ",nouser_xattr");
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
seq_puts(s, ",mapchars");
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
+ seq_puts(s, ",mapposix");
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
seq_puts(s, ",sfu");
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index c31ce98c1704..c63fd1dde25b 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -361,11 +361,11 @@ extern int CIFSUnixCreateHardLink(const unsigned int xid,
extern int CIFSUnixCreateSymLink(const unsigned int xid,
struct cifs_tcon *tcon,
const char *fromName, const char *toName,
- const struct nls_table *nls_codepage);
+ const struct nls_table *nls_codepage, int remap);
extern int CIFSSMBUnixQuerySymLink(const unsigned int xid,
struct cifs_tcon *tcon,
const unsigned char *searchName, char **syminfo,
- const struct nls_table *nls_codepage);
+ const struct nls_table *nls_codepage, int remap);
extern int CIFSSMBQuerySymLink(const unsigned int xid, struct cifs_tcon *tcon,
__u16 fid, char **symlinkinfo,
const struct nls_table *nls_codepage);
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 84650a51c7c4..f26ffbfc64d8 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -2784,7 +2784,7 @@ copyRetry:
int
CIFSUnixCreateSymLink(const unsigned int xid, struct cifs_tcon *tcon,
const char *fromName, const char *toName,
- const struct nls_table *nls_codepage)
+ const struct nls_table *nls_codepage, int remap)
{
TRANSACTION2_SPI_REQ *pSMB = NULL;
TRANSACTION2_SPI_RSP *pSMBr = NULL;
@@ -2804,9 +2804,9 @@ createSymLinkRetry:
if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
name_len =
- cifs_strtoUTF16((__le16 *) pSMB->FileName, fromName,
- /* find define for this maxpathcomponent */
- PATH_MAX, nls_codepage);
+ cifsConvertToUTF16((__le16 *) pSMB->FileName, fromName,
+ /* find define for this maxpathcomponent */
+ PATH_MAX, nls_codepage, remap);
name_len++; /* trailing null */
name_len *= 2;
@@ -2828,9 +2828,9 @@ createSymLinkRetry:
data_offset = (char *) (&pSMB->hdr.Protocol) + offset;
if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
name_len_target =
- cifs_strtoUTF16((__le16 *) data_offset, toName, PATH_MAX
- /* find define for this maxpathcomponent */
- , nls_codepage);
+ cifsConvertToUTF16((__le16 *) data_offset, toName,
+ /* find define for this maxpathcomponent */
+ PATH_MAX, nls_codepage, remap);
name_len_target++; /* trailing null */
name_len_target *= 2;
} else { /* BB improve the check for buffer overruns BB */
@@ -3034,7 +3034,7 @@ winCreateHardLinkRetry:
int
CIFSSMBUnixQuerySymLink(const unsigned int xid, struct cifs_tcon *tcon,
const unsigned char *searchName, char **symlinkinfo,
- const struct nls_table *nls_codepage)
+ const struct nls_table *nls_codepage, int remap)
{
/* SMB_QUERY_FILE_UNIX_LINK */
TRANSACTION2_QPI_REQ *pSMB = NULL;
@@ -3055,8 +3055,9 @@ querySymLinkRetry:
if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
name_len =
- cifs_strtoUTF16((__le16 *) pSMB->FileName, searchName,
- PATH_MAX, nls_codepage);
+ cifsConvertToUTF16((__le16 *) pSMB->FileName,
+ searchName, PATH_MAX, nls_codepage,
+ remap);
name_len++; /* trailing null */
name_len *= 2;
} else { /* BB improve the check for buffer overruns BB */
@@ -4917,7 +4918,7 @@ getDFSRetry:
strncpy(pSMB->RequestFileName, search_name, name_len);
}
- if (ses->server && ses->server->sign)
+ if (ses->server->sign)
pSMB->hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
pSMB->hdr.Uid = ses->Suid;
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index f3bfe08e177b..8383d5ea4202 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -386,6 +386,7 @@ cifs_reconnect(struct TCP_Server_Info *server)
rc = generic_ip_connect(server);
if (rc) {
cifs_dbg(FYI, "reconnect error %d\n", rc);
+ mutex_unlock(&server->srv_mutex);
msleep(3000);
} else {
atomic_inc(&tcpSesReconnectCount);
@@ -393,8 +394,8 @@ cifs_reconnect(struct TCP_Server_Info *server)
if (server->tcpStatus != CifsExiting)
server->tcpStatus = CifsNeedNegotiate;
spin_unlock(&GlobalMid_Lock);
+ mutex_unlock(&server->srv_mutex);
}
- mutex_unlock(&server->srv_mutex);
} while (server->tcpStatus == CifsNeedReconnect);
return rc;
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 338d56936f6a..c3eb998a99bd 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -620,8 +620,7 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
}
rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
cifs_sb->local_nls,
- cifs_sb->mnt_cifs_flags &
- CIFS_MOUNT_MAP_SPECIAL_CHR);
+ cifs_remap(cifs_sb));
if (rc)
goto mknod_out;
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index cafbf10521d5..3f50cee79df9 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -140,8 +140,7 @@ int cifs_posix_open(char *full_path, struct inode **pinode,
posix_flags = cifs_posix_convert_flags(f_flags);
rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data,
poplock, full_path, cifs_sb->local_nls,
- cifs_sb->mnt_cifs_flags &
- CIFS_MOUNT_MAP_SPECIAL_CHR);
+ cifs_remap(cifs_sb));
cifs_put_tlink(tlink);
if (rc)
@@ -1553,8 +1552,8 @@ cifs_setlk(struct file *file, struct file_lock *flock, __u32 type,
rc = server->ops->mand_unlock_range(cfile, flock, xid);
out:
- if (flock->fl_flags & FL_POSIX)
- posix_lock_file_wait(file, flock);
+ if (flock->fl_flags & FL_POSIX && !rc)
+ rc = posix_lock_file_wait(file, flock);
return rc;
}
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 55b58112d122..f621b44cb800 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -373,8 +373,7 @@ int cifs_get_inode_info_unix(struct inode **pinode,
/* could have done a find first instead but this returns more info */
rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data,
- cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
- CIFS_MOUNT_MAP_SPECIAL_CHR);
+ cifs_sb->local_nls, cifs_remap(cifs_sb));
cifs_put_tlink(tlink);
if (!rc) {
@@ -402,9 +401,25 @@ int cifs_get_inode_info_unix(struct inode **pinode,
rc = -ENOMEM;
} else {
/* we already have inode, update it */
+
+ /* if uniqueid is different, return error */
+ if (unlikely(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM &&
+ CIFS_I(*pinode)->uniqueid != fattr.cf_uniqueid)) {
+ rc = -ESTALE;
+ goto cgiiu_exit;
+ }
+
+ /* if filetype is different, return error */
+ if (unlikely(((*pinode)->i_mode & S_IFMT) !=
+ (fattr.cf_mode & S_IFMT))) {
+ rc = -ESTALE;
+ goto cgiiu_exit;
+ }
+
cifs_fattr_to_inode(*pinode, &fattr);
}
+cgiiu_exit:
return rc;
}
@@ -839,6 +854,15 @@ cifs_get_inode_info(struct inode **inode, const char *full_path,
if (!*inode)
rc = -ENOMEM;
} else {
+ /* we already have inode, update it */
+
+ /* if filetype is different, return error */
+ if (unlikely(((*inode)->i_mode & S_IFMT) !=
+ (fattr.cf_mode & S_IFMT))) {
+ rc = -ESTALE;
+ goto cgii_exit;
+ }
+
cifs_fattr_to_inode(*inode, &fattr);
}
@@ -2215,8 +2239,7 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
pTcon = tlink_tcon(tlink);
rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
cifs_sb->local_nls,
- cifs_sb->mnt_cifs_flags &
- CIFS_MOUNT_MAP_SPECIAL_CHR);
+ cifs_remap(cifs_sb));
cifs_put_tlink(tlink);
}
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index 252e672d5604..e6c707cc62b3 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -717,7 +717,8 @@ cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
rc = create_mf_symlink(xid, pTcon, cifs_sb, full_path, symname);
else if (pTcon->unix_ext)
rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
- cifs_sb->local_nls);
+ cifs_sb->local_nls,
+ cifs_remap(cifs_sb));
/* else
rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,
cifs_sb_target->local_nls); */
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index b4a47237486b..b1eede3678a9 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -90,6 +90,8 @@ cifs_prime_dcache(struct dentry *parent, struct qstr *name,
if (dentry) {
inode = d_inode(dentry);
if (inode) {
+ if (d_mountpoint(dentry))
+ goto out;
/*
* If we're generating inode numbers, then we don't
* want to clobber the existing one with the one that
diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index 7bfdd6066276..fc537c29044e 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -960,7 +960,8 @@ cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
/* Check for unix extensions */
if (cap_unix(tcon->ses)) {
rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path,
- cifs_sb->local_nls);
+ cifs_sb->local_nls,
+ cifs_remap(cifs_sb));
if (rc == -EREMOTE)
rc = cifs_unix_dfs_readlink(xid, tcon, full_path,
target_path,
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 65cd7a84c8bc..54cbe19d9c08 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -110,7 +110,7 @@ smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
/* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
/* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
- if ((tcon->ses) &&
+ if ((tcon->ses) && (tcon->ses->server) &&
(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
hdr->CreditCharge = cpu_to_le16(1);
/* else CreditCharge MBZ */
generated by cgit v1.2.3-70-g09d2 (git 2.51.1) at 2025-11-04 04:50:06 +0000