Merge tag '6.1-rc4-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6

Pull cifs fixes from Steve French:
 "One symlink handling fix and two fixes foir multichannel issues with
  iterating channels, including for oplock breaks when leases are
  disabled"

* tag '6.1-rc4-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: fix use-after-free on the link name
  cifs: avoid unnecessary iteration of tcp sessions
  cifs: always iterate smb sessions using primary channel

1 files changed, 25 insertions, 1 deletions

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index d0b9fec111aa..fe220686bba4 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -1143,8 +1143,32 @@ const struct inode_operations cifs_file_inode_ops = {
 	.fiemap = cifs_fiemap,
 };
 
+const char *cifs_get_link(struct dentry *dentry, struct inode *inode,
+			    struct delayed_call *done)
+{
+	char *target_path;
+
+	target_path = kmalloc(PATH_MAX, GFP_KERNEL);
+	if (!target_path)
+		return ERR_PTR(-ENOMEM);
+
+	spin_lock(&inode->i_lock);
+	if (likely(CIFS_I(inode)->symlink_target)) {
+		strscpy(target_path, CIFS_I(inode)->symlink_target, PATH_MAX);
+	} else {
+		kfree(target_path);
+		target_path = ERR_PTR(-EOPNOTSUPP);
+	}
+	spin_unlock(&inode->i_lock);
+
+	if (!IS_ERR(target_path))
+		set_delayed_call(done, kfree_link, target_path);
+
+	return target_path;
+}
+
 const struct inode_operations cifs_symlink_inode_ops = {
-	.get_link = simple_get_link,
+	.get_link = cifs_get_link,
 	.permission = cifs_permission,
 	.listxattr = cifs_listxattr,
 };