diff options
| -rw-r--r-- | fs/cifs/cifsacl.c | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c index 751d34bd825c..b0b114acdece 100644 --- a/fs/cifs/cifsacl.c +++ b/fs/cifs/cifsacl.c @@ -191,6 +191,8 @@ id_to_sid(unsigned int cid, uint sidtype, struct cifs_sid *ssid) { int rc; struct key *sidkey; + struct cifs_sid *ksid; + unsigned int ksid_size; char desc[3 + 10 + 1]; /* 3 byte prefix + 10 bytes for value + NULL */ const struct cred *saved_cred; @@ -211,14 +213,27 @@ id_to_sid(unsigned int cid, uint sidtype, struct cifs_sid *ssid) rc = -EIO; cFYI(1, "%s: Downcall contained malformed key " "(datalen=%hu)", __func__, sidkey->datalen); - goto out_key_put; + goto invalidate_key; } - cifs_copy_sid(ssid, (struct cifs_sid *)sidkey->payload.data); + + ksid = (struct cifs_sid *)sidkey->payload.data; + ksid_size = CIFS_SID_BASE_SIZE + (ksid->num_subauth * sizeof(__le32)); + if (ksid_size > sidkey->datalen) { + rc = -EIO; + cFYI(1, "%s: Downcall contained malformed key (datalen=%hu, " + "ksid_size=%u)", __func__, sidkey->datalen, ksid_size); + goto invalidate_key; + } + cifs_copy_sid(ssid, ksid); out_key_put: key_put(sidkey); out_revert_creds: revert_creds(saved_cred); return rc; + +invalidate_key: + key_invalidate(sidkey); + goto out_key_put; } static int @@ -264,6 +279,7 @@ sid_to_id(struct cifs_sb_info *cifs_sb, struct cifs_sid *psid, rc = -EIO; cFYI(1, "%s: Downcall contained malformed key " "(datalen=%hu)", __func__, sidkey->datalen); + key_invalidate(sidkey); goto out_key_put; } |