diff options
Diffstat (limited to 'fs/cifs')
| -rw-r--r-- | fs/cifs/smb2misc.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/fs/cifs/smb2misc.c b/fs/cifs/smb2misc.c index 2da6b41cb552..c2c5e4122a04 100644 --- a/fs/cifs/smb2misc.c +++ b/fs/cifs/smb2misc.c @@ -109,8 +109,17 @@ static __u32 get_neg_ctxt_len(struct smb2_sync_hdr *hdr, __u32 len, (pneg_rsp->DialectRevision != cpu_to_le16(SMB311_PROT_ID))) return 0; - /* Make sure that negotiate contexts start after gss security blob */ + /* + * if SPNEGO blob present (ie the RFC2478 GSS info which indicates + * which security mechanisms the server supports) make sure that + * the negotiate contexts start after it + */ nc_offset = le32_to_cpu(pneg_rsp->NegotiateContextOffset); + /* + * non_ctxlen is at least shdr->StructureSize + pdu->StructureSize2 + * and the latter is 1 byte bigger than the fix-sized area of the + * NEGOTIATE response + */ if (nc_offset + 1 < non_ctxlen) { pr_warn_once("Invalid negotiate context offset %d\n", nc_offset); return 0; |