diff options
| author | Jeff Layton <jlayton@redhat.com> | 2011-04-27 13:25:51 -0400 |
|---|---|---|
| committer | Paul Gortmaker <paul.gortmaker@windriver.com> | 2012-03-14 10:57:55 -0400 |
| commit | 6c245ccf08985a986f358dfc9fa8964756843072 (patch) | |
| tree | 98acbdb87243f567fb6f75baed7eeae35b8e208a | |
| parent | 5c6997e05926b59b5f7067077b7da41d5be99de3 (diff) | |
cifs: check for bytes_remaining going to zero in CIFS_SessSetup
commit fcda7f4578bbf9717444ca6da8a421d21489d078 upstream.
It's possible that when we go to decode the string area in the
SESSION_SETUP response, that bytes_remaining will be 0. Decrementing it at
that point will mean that it can go "negative" and wrap. Check for a
bytes_remaining value of 0, and don't try to decode the string area if
that's the case.
Reported-and-Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
| -rw-r--r-- | fs/cifs/sess.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c index c7d78c062a9e..ff4f5b1b2749 100644 --- a/fs/cifs/sess.c +++ b/fs/cifs/sess.c @@ -906,7 +906,9 @@ ssetup_ntlmssp_authenticate: } /* BB check if Unicode and decode strings */ - if (smb_buf->Flags2 & SMBFLG2_UNICODE) { + if (bytes_remaining == 0) { + /* no string area to decode, do nothing */ + } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { /* unicode string area must be word-aligned */ if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) { ++bcc_ptr; |