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smb: client: fix parsing of SMB3.1.1 POSIX create context 

commit 76025cc2285d9ede3d717fe4305d66f8be2d9346 upstream.

The data offset for the SMB3.1.1 POSIX create context will always be
8-byte aligned so having the check 'noff + nlen >= doff' in
smb2_parse_contexts() is wrong as it will lead to -EINVAL because noff
+ nlen == doff.

Fix the sanity check to correctly handle aligned create context data.

Fixes: af1689a9b770 ("smb: client: fix potential OOBs in smb2_parse_contexts()")
Signed-off-by: Paulo Alcantara <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Guruswamy Basavaiah <guruswamy.basavaiah@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paulo Alcantara 2024-01-19 01:08:26 -03:00 committed by Greg Kroah-Hartman
parent 1ae3c59355
commit 380aeff204
1 changed files with 1 additions and 1 deletions
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2
fs/smb/client/smb2pdu.c
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@ -2184,7 +2184,7 @@ int smb2_parse_contexts(struct TCP_Server_Info *server,
noff = le16_to_cpu(cc->NameOffset);
nlen = le16_to_cpu(cc->NameLength);
if (noff + nlen >= doff)
if (noff + nlen > doff)
return -EINVAL;
name = (char *)cc + noff;