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SMB: fix validate negotiate info uninitialised memory use 

An undersize validate negotiate info server response causes the client
to use uninitialised memory for struct validate_negotiate_info_rsp
comparisons of Dialect, SecurityMode and/or Capabilities members.

Link: https://bugzilla.samba.org/show_bug.cgi?id=13092
Fixes: 7db0a6efdc ("SMB3: Work around mount failure when using SMB3 dialect to Macs")
Signed-off-by: David Disseldorp <ddiss@suse.de>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
David Disseldorp 2017-10-20 14:49:38 +02:00 committed by Steve French
parent fe83bebc05
commit a2d9daad1d
1 changed files with 2 additions and 1 deletions
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3
fs/cifs/smb2pdu.c
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@ -727,7 +727,8 @@ int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
rsplen);
/* relax check since Mac returns max bufsize allowed on ioctl */
if (rsplen > CIFSMaxBufSize)
if ((rsplen > CIFSMaxBufSize)
|| (rsplen < sizeof(struct validate_negotiate_info_rsp)))
goto err_rsp_free;
}