From: Dan Carpenter <dan.carpenter@oracle.com>
To: Steve French <sfrench-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>
Cc: linux-cifs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
samba-technical-w/Ol4Ecudpl8XjKLYN78aQ@public.gmane.org,
kernel-janitors-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: [patch] cifs: check offset in decode_ntlmssp_challenge()
Date: Tue, 31 Jan 2012 08:52:01 +0000 [thread overview]
Message-ID: <20120131085201.GB22039@elgon.mountain> (raw)
We should check that we're not copying memory from beyond the end of the
blob.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index d85efad..eb76741 100644
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -395,6 +395,10 @@ static int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
ses->ntlmssp->server_flags = le32_to_cpu(pblob->NegotiateFlags);
tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
+ if (tioffset > blob_len || tioffset + tilen > blob_len) {
+ cERROR(1, "tioffset + tilen too high %u + %u", tioffset, tilen);
+ return -EINVAL;
+ }
if (tilen) {
ses->auth_key.response = kmalloc(tilen, GFP_KERNEL);
if (!ses->auth_key.response) {
next reply other threads:[~2012-01-31 8:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-31 8:52 Dan Carpenter [this message]
2012-01-31 10:49 ` [patch] cifs: check offset in decode_ntlmssp_challenge() Jeff Layton
2012-01-31 11:25 ` Dan Carpenter
2012-01-31 11:50 ` Jeff Layton
2012-01-31 13:43 ` Steve French
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