linux-kernel - [PATCH 3.2 178/185] aacraid: prevent invalid pointer dereference

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Message-ID: <lsq.1388282924.68024822@decadent.org.uk>
Date:	Sun, 29 Dec 2013 03:08:44 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Nico Golde" <nico@...lde.de>,
	"Mahesh Rajashekhara" <Mahesh.Rajashekhara@...s.com>,
	"Fabian Yamaguchi" <fabs@...sec.de>
Subject: [PATCH 3.2 178/185] aacraid: prevent invalid pointer dereference

3.2.54-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Mahesh Rajashekhara <Mahesh.Rajashekhara@...s.com>

commit b4789b8e6be3151a955ade74872822f30e8cd914 upstream.

It appears that driver runs into a problem here if fibsize is too small
because we allocate user_srbcmd with fibsize size only but later we
access it until user_srbcmd->sg.count to copy it over to srbcmd.

It is not correct to test (fibsize < sizeof(*user_srbcmd)) because this
structure already includes one sg element and this is not needed for
commands without data.  So, we would recommend to add the following
(instead of test for fibsize == 0).

Signed-off-by: Mahesh Rajashekhara <Mahesh.Rajashekhara@...s.com>
Reported-by: Nico Golde <nico@...lde.de>
Reported-by: Fabian Yamaguchi <fabs@...sec.de>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/scsi/aacraid/commctrl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/scsi/aacraid/commctrl.c
+++ b/drivers/scsi/aacraid/commctrl.c
@@ -508,7 +508,8 @@ static int aac_send_raw_srb(struct aac_d
 		goto cleanup;
 	}
 
-	if (fibsize > (dev->max_fib_size - sizeof(struct aac_fibhdr))) {
+	if ((fibsize < (sizeof(struct user_aac_srb) - sizeof(struct user_sgentry))) ||
+	    (fibsize > (dev->max_fib_size - sizeof(struct aac_fibhdr)))) {
 		rcode = -EINVAL;
 		goto cleanup;
 	}

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