From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mikulas Patocka Subject: [PATCH 3/4] BUG_ON on kernel misbehavior on A100U2W driver Date: Tue, 15 Jul 2008 17:18:38 -0400 (EDT) Message-ID: References: Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Return-path: Received: from mx1.redhat.com ([66.187.233.31]:42564 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761054AbYGOVTL (ORCPT ); Tue, 15 Jul 2008 17:19:11 -0400 In-Reply-To: Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: torvalds@linux-foundation.org Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org With broken Sparc64 IOMMU accounting, the kernel submits larger requests then allowed. Better to crash on BUG than corrupt memory. Signed-off-by: Mikulas Patocka --- drivers/scsi/a100u2w.c | 1 + 1 file changed, 1 insertion(+) Index: linux-2.6.26-devel/drivers/scsi/a100u2w.c =================================================================== --- linux-2.6.26-devel.orig/drivers/scsi/a100u2w.c 2008-07-14 20:03:43.000000000 +0200 +++ linux-2.6.26-devel/drivers/scsi/a100u2w.c 2008-07-15 00:46:02.000000000 +0200 @@ -866,6 +866,7 @@ static void inia100_build_scb(struct orc count_sg = scsi_dma_map(cmd); BUG_ON(count_sg < 0); + BUG_ON(count_sg > TOTAL_SG_ENTRY); /* Build the scatter gather lists */ if (count_sg) {