linux-kernel - [PATCH 3/4] BUG_ON on kernel misbehavior on A100U2W driver

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Date:	Tue, 15 Jul 2008 17:18:38 -0400 (EDT)
From:	Mikulas Patocka <mpatocka@...hat.com>
To:	torvalds@...ux-foundation.org
cc:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] BUG_ON on kernel misbehavior on A100U2W driver

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 <mpatocka@...hat.com>
---
 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) {
--
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