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

Mikulas Patocka
2008-07-15T21:19:11Z

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@redhat.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) {