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authorJiri Slaby <jirislaby@gmail.com>2008-12-03 09:13:46 +0100
committerJeff Garzik <jgarzik@redhat.com>2008-12-09 00:43:54 -0500
commit9ac6212660fa3d8d0d21e782a22b956a6bc78a43 (patch)
tree8e42713b7160b4a0160ef1fda59cc7e3ad82e609
parent2456eb819be7aa2cac73359c2855dfa30e46d75a (diff)
downloadlinux-9ac6212660fa3d8d0d21e782a22b956a6bc78a43.tar.bz2
ATA: piix, fix pointer deref on suspend
Hi, I've found this issue in the mmotm 2008-12-02-17-08. -- Commit ata_piix: add borked Tecra M4 to broken suspend list introduced DMI variables checking, but they can be null, so that we possibly dereference null. Check if they are null and avoid checks in that case. Solves: BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 IP: [<ffffffff8043da97>] piix_pci_device_suspend+0x117/0x230 Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Cc: Jeff Garzik <jgarzik@redhat.com> Cc: Alexandru Romanescu <a_romanescu@yahoo.co.uk> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
-rw-r--r--drivers/ata/ata_piix.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index d6d97d8f3fa4..c11936e13dd3 100644
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -1072,7 +1072,14 @@ static int piix_broken_suspend(void)
* matching is necessary because dmi_system_id.matches is
* limited to four entries.
*/
- if (!strcmp(dmi_get_system_info(DMI_SYS_VENDOR), "TOSHIBA") &&
+ if (dmi_get_system_info(DMI_SYS_VENDOR) &&
+ dmi_get_system_info(DMI_PRODUCT_NAME) &&
+ dmi_get_system_info(DMI_PRODUCT_VERSION) &&
+ dmi_get_system_info(DMI_PRODUCT_SERIAL) &&
+ dmi_get_system_info(DMI_BOARD_VENDOR) &&
+ dmi_get_system_info(DMI_BOARD_NAME) &&
+ dmi_get_system_info(DMI_BOARD_VERSION) &&
+ !strcmp(dmi_get_system_info(DMI_SYS_VENDOR), "TOSHIBA") &&
!strcmp(dmi_get_system_info(DMI_PRODUCT_NAME), "000000") &&
!strcmp(dmi_get_system_info(DMI_PRODUCT_VERSION), "000000") &&
!strcmp(dmi_get_system_info(DMI_PRODUCT_SERIAL), "000000") &&