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authorJiri Slaby <jslaby@suse.cz>2011-02-28 10:16:29 +0100
committerWim Van Sebroeck <wim@iguana.be>2011-03-09 21:33:37 +0000
commitd406577526a611e6be1f6b1cfeaf094dd95fa439 (patch)
tree9b4e97d33a9e18ce003eda0e3446dac9c6ec1828 /drivers/watchdog/sbc_fitpc2_wdt.c
parenta5abba989deceb731047425812d268daf7536575 (diff)
downloadlinux-d406577526a611e6be1f6b1cfeaf094dd95fa439.tar.bz2
watchdog: sbc_fitpc2_wdt, fix crash on systems without DMI_BOARD_NAME
Some systems don't provide DMI_BOARD_NAME in their DMI tables. Avoid crash in such situations in fitpc2_wdt_init. The fix is to check if the dmi_get_system_info return value is NULL. The oops: BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<ffffffff81253ae6>] strstr+0x26/0xa0 PGD 3966e067 PUD 39605067 PMD 0 Oops: 0000 [#1] SMP last sysfs file: /sys/devices/system/cpu/cpu1/cache/index2/shared_cpu_map CPU 1 Modules linked in: ... Pid: 1748, comm: modprobe Not tainted 2.6.37-22-default #1 /Bochs RIP: 0010:[<ffffffff81253ae6>] [<ffffffff81253ae6>] strstr+0x26/0xa0 RSP: 0018:ffff88003ad73f18 EFLAGS: 00010206 RAX: 0000000000000000 RBX: 00000000ffffffed RCX: 00000000ffffffff RDX: ffffffffa003f4cc RSI: ffffffffa003f4c2 RDI: 0000000000000000 ... CR2: 0000000000000000 CR3: 000000003b7ac000 CR4: 00000000000006e0 ... Process modprobe (pid: 1748, threadinfo ffff88003ad72000, task ffff88002e6365c0) Stack: ... Call Trace: [<ffffffffa004201f>] fitpc2_wdt_init+0x1f/0x13c [sbc_fitpc2_wdt] [<ffffffff810002da>] do_one_initcall+0x3a/0x170 ... Code: f3 c3 0f 1f 00 80 3e 00 53 48 89 f8 74 1b 48 89 f2 0f 1f 40 00 48 83 c2 01 80 3a 00 75 f7 49 89 d0 48 89 f8 49 29 f0 75 02 5b c3 <80> 3f 00 74 0e 0f 1f 44 00 00 48 83 c0 01 80 38 00 75 f7 49 89 Signed-off-by: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog/sbc_fitpc2_wdt.c')
-rw-r--r--drivers/watchdog/sbc_fitpc2_wdt.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/watchdog/sbc_fitpc2_wdt.c b/drivers/watchdog/sbc_fitpc2_wdt.c
index c7d67e9a7465..79906255eeb6 100644
--- a/drivers/watchdog/sbc_fitpc2_wdt.c
+++ b/drivers/watchdog/sbc_fitpc2_wdt.c
@@ -201,11 +201,14 @@ static struct miscdevice fitpc2_wdt_miscdev = {
static int __init fitpc2_wdt_init(void)
{
int err;
+ const char *brd_name;
- if (!strstr(dmi_get_system_info(DMI_BOARD_NAME), "SBC-FITPC2"))
+ brd_name = dmi_get_system_info(DMI_BOARD_NAME);
+
+ if (!brd_name || !strstr(brd_name, "SBC-FITPC2"))
return -ENODEV;
- pr_info("%s found\n", dmi_get_system_info(DMI_BOARD_NAME));
+ pr_info("%s found\n", brd_name);
if (!request_region(COMMAND_PORT, 1, WATCHDOG_NAME)) {
pr_err("I/O address 0x%04x already in use\n", COMMAND_PORT);