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authorJesper Juhl <jj@chaosbits.net>2012-03-23 04:08:34 +0400
committerMatthew Garrett <mjg@redhat.com>2012-03-26 23:45:32 +0400
commit41603e9783a24c8c7cce548c0819bdc9e46a585b (patch)
treed309d27fd11f922cb20cab809ac3db9096ff2377 /drivers/platform/x86/amilo-rfkill.c
parenta979e2e2af7d5b4bb3b20f6a716c627bb23a6753 (diff)
downloadlinux-41603e9783a24c8c7cce548c0819bdc9e46a585b.tar.xz
drivers/platform/x86/amilo-rfkill.c::amilo_rfkill_probe() avoid NULL deref
In drivers/platform/x86/amilo-rfkill.c::amilo_rfkill_probe() the call to dmi_first_match() may fail and return NULL. If it does return NULL, then we'll be dereferencing a NULL pointer in the rfkill_alloc() call where we do 'system_id->driver_data' --> KABOOM! Avoid that problem by testing for a NULL return value from dmi_first_match() and bailing out if it fails. I was a bit uncertain about what to return in the failure case. In the end I settled for -ENXIO as the most logical error to return. Signed-off-by: Jesper Juhl <jj@chaosbits.net> Signed-off-by: Matthew Garrett <mjg@redhat.com>
Diffstat (limited to 'drivers/platform/x86/amilo-rfkill.c')
-rw-r--r--drivers/platform/x86/amilo-rfkill.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/platform/x86/amilo-rfkill.c b/drivers/platform/x86/amilo-rfkill.c
index 19170bb7700b..a514bf66fdd7 100644
--- a/drivers/platform/x86/amilo-rfkill.c
+++ b/drivers/platform/x86/amilo-rfkill.c
@@ -97,9 +97,12 @@ static struct rfkill *amilo_rfkill_dev;
static int __devinit amilo_rfkill_probe(struct platform_device *device)
{
+ int rc;
const struct dmi_system_id *system_id =
dmi_first_match(amilo_rfkill_id_table);
- int rc;
+
+ if (!system_id)
+ return -ENXIO;
amilo_rfkill_dev = rfkill_alloc(KBUILD_MODNAME, &device->dev,
RFKILL_TYPE_WLAN,