path: root/drivers
diff options
authorBen Dooks <ben-linux@fluff.org>2011-04-27 14:24:19 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2011-05-09 15:06:40 -0700
commit40e6af80dbcb551530b6c442564df01f9db3af33 (patch)
tree55b82bfeec189383e20757d9dd33f58d3e5a33aa /drivers
parent4e90d9686addf31f74821cacd54cda8c70a67038 (diff)
mmc: sdhci: Check mrq->cmd in sdhci_tasklet_finish
commit b7b4d3426d2b5ecab21578eb20d8e456a1aace8f upstream. It seems that under certain circumstances that the sdhci_tasklet_finish() call can be entered with mrq->cmd set to NULL, causing the system to crash with a NULL pointer de-reference. Unable to handle kernel NULL pointer dereference at virtual address 00000000 PC is at sdhci_tasklet_finish+0x34/0xe8 LR is at sdhci_tasklet_finish+0x24/0xe8 Seen on S3C6410 system. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Chris Ball <cjb@laptop.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 9e15f41f87b..fd8f488df5f 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1345,7 +1345,7 @@ static void sdhci_tasklet_finish(unsigned long param)
* upon error conditions.
if (!(host->flags & SDHCI_DEVICE_DEAD) &&
- (mrq->cmd->error ||
+ ((mrq->cmd && mrq->cmd->error) ||
(mrq->data && (mrq->data->error ||
(mrq->data->stop && mrq->data->stop->error))) ||