diff options
| author | Chris Ball <cjb@laptop.org> | 2011-04-27 17:35:31 -0400 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2011-04-27 19:16:50 -0400 |
| commit | 0c9c99a765321104cc5f9c97f949382a9ba4927e (patch) | |
| tree | c2879b7fc0c81d680745a2a8592e0fdf1cf876ba | |
| parent | b7b4d3426d2b5ecab21578eb20d8e456a1aace8f (diff) | |
mmc: sdhci: Check mrq != NULL in sdhci_tasklet_finish
It seems that under certain circumstances the sdhci_tasklet_finish()
call can be entered with mrq set to NULL, causing the system to crash
with a NULL pointer de-reference.
Seen on S3C6410 system. Based on a patch by Dimitris Papastamos.
Reported-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Cc: <stable@kernel.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
| -rw-r--r-- | drivers/mmc/host/sdhci.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index fd8f488df5f..5d20661bc35 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1334,6 +1334,13 @@ static void sdhci_tasklet_finish(unsigned long param) host = (struct sdhci_host*)param; + /* + * If this tasklet gets rescheduled while running, it will + * be run again afterwards but without any active request. + */ + if (!host->mrq) + return; + spin_lock_irqsave(&host->lock, flags); del_timer(&host->timer); |