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MMC: meson: avoid possible NULL dereference 

No actual segmentation faults were observed but the coding is
at least inconsistent.

irqreturn_t meson_mmc_irq():

We should not dereference host before checking it.

meson_mmc_irq_thread():

If cmd or mrq are NULL we should not dereference them after
writing a warning.

Fixes: 51c5d8447b MMC: meson: initial support for GX platforms
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Acked-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Heinrich Schuchardt 2016-12-23 16:01:08 +01:00 committed by Ulf Hansson
parent a121103c92
commit 19a91dd4e3
1 changed files with 5 additions and 3 deletions
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8
drivers/mmc/host/meson-gx-mmc.c
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@ -578,13 +578,15 @@ static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
{
struct meson_host *host = dev_id;
struct mmc_request *mrq;
struct mmc_command *cmd = host->cmd;
struct mmc_command *cmd;
u32 irq_en, status, raw_status;
irqreturn_t ret = IRQ_HANDLED;
if (WARN_ON(!host))
return IRQ_NONE;
cmd = host->cmd;
mrq = host->mrq;
if (WARN_ON(!mrq))
@ -670,10 +672,10 @@ static irqreturn_t meson_mmc_irq_thread(int irq, void *dev_id)
int ret = IRQ_HANDLED;
if (WARN_ON(!mrq))
ret = IRQ_NONE;
return IRQ_NONE;
if (WARN_ON(!cmd))
ret = IRQ_NONE;
return IRQ_NONE;
data = cmd->data;
if (data) {