diff options
| author | Gustavo A. R. Silva <garsilva@embeddedor.com> | 2017-05-25 20:04:55 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2017-06-20 11:30:31 +0300 |
| commit | c00a231ba053a9b0be8d512957b99395b92bc620 (patch) | |
| tree | 382a140ff1e4cc16ead5a76c1ef9bdc510f46831 /drivers/mmc/host | |
| parent | d63c2bf49c0de83e88153da3af9970f68c633257 (diff) | |
| download | linux-c00a231ba053a9b0be8d512957b99395b92bc620.tar.xz | |
mmc: bcm2835: fix potential null pointer dereferences
Null check at line 1165: if (mrq->cmd), implies that mrq->cmd might
be NULL.
Add null checks before dereferencing pointer mrq->cmd in order to avoid
any potential NULL pointer dereference.
Addresses-Coverity-ID: 1408740
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host')
| -rw-r--r-- | drivers/mmc/host/bcm2835.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/mmc/host/bcm2835.c b/drivers/mmc/host/bcm2835.c index 1f343a477b3d..abba9a2a78b8 100644 --- a/drivers/mmc/host/bcm2835.c +++ b/drivers/mmc/host/bcm2835.c @@ -1172,7 +1172,10 @@ static void bcm2835_request(struct mmc_host *mmc, struct mmc_request *mrq) if (mrq->data && !is_power_of_2(mrq->data->blksz)) { dev_err(dev, "unsupported block size (%d bytes)\n", mrq->data->blksz); - mrq->cmd->error = -EINVAL; + + if (mrq->cmd) + mrq->cmd->error = -EINVAL; + mmc_request_done(mmc, mrq); return; } @@ -1194,7 +1197,10 @@ static void bcm2835_request(struct mmc_host *mmc, struct mmc_request *mrq) readl(host->ioaddr + SDCMD) & SDCMD_CMD_MASK, edm); bcm2835_dumpregs(host); - mrq->cmd->error = -EILSEQ; + + if (mrq->cmd) + mrq->cmd->error = -EILSEQ; + bcm2835_finish_request(host); mutex_unlock(&host->mutex); return; @@ -1207,7 +1213,7 @@ static void bcm2835_request(struct mmc_host *mmc, struct mmc_request *mrq) if (!host->use_busy) bcm2835_finish_command(host); } - } else if (bcm2835_send_command(host, mrq->cmd)) { + } else if (mrq->cmd && bcm2835_send_command(host, mrq->cmd)) { if (host->data && host->dma_desc) { /* DMA transfer starts now, PIO starts after irq */ bcm2835_start_dma(host); |