From: garsilva@embeddedor.com (Gustavo A. R. Silva)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] mmc: host: fix potential null pointer dereference
Date: Tue, 23 May 2017 18:42:27 -0500 [thread overview]
Message-ID: <20170523234227.GA13018@embeddedgus> (raw)
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
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
---
drivers/mmc/host/bcm2835.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/mmc/host/bcm2835.c b/drivers/mmc/host/bcm2835.c
index 1f343a4..abba9a2 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);
--
2.5.0
next reply other threads:[~2017-05-23 23:42 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-23 23:42 Gustavo A. R. Silva [this message]
2017-05-25 9:12 ` [PATCH] mmc: host: fix potential null pointer dereference Stefan Wahren
2017-05-25 16:46 ` Gustavo A. R. Silva
2017-05-25 17:04 ` [PATCH v2] mmc: bcm2835: fix potential null pointer dereferences Gustavo A. R. Silva
2017-05-29 14:42 ` Ulf Hansson
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