* [patch] mmc: toshsd: move dereference below check for NULL
@ 2014-11-15 18:56 Dan Carpenter
2014-11-19 10:51 ` Ulf Hansson
0 siblings, 1 reply; 2+ messages in thread
From: Dan Carpenter @ 2014-11-15 18:56 UTC (permalink / raw)
To: Chris Ball, Ondrej Zary; +Cc: Ulf Hansson, linux-mmc, kernel-janitors
We check for NULL pointers after dereferencing so it's too late. Oddly
enough, Smatch misses this code but complains about the caller passing
NULL pointers to this function:
drivers/mmc/host/toshsd.c:389 toshsd_irq()
error: we previously assumed 'host->cmd' could be null (see line 349)
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
diff --git a/drivers/mmc/host/toshsd.c b/drivers/mmc/host/toshsd.c
index edb06d6..4666262 100644
--- a/drivers/mmc/host/toshsd.c
+++ b/drivers/mmc/host/toshsd.c
@@ -206,14 +206,14 @@ static irqreturn_t toshsd_thread_irq(int irq, void *dev_id)
static void toshsd_cmd_irq(struct toshsd_host *host)
{
struct mmc_command *cmd = host->cmd;
- u8 *buf = (u8 *) cmd->resp;
+ u8 *buf;
u16 data;
if (!host->cmd) {
dev_warn(&host->pdev->dev, "Spurious CMD irq\n");
return;
}
-
+ buf = (u8 *)cmd->resp;
host->cmd = NULL;
if (cmd->flags & MMC_RSP_PRESENT && cmd->flags & MMC_RSP_136) {
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [patch] mmc: toshsd: move dereference below check for NULL
2014-11-15 18:56 [patch] mmc: toshsd: move dereference below check for NULL Dan Carpenter
@ 2014-11-19 10:51 ` Ulf Hansson
0 siblings, 0 replies; 2+ messages in thread
From: Ulf Hansson @ 2014-11-19 10:51 UTC (permalink / raw)
To: Dan Carpenter; +Cc: Chris Ball, Ondrej Zary, linux-mmc, kernel-janitors
On 15 November 2014 19:56, Dan Carpenter <dan.carpenter@oracle.com> wrote:
> We check for NULL pointers after dereferencing so it's too late. Oddly
> enough, Smatch misses this code but complains about the caller passing
> NULL pointers to this function:
>
> drivers/mmc/host/toshsd.c:389 toshsd_irq()
> error: we previously assumed 'host->cmd' could be null (see line 349)
>
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Thanks! Applied for next.
Kind regards
Uffe
>
> diff --git a/drivers/mmc/host/toshsd.c b/drivers/mmc/host/toshsd.c
> index edb06d6..4666262 100644
> --- a/drivers/mmc/host/toshsd.c
> +++ b/drivers/mmc/host/toshsd.c
> @@ -206,14 +206,14 @@ static irqreturn_t toshsd_thread_irq(int irq, void *dev_id)
> static void toshsd_cmd_irq(struct toshsd_host *host)
> {
> struct mmc_command *cmd = host->cmd;
> - u8 *buf = (u8 *) cmd->resp;
> + u8 *buf;
> u16 data;
>
> if (!host->cmd) {
> dev_warn(&host->pdev->dev, "Spurious CMD irq\n");
> return;
> }
> -
> + buf = (u8 *)cmd->resp;
> host->cmd = NULL;
>
> if (cmd->flags & MMC_RSP_PRESENT && cmd->flags & MMC_RSP_136) {
^ permalink raw reply [flat|nested] 2+ messages in thread
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2014-11-15 18:56 [patch] mmc: toshsd: move dereference below check for NULL Dan Carpenter
2014-11-19 10:51 ` Ulf Hansson
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