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[next] hwrng: exynos: check for -ve error return from readl_poll_timeout

Message ID 20180112163048.26960-1-colin.king@canonical.com (mailing list archive)
State New, archived
Headers show

Commit Message

Colin King Jan. 12, 2018, 4:30 p.m. UTC 
From: Colin Ian King <colin.king@canonical.com>

Currently, the return from readl_poll_timeout is being assigned to
a u32 and this is being checked for a -ve return which is always
false since a u32 cannot be less than zero.  Fix this by changing
val to an int so that error returns can be correctly detected.

Detected by CoverityScan, CID#1463776 ("Logically dead code")

Fixes: 6cd225cc5d8a ("hwrng: exynos - add Samsung Exynos True RNG driver")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/char/hw_random/exynos-trng.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Krzysztof Kozlowski Jan. 15, 2018, 8:55 a.m. UTC | #1 
On Fri, Jan 12, 2018 at 5:30 PM, Colin King <colin.king@canonical.com> wrote:
> From: Colin Ian King <colin.king@canonical.com>
>
> Currently, the return from readl_poll_timeout is being assigned to
> a u32 and this is being checked for a -ve return which is always
> false since a u32 cannot be less than zero.  Fix this by changing
> val to an int so that error returns can be correctly detected.
>
> Detected by CoverityScan, CID#1463776 ("Logically dead code")
>
> Fixes: 6cd225cc5d8a ("hwrng: exynos - add Samsung Exynos True RNG driver")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
>  drivers/char/hw_random/exynos-trng.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>

Thanks for the patch! Dan already fixed this few days before:
https://www.spinics.net/lists/linux-samsung-soc/msg61724.html

Best regards,
Krzysztof
Lukasz Stelmach Jan. 29, 2018, 1:24 p.m. UTC | #2 
It was <2018-01-12 pią 17:30>, when Colin King wrote:
> From: Colin Ian King <colin.king@canonical.com>
>
> Currently, the return from readl_poll_timeout is being assigned to
> a u32 and this is being checked for a -ve return which is always
> false since a u32 cannot be less than zero.  Fix this by changing
> val to an int so that error returns can be correctly detected.
>
> Detected by CoverityScan, CID#1463776 ("Logically dead code")
>
> Fixes: 6cd225cc5d8a ("hwrng: exynos - add Samsung Exynos True RNG driver")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
>  drivers/char/hw_random/exynos-trng.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/char/hw_random/exynos-trng.c b/drivers/char/hw_random/exynos-trng.c
> index 34d6f51ecbee..f4643e3ec346 100644
> --- a/drivers/char/hw_random/exynos-trng.c
> +++ b/drivers/char/hw_random/exynos-trng.c
> @@ -55,7 +55,7 @@ static int exynos_trng_do_read(struct hwrng *rng, void *data, size_t max,
>  			       bool wait)
>  {
>  	struct exynos_trng_dev *trng;
> -	u32 val;
> +	int val;
>  
>  	max = min_t(size_t, max, (EXYNOS_TRNG_FIFO_LEN * 4));

Fixed.

https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git/commit/?id=a8bc71d4960391f732ec0307ebd69e4a25aaf4d3
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Patch

diff --git a/drivers/char/hw_random/exynos-trng.c b/drivers/char/hw_random/exynos-trng.c
index 34d6f51ecbee..f4643e3ec346 100644
--- a/drivers/char/hw_random/exynos-trng.c
+++ b/drivers/char/hw_random/exynos-trng.c
@@ -55,7 +55,7 @@  static int exynos_trng_do_read(struct hwrng *rng, void *data, size_t max,
 			       bool wait)
 {
 	struct exynos_trng_dev *trng;
-	u32 val;
+	int val;
 
 	max = min_t(size_t, max, (EXYNOS_TRNG_FIFO_LEN * 4));