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gpio: bail out silently on NULL descriptors 

In fdeb8e1547
("gpio: reflect base and ngpio into gpio_device")
assumed that GPIO descriptors are either valid or error
pointers, but gpiod_get_[index_]optional() actually return
NULL descriptors and then all subsequent calls should just
bail out.

Cc: stable@vger.kernel.org
Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Andrew Lunn <andrew@lunn.ch>
Fixes: fdeb8e1547 ("gpio: reflect base and ngpio into gpio_device")
Reported-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2016-05-30 16:48:39 +02:00
parent 8b92e17efe
commit 54d77198fd
1 changed files with 8 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/gpio/gpiolib.c
View File

@ -1367,10 +1367,13 @@ done:
/* /*
* This descriptor validation needs to be inserted verbatim into each * This descriptor validation needs to be inserted verbatim into each
* function taking a descriptor, so we need to use a preprocessor * function taking a descriptor, so we need to use a preprocessor
* macro to avoid endless duplication. * macro to avoid endless duplication. If the desc is NULL it is an
* optional GPIO and calls should just bail out.
*/ */
#define VALIDATE_DESC(desc) do { \ #define VALIDATE_DESC(desc) do { \
if (!desc || !desc->gdev) { \ if (!desc) \
return 0; \
if (!desc->gdev) { \
pr_warn("%s: invalid GPIO\n", __func__); \ pr_warn("%s: invalid GPIO\n", __func__); \
return -EINVAL; \ return -EINVAL; \
} \ } \
@ -1381,7 +1384,9 @@ done:
} } while (0) } } while (0)
#define VALIDATE_DESC_VOID(desc) do { \ #define VALIDATE_DESC_VOID(desc) do { \
if (!desc || !desc->gdev) { \ if (!desc) \
return; \
if (!desc->gdev) { \
pr_warn("%s: invalid GPIO\n", __func__); \ pr_warn("%s: invalid GPIO\n", __func__); \
return; \ return; \
} \ } \