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| author | Takashi Iwai <tiwai@suse.de> | 2020-04-29 16:56:54 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-06-03 09:19:35 +0300 |
| commit | 5d688e0f09dee3d9d513fe6758376b293d72243e (patch) | |
| tree | 59bae6b4e1de572cd53244e85fb5aec62d780780 | |
| parent | efae52019b283fa48ed05f23a5cdd278e7be2984 (diff) | |
| download | linux-5d688e0f09dee3d9d513fe6758376b293d72243e.tar.xz | |
gpio: exar: Fix bad handling for ida_simple_get error path
[ Upstream commit 333830aa149a87cabeb5d30fbcf12eecc8040d2c ]
The commit 7ecced0934e5 ("gpio: exar: add a check for the return value
of ida_simple_get fails") added a goto jump to the common error
handler for ida_simple_get() error, but this is wrong in two ways:
it doesn't set the proper return code and, more badly, it invokes
ida_simple_remove() with a negative index that shall lead to a kernel
panic via BUG_ON().
This patch addresses those two issues.
Fixes: 7ecced0934e5 ("gpio: exar: add a check for the return value of ida_simple_get fails")
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/gpio/gpio-exar.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/gpio/gpio-exar.c b/drivers/gpio/gpio-exar.c index a09d2f9ebacc..695c19901eff 100644 --- a/drivers/gpio/gpio-exar.c +++ b/drivers/gpio/gpio-exar.c @@ -148,8 +148,10 @@ static int gpio_exar_probe(struct platform_device *pdev) mutex_init(&exar_gpio->lock); index = ida_simple_get(&ida_index, 0, 0, GFP_KERNEL); - if (index < 0) - goto err_destroy; + if (index < 0) { + ret = index; + goto err_mutex_destroy; + } sprintf(exar_gpio->name, "exar_gpio%d", index); exar_gpio->gpio_chip.label = exar_gpio->name; @@ -176,6 +178,7 @@ static int gpio_exar_probe(struct platform_device *pdev) err_destroy: ida_simple_remove(&ida_index, index); +err_mutex_destroy: mutex_destroy(&exar_gpio->lock); return ret; } |