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gpio: exar: Fix bad handling for ida_simple_get error path 

[ Upstream commit 333830aa14 ]

The commit 7ecced0934 ("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: 7ecced0934 ("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>
5.4-rM2-2.2.x-imx-squashed
Takashi Iwai 2020-04-29 15:56:54 +02:00 committed by Greg Kroah-Hartman
parent 5242e3850b
commit 750f47a658
1 changed files with 5 additions and 2 deletions
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7
drivers/gpio/gpio-exar.c
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@ -145,8 +145,10 @@ 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;
@ -173,6 +175,7 @@ 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;
}