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| author | Michal Kazior <michal@plume.com> | 2019-02-11 10:29:27 +0100 |
|---|---|---|
| committer | Jacek Anaszewski <jacek.anaszewski@gmail.com> | 2019-02-14 22:03:44 +0100 |
| commit | 5ddb0869bfc1bca6cfc592c74c64a026f936638c (patch) | |
| tree | ad600e28f853eb1ea69f3e4c8d2c5ee693897e18 /drivers/leds | |
| parent | 0f85e8498a482cbfdab91fb2d1b81c6c8c1cfd15 (diff) | |
| download | linux-5ddb0869bfc1bca6cfc592c74c64a026f936638c.tar.bz2 | |
leds: lp55xx: fix null deref on firmware load failure
I've stumbled upon a kernel crash and the logs
pointed me towards the lp5562 driver:
> <4>[306013.841294] lp5562 0-0030: Direct firmware load for lp5562 failed with error -2
> <4>[306013.894990] lp5562 0-0030: Falling back to user helper
> ...
> <3>[306073.924886] lp5562 0-0030: firmware request failed
> <1>[306073.939456] Unable to handle kernel NULL pointer dereference at virtual address 00000000
> <4>[306074.251011] PC is at _raw_spin_lock+0x1c/0x58
> <4>[306074.255539] LR is at release_firmware+0x6c/0x138
> ...
After taking a look I noticed firmware_release()
could be called with either NULL or a dangling
pointer.
Fixes: 10c06d178df11 ("leds-lp55xx: support firmware interface")
Signed-off-by: Michal Kazior <michal@plume.com>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Diffstat (limited to 'drivers/leds')
| -rw-r--r-- | drivers/leds/leds-lp55xx-common.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/leds/leds-lp55xx-common.c b/drivers/leds/leds-lp55xx-common.c index 3d79a6380761..723f2f17497a 100644 --- a/drivers/leds/leds-lp55xx-common.c +++ b/drivers/leds/leds-lp55xx-common.c @@ -201,7 +201,7 @@ static void lp55xx_firmware_loaded(const struct firmware *fw, void *context) if (!fw) { dev_err(dev, "firmware request failed\n"); - goto out; + return; } /* handling firmware data is chip dependent */ @@ -214,9 +214,9 @@ static void lp55xx_firmware_loaded(const struct firmware *fw, void *context) mutex_unlock(&chip->lock); -out: /* firmware should be released for other channel use */ release_firmware(chip->fw); + chip->fw = NULL; } static int lp55xx_request_firmware(struct lp55xx_chip *chip) |