Hi Greg,
Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> writes:
> On Thu, Mar 07, 2024 at 09:48:13AM +0000, Rui Miguel Silva wrote:
>> If channel for the given node is not found we return null from
>> get_channel_from_mode. Make sure we validate the return pointer
>> before using it in two of the missing places.
>>
>> This was originally reported in [0]:
>> Found by Linux Verification Center (linuxtesting.org) with SVACE.
>>
>> [0] https://lore.kernel.org/all/20240301190425.120605-1-m.lobanov@xxxxxxxxxxxx
>>
>> Fixes: 2870b52bae4c ("greybus: lights: add lights implementation")
>> Reported-by: Mikhail Lobanov <m.lobanov@xxxxxxxxxxxx>
>> Suggested-by: Mikhail Lobanov <m.lobanov@xxxxxxxxxxxx>
>> Suggested-by: Alex Elder <elder@xxxxxxxx>
>> Signed-off-by: Rui Miguel Silva <rmfrfs@xxxxxxxxx>
>> ---
>> drivers/staging/greybus/light.c | 6 +++++-
>> 1 file changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/staging/greybus/light.c b/drivers/staging/greybus/light.c
>> index c6bd86a5335a..6f10b9e2c053 100644
>> --- a/drivers/staging/greybus/light.c
>> +++ b/drivers/staging/greybus/light.c
>> @@ -147,6 +147,9 @@ static int __gb_lights_flash_brightness_set(struct gb_channel *channel)
>> channel = get_channel_from_mode(channel->light,
>> GB_CHANNEL_MODE_TORCH);
>>
>> + if (!channel)
>> + return -EINVAL;
>> +
>> /* For not flash we need to convert brightness to intensity */
>> intensity = channel->intensity_uA.min +
>> (channel->intensity_uA.step * channel->led->brightness);
>> @@ -549,7 +552,8 @@ static int gb_lights_light_v4l2_register(struct gb_light *light)
>> }
>>
>> channel_flash = get_channel_from_mode(light, GB_CHANNEL_MODE_FLASH);
>> - WARN_ON(!channel_flash);
>> + if (WARN_ON(!channel_flash))
>> + return -EINVAL;
>
> We should NOT crash machines just because of this, the WARN_ON() should
> be removed and just properly handle the error please.
Yeah, will move this to a less severe option (dev_err) to make some
noise about this "this should never happen" issue.
Cheers,
Rui
> thanks,
>
> greg k-h
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