Re: [FFmpeg-devel] [PATCH] avutil/hwcontext_drm: Check ioctl in drm_map_frame() for failure

["Rémi Denis-Courmont" <remi@remlab.net>]

Le 20 mai 2024 12:33:41 GMT+03:00, Andreas Rheinhardt <andreas.rheinhardt@outlook.com> a écrit :
>Michael Niedermayer:
>> Fixes: CID1583742 Unchecked return value
>> 
>> Sponsored-by: Sovereign Tech Fund
>> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
>> ---
>>  libavutil/hwcontext_drm.c | 5 ++++-
>>  1 file changed, 4 insertions(+), 1 deletion(-)
>> 
>> diff --git a/libavutil/hwcontext_drm.c b/libavutil/hwcontext_drm.c
>> index 0847db09a08..e080c0597b8 100644
>> --- a/libavutil/hwcontext_drm.c
>> +++ b/libavutil/hwcontext_drm.c
>> @@ -166,7 +166,10 @@ static int drm_map_frame(AVHWFramesContext *hwfc,
>>  #if HAVE_LINUX_DMA_BUF_H
>>          /* We're not checking for errors here because the kernel may not
>>           * support the ioctl, in which case its okay to carry on */
>> -        ioctl(desc->objects[i].fd, DMA_BUF_IOCTL_SYNC, &sync_start);
>> +        if (ioctl(desc->objects[i].fd, DMA_BUF_IOCTL_SYNC, &sync_start) == -1) {
>> +            err = AVERROR(errno);
>> +            goto fail;
>> +        }
>>  #endif
>>      }
>>      map->nb_regions = i;
>
>Did you read the comment above the code?

It looks like this should check the errno value rather than flatly ignoring or not ignoring the error, not that I'd know.
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