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avfilter_get_video_buffer_ref_from_frame: check channel count 

more than 8 channels is not supported and crashes with null pointer dereference

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-12-12 14:09:19 +01:00
parent 0ceca269b6
commit 5a4eb6aa27
1 changed files with 6 additions and 2 deletions
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8
libavfilter/avcodec.c
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@ -92,8 +92,12 @@ AVFilterBufferRef *avfilter_get_video_buffer_ref_from_frame(const AVFrame *frame
AVFilterBufferRef *avfilter_get_audio_buffer_ref_from_frame(const AVFrame *frame,
int perms)
{
AVFilterBufferRef *samplesref =
avfilter_get_audio_buffer_ref_from_arrays((uint8_t **)frame->data, frame->linesize[0], perms,
AVFilterBufferRef *samplesref;
if(av_frame_get_channels(frame) > 8) // libavfilter does not suport more than 8 channels FIXME, remove once libavfilter is fixed
return NULL;
samplesref = avfilter_get_audio_buffer_ref_from_arrays((uint8_t **)frame->data, frame->linesize[0], perms,
frame->nb_samples, frame->format,
av_frame_get_channel_layout(frame));
if (!samplesref)