#8572: access violation using af_anequalizer filter
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Reporter: DiZSl | Type: defect
Status: new | Priority: normal
Component: avfilter | Version: unspecified
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Summary of the bug:
By using a large number of af_anequalizer filters, you can get an error
out of the array range.
The add_filter function in the filter has a comparison error
Now:
static int add_filter(AudioNEqualizerContext *s, AVFilterLink *inlink)
{
equalizer(&s->filters[s->nb_filters], inlink->sample_rate);
if (s->nb_filters >= s->nb_allocated) {
...
Must be:
static int add_filter(AudioNEqualizerContext *s, AVFilterLink *inlink)
{
equalizer(&s->filters[s->nb_filters], inlink->sample_rate);
if (s->nb_filters >= (s->nb_allocated - 1)) {
...
nb_allocated initialized as
s->nb_allocated = 32 * inlink->channels;
If you call the add_filter function more times, you will get an error
because nb_filters is incremented after the above comparison.
Unfortunately I can't send you the patch and the command line to play the
bug because I'm not familiar with the ffmpeg command system.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/8572>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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