access violation using af_anequalizer filter

[DiZSl]

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.

[Carl Eugen Hoyos]

Fixed by Paul in 6fbc7f092e7c8d405f3fb38f0b550e12156601c4