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aac: check the maximum number of channels

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Broken bitstreams could report a larger than specified number of
channels and cause outbound writes.

CC:libav-stable@libav.org
This commit is contained in:
Luca Barbato 2013-04-27 18:20:47 +02:00
parent 1b6f84a986
commit a943a132f3
1 changed files with 2 additions and 0 deletions
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2
libavcodec/aacdec.c
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@ -141,6 +141,8 @@ static av_cold int che_configure(AACContext *ac,
enum ChannelPosition che_pos, enum ChannelPosition che_pos,
int type, int id, int *channels) int type, int id, int *channels)
{ {
if (*channels >= MAX_CHANNELS)
return AVERROR_INVALIDDATA;
if (che_pos) { if (che_pos) {
if (!ac->che[type][id]) { if (!ac->che[type][id]) {
if (!(ac->che[type][id] = av_mallocz(sizeof(ChannelElement)))) if (!(ac->che[type][id] = av_mallocz(sizeof(ChannelElement))))