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avidec: Make sure a packet is large enough before reading its data

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Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2013-09-28 00:41:31 +03:00
parent 68ff998128
commit 8d07258bb6
1 changed files with 2 additions and 1 deletions
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3
libavformat/avidec.c
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@ -816,7 +816,8 @@ fail:
static int read_gab2_sub(AVStream *st, AVPacket *pkt)
{
if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
if (pkt->size >= 7 &&
!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
uint8_t desc[256];
int score = AVPROBE_SCORE_EXTENSION, ret;
AVIStream *ast = st->priv_data;