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oggstream: protect against out-of-bounds read

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We need at least 17 bytes of data for a valid flac header

oss-fuzz #6974
This commit is contained in:
Edward Hervey 2018-03-17 06:33:38 +01:00 committed by Edward Hervey
parent 57516c5153
commit 17d5f08316
1 changed files with 3 additions and 0 deletions
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3
ext/ogg/gstoggstream.c
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@ -1050,6 +1050,9 @@ static gboolean
is_header_fLaC (GstOggStream * pad, ogg_packet * packet) is_header_fLaC (GstOggStream * pad, ogg_packet * packet)
{ {
if (pad->n_header_packets_seen == 1) { if (pad->n_header_packets_seen == 1) {
if (packet->bytes < 17)
return FALSE;
pad->granulerate_n = (packet->packet[14] << 12) | pad->granulerate_n = (packet->packet[14] << 12) |
(packet->packet[15] << 4) | ((packet->packet[16] >> 4) & 0xf); (packet->packet[15] << 4) | ((packet->packet[16] >> 4) & 0xf);
} }