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matroskadec: Fix a bug where a pointer was cached to an array that might later move due to a realloc() 

Fixes bug #190
Chromium bug #100492
related to CVE-2011-3893

Signed-off-by: Reinhard Tartler <siretart@tauware.de>

(cherry-picked from commit faaec4676c)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
This commit is contained in:
Chris Evans 2012-01-05 21:19:30 +01:00 committed by Reinhard Tartler
parent 4a94678f1b
commit 1f625431e2
1 changed files with 1 additions and 1 deletions
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2
libavformat/matroskadec.c
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@ -1134,7 +1134,6 @@ static void matroska_convert_tags(AVFormatContext *s)
static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
{
EbmlList *seekhead_list = &matroska->seekhead;
MatroskaSeekhead *seekhead = seekhead_list->elem;
uint32_t level_up = matroska->level_up;
int64_t before_pos = avio_tell(matroska->ctx->pb);
uint32_t saved_id = matroska->current_id;
@ -1147,6 +1146,7 @@ static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
return;
for (i=0; i<seekhead_list->nb_elem; i++) {
MatroskaSeekhead *seekhead = seekhead_list->elem;
int64_t offset = seekhead[i].pos + matroska->segment_start;
if (seekhead[i].pos <= before_pos