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

[Chris Evans]

ffmpeg | branch: release/0.7 | Chris Evans <cevans at chromium.org> | Thu Jan  5 21:19:30 2012 +0100| [1f625431e2bb9564760fba3ab8077ae07ce7c7a1] | committer: Reinhard Tartler

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 at tauware.de>

(cherry-picked from commit faaec4676cb4c7a2303d50df66c6290bc96a7657)

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=1f625431e2bb9564760fba3ab8077ae07ce7c7a1
---

 libavformat/matroskadec.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index 59dce4f..fad554f 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -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