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mov: don't overwrite existing indexes. 

Prevents all kind of badness if files contain multiple
indexes.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
This commit is contained in:
Ronald S. Bultje 2012-03-28 12:56:07 -07:00
parent 0399fe0fd2
commit 4f7c7624c0
1 changed files with 11 additions and 8 deletions
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19
libavformat/mov.c
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@ -1727,6 +1727,7 @@ static void mov_build_index(MOVContext *mov, AVStream *st)
unsigned int stps_index = 0;
unsigned int i, j;
uint64_t stream_size = 0;
AVIndexEntry *mem;
/* adjust first dts according to edit list */
if (sc->time_offset && mov->time_scale > 0) {
@ -1755,12 +1756,13 @@ static void mov_build_index(MOVContext *mov, AVStream *st)
if (!sc->sample_count)
return;
if (sc->sample_count >= UINT_MAX / sizeof(*st->index_entries))
if (sc->sample_count >= UINT_MAX / sizeof(*st->index_entries) - st->nb_index_entries)
return;
st->index_entries = av_malloc(sc->sample_count*sizeof(*st->index_entries));
if (!st->index_entries)
mem = av_realloc(st->index_entries, (st->nb_index_entries + sc->sample_count) * sizeof(*st->index_entries));
if (!mem)
return;
st->index_entries_allocated_size = sc->sample_count*sizeof(*st->index_entries);
st->index_entries = mem;
st->index_entries_allocated_size = (st->nb_index_entries + sc->sample_count) * sizeof(*st->index_entries);
for (i = 0; i < sc->chunk_count; i++) {
current_offset = sc->chunk_offsets[i];
@ -1844,12 +1846,13 @@ static void mov_build_index(MOVContext *mov, AVStream *st)
}
av_dlog(mov->fc, "chunk count %d\n", total);
if (total >= UINT_MAX / sizeof(*st->index_entries))
if (total >= UINT_MAX / sizeof(*st->index_entries) - st->nb_index_entries)
return;
st->index_entries = av_malloc(total*sizeof(*st->index_entries));
if (!st->index_entries)
mem = av_realloc(st->index_entries, (st->nb_index_entries + total) * sizeof(*st->index_entries));
if (!mem)
return;
st->index_entries_allocated_size = total*sizeof(*st->index_entries);
st->index_entries = mem;
st->index_entries_allocated_size = (st->nb_index_entries + total) * sizeof(*st->index_entries);
// populate index
for (i = 0; i < sc->chunk_count; i++) {