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mov: Fix overflow and error handling in read_tfra().

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Under abnormal conditions the item_count may exceed the max
allocation size on 32-bit systems, this causes the allocated
size to overflow and become too small for the given count.

Additionally, if av_reallocp() fails its allocation, the
fragment_index_count is not correctly decremented.

Ensuring further havoc may be wrought, the error code for
read_tfra() is not checked upon return.

Found-by: Paul Mehta <paul@paulmehta.com>

positive return code and use of _array functions by commiter

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Dale Curtis 2015-01-06 04:00:43 +01:00 committed by Michael Niedermayer
parent a79ac73b63
commit db42d93a61
1 changed files with 21 additions and 15 deletions
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36
libavformat/mov.c
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@ -3823,35 +3823,39 @@ static void export_orphan_timecode(AVFormatContext *s)
static int read_tfra(MOVContext *mov, AVIOContext *f)
{
MOVFragmentIndex* index = NULL;
int version, fieldlength, i, j, err;
int version, fieldlength, i, j;
int64_t pos = avio_tell(f);
uint32_t size = avio_rb32(f);
void *tmp;
if (avio_rb32(f) != MKBETAG('t', 'f', 'r', 'a')) {
return -1;
return 1;
}
av_log(mov->fc, AV_LOG_VERBOSE, "found tfra\n");
index = av_mallocz(sizeof(MOVFragmentIndex));
if (!index) {
return AVERROR(ENOMEM);
}
mov->fragment_index_count++;
if ((err = av_reallocp(&mov->fragment_index_data,
mov->fragment_index_count *
sizeof(MOVFragmentIndex*))) < 0) {
tmp = av_realloc_array(mov->fragment_index_data,
mov->fragment_index_count + 1,
sizeof(MOVFragmentIndex*));
if (!tmp) {
av_freep(&index);
return err;
return AVERROR(ENOMEM);
}
mov->fragment_index_data[mov->fragment_index_count - 1] =
index;
mov->fragment_index_data = tmp;
mov->fragment_index_data[mov->fragment_index_count++] = index;
version = avio_r8(f);
avio_rb24(f);
index->track_id = avio_rb32(f);
fieldlength = avio_rb32(f);
index->item_count = avio_rb32(f);
index->items = av_mallocz(
index->item_count * sizeof(MOVFragmentIndexItem));
index->items = av_mallocz_array(
index->item_count, sizeof(MOVFragmentIndexItem));
if (!index->items) {
index->item_count = 0;
return AVERROR(ENOMEM);
}
for (i = 0; i < index->item_count; i++) {
@ -3905,11 +3909,13 @@ static int mov_read_mfra(MOVContext *c, AVIOContext *f)
av_log(c->fc, AV_LOG_DEBUG, "doesn't look like mfra (tag mismatch)\n");
goto fail;
}
ret = 0;
av_log(c->fc, AV_LOG_VERBOSE, "stream has mfra\n");
while (!read_tfra(c, f)) {
/* Empty */
}
do {
ret = read_tfra(c, f);
if (ret < 0)
goto fail;
} while (!ret);
ret = 0;
fail:
seek_ret = avio_seek(f, original_pos, SEEK_SET);
if (seek_ret < 0) {