[FFmpeg-cvslog] asfdec: check avio_skip in asf_read_simple_index
Andreas Cadhalpun
git at videolan.org
Tue Feb 16 18:38:05 CET 2016
ffmpeg | branch: master | Andreas Cadhalpun <andreas.cadhalpun at googlemail.com> | Thu Jan 7 10:22:00 2016 +0100| [e4d1621c6e51c623061676439a55dfab89d330f6] | committer: Luca Barbato
asfdec: check avio_skip in asf_read_simple_index
The loop can be very long, even though the file is very short.
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>
Signed-off-by: Alexandra Hájková <alexandra at khirnov.net>
Signed-off-by: Luca Barbato <lu_zero at gentoo.org>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e4d1621c6e51c623061676439a55dfab89d330f6
---
libavformat/asfdec.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/libavformat/asfdec.c b/libavformat/asfdec.c
index 460df2a..aef61bb 100644
--- a/libavformat/asfdec.c
+++ b/libavformat/asfdec.c
@@ -970,7 +970,7 @@ static int asf_read_simple_index(AVFormatContext *s, const GUIDParseTable *g)
uint64_t interval; // index entry time interval in 100 ns units, usually it's 1s
uint32_t pkt_num, nb_entries;
int32_t prev_pkt_num = -1;
- int i;
+ int i, ret;
uint64_t size = avio_rl64(pb);
// simple index objects should be ordered by stream number, this loop tries to find
@@ -992,7 +992,11 @@ static int asf_read_simple_index(AVFormatContext *s, const GUIDParseTable *g)
nb_entries = avio_rl32(pb);
for (i = 0; i < nb_entries; i++) {
pkt_num = avio_rl32(pb);
- avio_skip(pb, 2);
+ ret = avio_skip(pb, 2);
+ if (ret < 0) {
+ av_log(s, AV_LOG_ERROR, "Skipping failed in asf_read_simple_index.\n");
+ return ret;
+ }
if (prev_pkt_num != pkt_num) {
av_add_index_entry(st, asf->first_packet_offset + asf->packet_size *
pkt_num, av_rescale(interval, i, 10000),
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