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[FFmpeg-devel,4/7] avformat/utils: Check dts - (1<<pts_wrap_bits) overflow

Message ID 20210114225116.13486-4-michael@niedermayer.cc
State Accepted
Commit d82ee907d6caafbc1212c4b63ecac2dcd30f23b0
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Series [FFmpeg-devel,1/7] avformat/ads: Check size
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Commit Message

Michael Niedermayer Jan. 14, 2021, 10:51 p.m. UTC
Fixes: signed integer overflow: -9223372036842389247 - 2147483648 cannot be represented in type 'long long'
Fixes: 26910/clusterfuzz-testcase-minimized-ffmpeg_dem_FLV_fuzzer-4845007531671552

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/utils.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Michael Niedermayer Jan. 23, 2021, 12:13 a.m. UTC | #1
On Thu, Jan 14, 2021 at 11:51:13PM +0100, Michael Niedermayer wrote:
> Fixes: signed integer overflow: -9223372036842389247 - 2147483648 cannot be represented in type 'long long'
> Fixes: 26910/clusterfuzz-testcase-minimized-ffmpeg_dem_FLV_fuzzer-4845007531671552
> 
> Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> ---
>  libavformat/utils.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

will apply

[...]
diff mbox series

Patch

diff --git a/libavformat/utils.c b/libavformat/utils.c
index d193f9e85f..bf904ef2c5 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -1251,7 +1251,7 @@  static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
         presentation_delayed = 1;
 
     if (pkt->pts != AV_NOPTS_VALUE && pkt->dts != AV_NOPTS_VALUE &&
-        st->pts_wrap_bits < 63 &&
+        st->pts_wrap_bits < 63 && pkt->dts > INT64_MIN + (1LL << (st->pts_wrap_bits - 1)) &&
         pkt->dts - (1LL << (st->pts_wrap_bits - 1)) > pkt->pts) {
         if (is_relative(st->cur_dts) || pkt->dts - (1LL<<(st->pts_wrap_bits - 1)) > st->cur_dts) {
             pkt->dts -= 1LL << st->pts_wrap_bits;