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[FFmpeg-devel,06/13] avformat/sbgdec: Check ts_int in genrate_intervals

Message ID 20220918171410.31835-6-michael@niedermayer.cc
State Accepted
Commit 5f529e9147a5c5c8ecf8d5ef0dd569194ce30eed
Headers show
Series [FFmpeg-devel,01/13] avformat/flvdec: Use 64bit for sum_flv_tag_size | expand


Context Check Description
yinshiyou/make_loongarch64 success Make finished
yinshiyou/make_fate_loongarch64 success Make fate finished
andriy/make_x86 success Make finished
andriy/make_fate_x86 success Make fate finished

Commit Message

Michael Niedermayer Sept. 18, 2022, 5:14 p.m. UTC
There is probably a better place to check for this, but better
here than nowhere

Fixes: signed integer overflow: -9223372036824775808 - 86400000000 cannot be represented in type 'long'
Fixes: 50993/clusterfuzz-testcase-minimized-ffmpeg_dem_SBG_fuzzer-6601162580688896

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
 libavformat/sbgdec.c | 2 ++
 1 file changed, 2 insertions(+)
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diff --git a/libavformat/sbgdec.c b/libavformat/sbgdec.c
index 4cd12347e7b..5edb9664cc3 100644
--- a/libavformat/sbgdec.c
+++ b/libavformat/sbgdec.c
@@ -1317,6 +1317,8 @@  static int generate_intervals(void *log, struct sbg_script *s, int sample_rate,
     /* Pseudo event before the first one */
     ev0 = s->events[s->nb_events - 1];
+    if (av_sat_sub64(ev0.ts_int, period) != (uint64_t)ev0.ts_int - period)
+        return AVERROR_INVALIDDATA;
     ev0.ts_int   -= period;
     ev0.ts_trans -= period;
     ev0.ts_next  -= period;