[FFmpeg-cvslog] avformat/hls: Check target_duration

[Michael Niedermayer]

ffmpeg | branch: release/4.4 | Michael Niedermayer <michael at niedermayer.cc> | Sun Mar 20 22:54:31 2022 +0100| [79ad18ddbd2f7feee33e24bff02afe4c10928b75] | committer: Michael Niedermayer

avformat/hls: Check target_duration

Fixes: signed integer overflow: 77777777777777 * 1000000 cannot be represented in type 'long long'
Fixes: 45545/clusterfuzz-testcase-minimized-ffmpeg_dem_HLS_fuzzer-6438101247983616

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Steven Liu <lingjiujianke at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit a8fd3f7fab83e1beea1c441e1a2e538e7aa431a5)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=79ad18ddbd2f7feee33e24bff02afe4c10928b75
---

 libavformat/hls.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/libavformat/hls.c b/libavformat/hls.c
index 75209906d3..f2ca4f3443 100644
--- a/libavformat/hls.c
+++ b/libavformat/hls.c
@@ -810,10 +810,16 @@ static int parse_playlist(HLSContext *c, const char *url,
                                &info);
             new_rendition(c, &info, url);
         } else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) {
+            int64_t t;
             ret = ensure_playlist(c, &pls, url);
             if (ret < 0)
                 goto fail;
-            pls->target_duration = strtoll(ptr, NULL, 10) * AV_TIME_BASE;
+            t = strtoll(ptr, NULL, 10);
+            if (t < 0 || t >= INT64_MAX / AV_TIME_BASE) {
+                ret = AVERROR_INVALIDDATA;
+                goto fail;
+            }
+            pls->target_duration = t * AV_TIME_BASE;
         } else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
             uint64_t seq_no;
             ret = ensure_playlist(c, &pls, url);