[FFmpeg-cvslog] avformat/hls: Use unsigned for iv computation

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Tue Feb  8 00:30:59 2022 +0100| [bf33a384995ac21aa41422c6246ebdc5d9632452] | committer: Michael Niedermayer

avformat/hls: Use unsigned for iv computation

Fixes: signed integer overflow: 9223372036854775748 + 60 cannot be represented in type 'long'
Fixes: 44417/clusterfuzz-testcase-minimized-ffmpeg_dem_HLS_fuzzer-5802443881971712

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>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=bf33a384995ac21aa41422c6246ebdc5d9632452
---

 libavformat/hls.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/hls.c b/libavformat/hls.c
index 44afdaab42..06bc46c23f 100644
--- a/libavformat/hls.c
+++ b/libavformat/hls.c
@@ -914,7 +914,7 @@ static int parse_playlist(HLSContext *c, const char *url,
                 if (has_iv) {
                     memcpy(seg->iv, iv, sizeof(iv));
                 } else {
-                    int64_t seq = pls->start_seq_no + pls->n_segments;
+                    uint64_t seq = pls->start_seq_no + (uint64_t)pls->n_segments;
                     memset(seg->iv, 0, sizeof(seg->iv));
                     AV_WB64(seg->iv + 8, seq);
                 }