[FFmpeg-devel] [PATCH] avcodec/amr_parser: passthrough if channels is unknown

[Michael Niedermayer]

Fixes: division by 0
Fixes: 39562/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AMRWB_fuzzer-5448834960982016
Fixes: 39589/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AMRWB_fuzzer-6119205334810624

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

diff --git a/libavcodec/amr_parser.c b/libavcodec/amr_parser.c
index 79258d4d0cf..9fb7711fee0 100644
--- a/libavcodec/amr_parser.c
+++ b/libavcodec/amr_parser.c
@@ -62,7 +62,7 @@ static int amr_parse(AVCodecParserContext *s1,
     *poutbuf_size = 0;
     *poutbuf = NULL;
 
-    if (s1->flags & PARSER_FLAG_COMPLETE_FRAMES) {
+    if (s1->flags & PARSER_FLAG_COMPLETE_FRAMES || !avctx->channels) {
         next = buf_size;
     } else {
         int ch, offset = 0;
-- 
2.17.1