[FFmpeg-devel] [PATCH 2/2] avcodec/adpcm: Clip predictor for APC

[Michael Niedermayer]

Fixes: signed integer overflow: -2147483648 - 13 cannot be represented in type 'int'
Fixes: 18893/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ADPCM_IMA_APC_fuzzer-5630760442920960

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/adpcm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/adpcm.c b/libavcodec/adpcm.c
index edf7052636..d3919288b1 100644
--- a/libavcodec/adpcm.c
+++ b/libavcodec/adpcm.c
@@ -140,8 +140,8 @@ static av_cold int adpcm_decode_init(AVCodecContext * avctx)
         break;
     case AV_CODEC_ID_ADPCM_IMA_APC:
         if (avctx->extradata && avctx->extradata_size >= 8) {
-            c->status[0].predictor = AV_RL32(avctx->extradata);
-            c->status[1].predictor = AV_RL32(avctx->extradata + 4);
+            c->status[0].predictor = av_clip_intp2(AV_RL32(avctx->extradata    ), 18);
+            c->status[1].predictor = av_clip_intp2(AV_RL32(avctx->extradata + 4), 18);
         }
         break;
     case AV_CODEC_ID_ADPCM_IMA_WS:
-- 
2.23.0