commit b1aecad9eae900b9c3054392994d150d5ae572c5
author Michael Niedermayer <michael@niedermayer.cc> Wed Jan 22 22:11:47 2020
committer Michael Niedermayer <michael@niedermayer.cc> Sun Feb 09 22:33:18 2020
tree a3a7be6e3d0917fb9b3b6900ebf0611748030b1f
parent b8a0be93528187721a2414f66abbc252a258afa3

avcodec/dpcm: Fix integer overflow in AV_CODEC_ID_GREMLIN_DPCM

Fixes: signed integer overflow: -2147479324 + -32568 cannot be represented in type 'int'
Fixes: 20103/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_GREMLIN_DPCM_fuzzer-5667667579240448

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/dpcm.c

diff --git a/libavcodec/dpcm.c b/libavcodec/dpcm.c
index 7d3934e..5958081 100644
--- a/libavcodec/dpcm.c
+++ b/libavcodec/dpcm.c
@@ -367,7 +367,7 @@
         while (output_samples < samples_end) {
             uint8_t n = bytestream2_get_byteu(&gb);
 
-            *output_samples++ = s->sample[idx] += s->array[n];
+            *output_samples++ = s->sample[idx] += (unsigned)s->array[n];
             idx ^= 1;
         }
         }