[FFmpeg-devel] [PATCH 1/2] avcodec/pgxdec: Fix invalid shift in write_frame_*

[Michael Niedermayer]

Fixes: left shift of negative value -121
Fixes: 23911/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PGX_fuzzer-4986800258154496

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

diff --git a/libavcodec/pgxdec.c b/libavcodec/pgxdec.c
index 93b9f4e7a0..e72ec84152 100644
--- a/libavcodec/pgxdec.c
+++ b/libavcodec/pgxdec.c
@@ -102,7 +102,7 @@ error:
         for (i = 0; i < height; i++) {                                                      \
             PIXEL *line = (PIXEL*)frame->data[0] + i*frame->linesize[0]/sizeof(PIXEL);      \
             for (j = 0; j < width; j++) {                                                   \
-                int val;                                                                    \
+                unsigned val;                                                                    \
                 if (sign)                                                                   \
                     val = (PIXEL)bytestream2_get_ ##suffix(g) + (1 << (depth - 1));         \
                 else                                                                        \
-- 
2.17.1