Fixes: use-of-uninitialized-value
Fixes: 
70852/clusterfuzz-testcase-minimized-ffmpeg_IO_DEMUXER_fuzzer-5179190066872320

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavformat/img2dec.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libavformat/img2dec.c b/libavformat/img2dec.c
index 20b1bc31f6a..3389fa818e9 100644
--- a/libavformat/img2dec.c
+++ b/libavformat/img2dec.c
@@ -563,6 +563,7 @@ int ff_img_read_packet(AVFormatContext *s1, AVPacket *pkt)
         }
         goto fail;
     } else {
+        memset(pkt->data + pkt->size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
         s->img_count++;
         s->img_number++;
         s->pts++;
-- 
2.45.2

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