Fixes: OOM
Fixes: 
26608/clusterfuzz-testcase-minimized-ffmpeg_dem_APNG_fuzzer-4839491644424192

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

diff --git a/libavformat/apngdec.c b/libavformat/apngdec.c
index 0f1d04a365..4e1d21031f 100644
--- a/libavformat/apngdec.c
+++ b/libavformat/apngdec.c
@@ -138,7 +138,7 @@ static int append_extradata(AVCodecParameters *par, 
AVIOContext *pb, int len)
     par->extradata = new_extradata;
     par->extradata_size = new_size;
 
-    if ((ret = avio_read(pb, par->extradata + previous_size, len)) < 0)
+    if ((ret = ffio_read_size(pb, par->extradata + previous_size, len)) < 0)
         return ret;
 
     return previous_size;
-- 
2.17.1

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