[FFmpeg-cvslog] avcodec/pnmdec: Use unsigned for maxval rescaling
Michael Niedermayer
git at videolan.org
Sun Jul 5 20:50:38 EEST 2020
ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Sat May 16 00:31:23 2020 +0200| [a317af2debd596fd11dc2e487f7cd145a0b985da] | committer: Michael Niedermayer
avcodec/pnmdec: Use unsigned for maxval rescaling
Fixes: signed integer overflow: 65535 * 55335 cannot be represented in type 'int'
Fixes: 21955/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PGMYUV_fuzzer-5669206981083136
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 49459aca47d4803b2188fbf12b758bd2b01e91d7)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a317af2debd596fd11dc2e487f7cd145a0b985da
---
libavcodec/pnmdec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/pnmdec.c b/libavcodec/pnmdec.c
index 4e2045d2b3..836d6fd86b 100644
--- a/libavcodec/pnmdec.c
+++ b/libavcodec/pnmdec.c
@@ -132,7 +132,7 @@ static int pnm_decode_frame(AVCodecContext *avctx, void *data,
init_put_bits(&pb, ptr, linesize);
for(j=0; j<avctx->width * components; j++){
unsigned int c=0;
- int v=0;
+ unsigned v=0;
if(s->type < 4)
while(s->bytestream < s->bytestream_end && (*s->bytestream < '0' || *s->bytestream > '9' ))
s->bytestream++;
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