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avcodec/fitsdec: Fix division by 0 in size check

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Fixes: division by zero
Fixes: 15210/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FITS_fuzzer-5746033243455488

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 07ffe94c172041cfb03109b9bb6b8bf577332bda)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-06-13 16:08:03 +02:00
parent 36f8bb1261
commit 91348aa5ba
1 changed files with 1 additions and 1 deletions
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libavcodec/fitsdec.c
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@ -143,7 +143,7 @@ static int fits_read_header(AVCodecContext *avctx, const uint8_t **ptr, FITSHead
size = abs(header->bitpix) >> 3;
for (i = 0; i < header->naxis; i++) {
if (header->naxisn[i] > SIZE_MAX / size) {
if (size && header->naxisn[i] > SIZE_MAX / size) {
av_log(avctx, AV_LOG_ERROR, "unsupported size of FITS image");
return AVERROR_INVALIDDATA;
}