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avcodec/pnm: Check scale

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Fixes: division by zero
Fixes: 22974/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PFM_fuzzer-6270027077779456

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-06-06 17:50:21 +02:00
parent 3e651eeac4
commit 8e21379da1
1 changed files with 1 additions and 1 deletions
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2
libavcodec/pnm.c
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@ -179,7 +179,7 @@ int ff_pnm_decode_header(AVCodecContext *avctx, PNMContext * const s)
if (avctx->pix_fmt == AV_PIX_FMT_GBRPF32) {
pnm_get(s, buf1, sizeof(buf1));
if (av_sscanf(buf1, "%f", &s->scale) != 1) {
if (av_sscanf(buf1, "%f", &s->scale) != 1 || s->scale == 0.0 || !isfinite(s->scale)) {
av_log(avctx, AV_LOG_ERROR, "Invalid scale.\n");
return AVERROR_INVALIDDATA;
}