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avcodec/bintext: Check input size before allocating the input image 

Fixes: Timeout
Fixes: 9795/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_XBIN_fuzzer-5768631928487936

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 2018-09-12 02:11:00 +02:00
parent 35517e3ca7
commit 8db9097308
1 changed files with 3 additions and 0 deletions
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libavcodec/bintext.c
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@ -146,6 +146,9 @@ static int decode_frame(AVCodecContext *avctx,
const uint8_t *buf_end = buf+buf_size;
int ret;
if ((avctx->width / FONT_WIDTH) * (avctx->height / s->font_height) / 256 > buf_size)
return AVERROR_INVALIDDATA;
s->x = s->y = 0;
if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
return ret;