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avcodec/rawdec: Check bits_per_coded_sample more pedantically for 16bit cases 

Fixes: shift exponent -14 is negative
Fixes: 18335/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RAWVIDEO_fuzzer-5723267192586240

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 2019-10-20 23:02:27 +02:00
parent 6014bcf1b7
commit 5634e20525
1 changed files with 1 additions and 1 deletions
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libavcodec/rawdec.c
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@ -223,7 +223,7 @@ static int raw_decode(AVCodecContext *avctx, void *data, int *got_frame,
FFALIGN(avctx->width, 16),
avctx->height, 1);
} else {
context->is_lt_16bpp = av_get_bits_per_pixel(desc) == 16 && avctx->bits_per_coded_sample && avctx->bits_per_coded_sample < 16;
context->is_lt_16bpp = av_get_bits_per_pixel(desc) == 16 && avctx->bits_per_coded_sample > 8 && avctx->bits_per_coded_sample < 16;
context->frame_size = av_image_get_buffer_size(avctx->pix_fmt, avctx->width,
avctx->height, 1);
}