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Code Issues Releases Activity

avcodec/pgxdec: Check depth more completely

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Fixes: shift exponent -1 is negative
Fixes: 26107/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PGX_fuzzer-5378790047612928

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-10-08 21:19:14 +02:00
parent 857aba7c45
commit 389b9e9b4f
1 changed files with 3 additions and 3 deletions
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6
libavcodec/pgxdec.c
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@ -133,14 +133,14 @@ static int pgx_decode_frame(AVCodecContext *avctx, void *data,
if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
return ret;
if (depth <= 8) {
if (depth > 0 && depth <= 8) {
avctx->pix_fmt = AV_PIX_FMT_GRAY8;
bpp = 8;
} else if (depth <= 16) {
} else if (depth > 0 && depth <= 16) {
avctx->pix_fmt = AV_PIX_FMT_GRAY16;
bpp = 16;
} else {
av_log(avctx, AV_LOG_ERROR, "Maximum depth of 16 bits supported.\n");
av_log(avctx, AV_LOG_ERROR, "depth %d is invalid or unsupported.\n", depth);
return AVERROR_PATCHWELCOME;
}
if (bytestream2_get_bytes_left(&g) < width * height * (bpp >> 3))