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avcodec/faxcompr: Check for end of input in cmode == 1 in decode_group3_2d_line()

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Fixes: Infinite loop
Fixes: 35591/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-4503764022198272

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 2021-07-31 21:17:23 +02:00
parent 643b2d49bf
commit f803635c4f
1 changed files with 2 additions and 0 deletions
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2
libavcodec/faxcompr.c
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@ -283,6 +283,8 @@ static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb,
for (k = 0; k < 2; k++) { for (k = 0; k < 2; k++) {
run = 0; run = 0;
for (;;) { for (;;) {
if (get_bits_left(gb) <= 0)
return AVERROR_INVALIDDATA;
t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2); t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);
if (t == -1) { if (t == -1) {
av_log(avctx, AV_LOG_ERROR, "Incorrect code\n"); av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");