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ffmpeg
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avcodec/faxcompr: Check for end of bitstream in decode_group3_1d_line() and decode_group3_2d_line() 

Fixes: infinite loop
Fixes: 33674/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-4816457818046464

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 2021-04-28 16:58:50 +02:00
parent f0ce023ddb
commit 08d2df4153
1 changed files with 6 additions and 1 deletions
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7
libavcodec/faxcompr.c
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@ -209,6 +209,8 @@ static int decode_group3_1d_line(AVCodecContext *avctx, GetBitContext *gb,
unsigned int run = 0;
unsigned int t;
for (;;) {
if (get_bits_left(gb) <= 0)
return AVERROR_INVALIDDATA;
t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);
run += t;
if (t < 64) {
@ -254,7 +256,10 @@ static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb,
unsigned int offs = 0, run = 0;
while (offs < width) {
int cmode = get_vlc2(gb, ccitt_group3_2d_vlc.table, 9, 1);
int cmode;
if (get_bits_left(gb) <= 0)
return AVERROR_INVALIDDATA;
cmode = get_vlc2(gb, ccitt_group3_2d_vlc.table, 9, 1);
if (cmode == -1) {
av_log(avctx, AV_LOG_ERROR, "Incorrect mode VLC\n");
return AVERROR_INVALIDDATA;