[FFmpeg-devel] [PATCH] avcodec/faxcompr: Check for end of bitstream in decode_group3_1d_line() and decode_group3_2d_line()

[Michael Niedermayer]

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 at niedermayer.cc>
---
 libavcodec/faxcompr.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavcodec/faxcompr.c b/libavcodec/faxcompr.c
index 7bf11d80ca..1fc4aca0b3 100644
--- a/libavcodec/faxcompr.c
+++ b/libavcodec/faxcompr.c
@@ -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) {
@@ -254,6 +256,8 @@ static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb,
     unsigned int offs = 0, run = 0;
 
     while (offs < width) {
+        if (get_bits_left(gb) <= 0)
+            return AVERROR_INVALIDDATA;
         int cmode = get_vlc2(gb, ccitt_group3_2d_vlc.table, 9, 1);
         if (cmode == -1) {
             av_log(avctx, AV_LOG_ERROR, "Incorrect mode VLC\n");
-- 
2.17.1