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[FFmpeg-devel,2/2] avcodec/indeo4: Check for end of bitstream in decode_mb_info()

Message ID 20180702001045.29491-2-michael@niedermayer.cc
State Accepted
Commit 267ba2aa96354c5b6a1ea89b2943fbd7a4893862
Headers show

Commit Message

Michael Niedermayer July 2, 2018, 12:10 a.m. UTC 
Fixes: Timeout
Fixes: 8776/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_INDEO4_fuzzer-5361788798369792

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/indeo4.c | 5 +++++
 1 file changed, 5 insertions(+)
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Patch

diff --git a/libavcodec/indeo4.c b/libavcodec/indeo4.c
index 7dff9db877..15ad6f8afc 100644
--- a/libavcodec/indeo4.c
+++ b/libavcodec/indeo4.c
@@ -492,6 +492,11 @@  static int decode_mb_info(IVI45DecContext *ctx, IVIBandDesc *band,
             mb->b_mv_x   =
             mb->b_mv_y   = 0;
 
+            if (get_bits_left(&ctx->gb) < 1) {
+                av_log(avctx, AV_LOG_ERROR, "Insufficient input for mb info\n");
+                return AVERROR_INVALIDDATA;
+            }
+
             if (get_bits1(&ctx->gb)) {
                 if (ctx->frame_type == IVI4_FRAMETYPE_INTRA) {
                     av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n");