[FFmpeg-devel] [PATCH 4/8] avcodec/ffv1dec: Fix off by 1 error with quant tables

[Michael Niedermayer]

Fixes: assertion failure
Fixes: 28447/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FFV1_fuzzer-5369575948550144

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/ffv1dec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/ffv1dec.c b/libavcodec/ffv1dec.c
index c704373cfe..0a3f425493 100644
--- a/libavcodec/ffv1dec.c
+++ b/libavcodec/ffv1dec.c
@@ -786,7 +786,7 @@ static int read_header(FFV1Context *f)
 
             if (f->version == 2) {
                 int idx = get_symbol(c, state, 0);
-                if (idx > (unsigned)f->quant_table_count) {
+                if (idx >= (unsigned)f->quant_table_count) {
                     av_log(f->avctx, AV_LOG_ERROR,
                            "quant_table_index out of range\n");
                     return AVERROR_INVALIDDATA;
-- 
2.17.1