avcodec/mss3: Check for the rac stream being invalid in rac_normalize()

Fixes: out of array read
Fixes: 15982/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MSA1_fuzzer-5630676251967488
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

diff --git a/libavcodec/mss3.c b/libavcodec/mss3.c
index 21226f908513aed2fef0f56c80ceab18e6a11cfd..02bd3609962f9288e2c84fce26d01545aa0577d8 100644 (file)
--- a/libavcodec/mss3.c
+++ b/libavcodec/mss3.c
@@ -298,6 +298,10 @@ static void rac_normalise(RangeCoder *c)
             c->got_error = 1;
             c->low = 1;
         }
+        if (c->low > c->range) {
+            c->got_error = 1;
+            c->low = 1;
+        }
         if (c->range >= RAC_BOTTOM)
             return;
     }