avcodec/lagarith: Check scale_factor

Fixes: 1425/clusterfuzz-testcase-minimized-6295712339853312

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

diff --git a/libavcodec/lagarith.c b/libavcodec/lagarith.c
index 0444977..1f4afc5 100644 (file)
--- a/libavcodec/lagarith.c
+++ b/libavcodec/lagarith.c
@@ -191,7 +191,9 @@ static int lag_read_prob_header(lag_rac *rac, GetBitContext *gb)
         }
 
         scale_factor++;
-        cumulative_target = 1 << scale_factor;
+        if (scale_factor >= 32U)
+            return AVERROR_INVALIDDATA;
+        cumulative_target = 1U << scale_factor;
 
         if (scaled_cumul_prob > cumulative_target) {
             av_log(rac->avctx, AV_LOG_ERROR,