lagarith: avoid infinite loop in lag_rac_refill()

range == 0 happens with corrupted files CC:libav-stable@libav.org

lagarith: avoid infinite loop in lag_rac_refill()
range == 0 happens with corrupted files CC:libav-stable@libav.org
de6dfa2b · Anton Khirnov · f935aca4 · de6dfa2b
Commit de6dfa2b authored Feb 14, 2013 by Anton Khirnov
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lagarithrac.h libavcodec/lagarithrac.h +3 -0

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--- a/libavcodec/lagarithrac.h
+++ b/libavcodec/lagarithrac.h
@@ -107,6 +107,9 @@ static inline uint8_t lag_get_rac(lag_rac *l)
        l->range -= range_scaled * l->prob[255];
    }

+    if (!l->range)
+        l->range = 0x80;
+
    l->low -= range_scaled * l->prob[val];

    return val;