diff options
-rw-r--r-- | ChangeLog | 4 | ||||
-rw-r--r-- | bignum.c | 2 |
2 files changed, 5 insertions, 1 deletions
@@ -1,3 +1,7 @@ +Sun Jul 14 00:17:42 2013 Tanaka Akira <akr@fsij.org> + + * bignum.c (big_shift): Avoid signed integer overflow. + Sun Jul 14 00:14:15 2013 Tanaka Akira <akr@fsij.org> * bignum.c (bary_mul_precheck): Use bary_small_lshift or @@ -5283,7 +5283,7 @@ static VALUE big_shift(VALUE x, long n) { if (n < 0) - return big_lshift(x, (unsigned long)-n); + return big_lshift(x, 1+(unsigned long)(-(n+1))); else if (n > 0) return big_rshift(x, (unsigned long)n); return x; |