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* random.c (limited_rand): expands to long before shift so that

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the result does not overflow.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@24029 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2009-07-10 17:37:52 +00:00
parent 1dabc36b8f
commit a88589c7d1
2 changed files with 7 additions and 2 deletions
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ChangeLog
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@ -1,3 +1,8 @@
Sat Jul 11 02:37:37 2009 Nobuyoshi Nakada <nobu@ruby-lang.org>
* random.c (limited_rand): expands to long before shift so tha
the result does not overflow.
Sat Jul 11 00:16:27 2009 Nobuyoshi Nakada <nobu@ruby-lang.org>
* random.c (rand_init): got rid of buffer overflow.

4
random.c
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@ -414,8 +414,8 @@ limited_rand(struct MT *mt, unsigned long limit)
retry:
val = 0;
for (i = SIZEOF_LONG/4-1; 0 <= i; i--) {
if (mask >> (i * 32)) {
val |= genrand_int32(mt) << (i * 32);
if ((mask >> (i * 32)) & 0xffffffff) {
val |= (unsigned long)genrand_int32(mt) << (i * 32);
val &= mask;
if (limit < val)
goto retry;