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assert that nobody asks for a random number between 0 and -1

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svn:r875
This commit is contained in:
Roger Dingledine 2003-12-03 08:08:07 +00:00
parent f65e871bfd
commit 05b9c35173
1 changed files with 1 additions and 0 deletions
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src/common/crypto.c
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@ -1013,6 +1013,7 @@ int crypto_pseudo_rand_int(unsigned int max) {
unsigned int val; unsigned int val;
unsigned int cutoff; unsigned int cutoff;
assert(max < UINT_MAX); assert(max < UINT_MAX);
assert(max > 0); /* don't div by 0 */
/* We ignore any values that are >= 'cutoff,' to avoid biasing the /* We ignore any values that are >= 'cutoff,' to avoid biasing the
* distribution with clipping at the upper end of unsigned int's * distribution with clipping at the upper end of unsigned int's