Commit 05b9c351 authored by Roger Dingledine's avatar Roger Dingledine
Browse files

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


svn:r875
parent f65e871b
...@@ -1013,6 +1013,7 @@ int crypto_pseudo_rand_int(unsigned int max) { ...@@ -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
......
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