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BUG/MINOR: tools: fix statistical_prng_range()'s output range

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This function was added by commit 84ebfabf7 ("MINOR: tools: add
statistical_prng_range() to get a random number over a range") but it
contains a bug on the range, since mul32hi() covers the whole input
range, we must pass it range-1. For now it didn't have any impact, but
if used to find an array's index it will cause trouble.

This should be backported to 2.4.
This commit is contained in:
Willy Tarreau 2022-07-18 19:09:55 +02:00
parent 4348232231
commit 03f3049df1
1 changed files with 1 additions and 1 deletions
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include/haproxy/tools.h
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@ -1063,7 +1063,7 @@ static inline unsigned int statistical_prng()
*/
static inline uint statistical_prng_range(uint range)
{
return mul32hi(statistical_prng(), range);
return mul32hi(statistical_prng(), range ? range - 1 : 0);
}
/* Update array <fp> with the character transition <prev> to <curr>. If <prev>