Fix overflow in prng_range().

Add jemalloc_ffs64() and use it instead of jemalloc_ffsl() in prng_range(), since long is not guaranteed to be a 64-bit type.
2016-02-20 23:41:33 -08:00
parent aac93f414e
commit ecae12323d
5 changed files with 40 additions and 6 deletions
--- a/include/jemalloc/internal/prng.h
+++ b/include/jemalloc/internal/prng.h
@@ -64,7 +64,7 @@ prng_range(uint64_t *state, uint64_t range)
 	assert(range > 1);

 	/* Compute the ceiling of lg(range). */
-	lg_range = jemalloc_ffsl(pow2_ceil_u64(range)) - 1;
+	lg_range = jemalloc_ffs64(pow2_ceil_u64(range)) - 1;

 	/* Generate a result in [0..range) via repeated trial. */
 	do {