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Code Issues Releases Wiki Activity

Fix off-by-one error when calculating new hashtable size

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When calculating the new hashtable bitsize, there was an off-by-one
error that would allow the new bitsize to be larger than maximum allowed
causing assertion failure in the rehash() function.
This commit is contained in:
Ondřej Surý 2020-08-28 09:30:29 +02:00
parent 25d35029eb
commit 78543ad5a7
1 changed files with 3 additions and 4 deletions
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7
lib/dns/rbt.c
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@ -2330,10 +2330,9 @@ inithash(dns_rbt_t *rbt) {
static uint32_t
rehash_bits(dns_rbt_t *rbt, size_t newcount) {
uint32_t oldbits = rbt->hashbits;
uint32_t newbits = oldbits;
uint32_t newbits = rbt->hashbits;
while (newcount >= HASHSIZE(newbits) && newbits <= rbt->maxhashbits) {
while (newcount >= HASHSIZE(newbits) && newbits < rbt->maxhashbits) {
newbits += 1;
}
@ -2380,7 +2379,7 @@ rehash(dns_rbt_t *rbt, uint32_t newbits) {
static void
maybe_rehash(dns_rbt_t *rbt, size_t newcount) {
uint32_t newbits = rehash_bits(rbt, newcount);
if (rbt->hashbits < newbits && newbits <= RBT_HASH_MAX_BITS) {
if (rbt->hashbits < newbits && newbits <= rbt->maxhashbits) {
rehash(rbt, newbits);
}
}