Vadim Zhestikov via nginx-devel
September 08, 2023 07:08PM
details: https://hg.nginx.org/njs/rev/78c1ef3eeaa9
branches:
changeset: 2195:78c1ef3eeaa9
user: Vadim Zhestikov <v.zhestikov@f5.com>
date: Fri Sep 08 16:05:24 2023 -0700
description:
Added flat hash overflow check.

diffstat:

src/njs_flathsh.c | 26 ++++++++++++++++----------
1 files changed, 16 insertions(+), 10 deletions(-)

diffs (63 lines):

diff -r f5428bc87159 -r 78c1ef3eeaa9 src/njs_flathsh.c
--- a/src/njs_flathsh.c Thu Sep 07 16:12:40 2023 -0700
+++ b/src/njs_flathsh.c Fri Sep 08 16:05:24 2023 -0700
@@ -87,7 +87,7 @@ struct njs_flathsh_descr_s {
static njs_flathsh_descr_t *njs_flathsh_alloc(njs_flathsh_query_t *fhq,
size_t hash_size, size_t elts_size);
static njs_flathsh_descr_t *njs_expand_elts(njs_flathsh_query_t *fhq,
- njs_flathsh_descr_t *h, uint32_t count);
+ njs_flathsh_descr_t *h);


njs_inline size_t
@@ -204,8 +204,8 @@ njs_flathsh_add_elt(njs_flathsh_t *fh, n
return NULL;
}

- if (njs_slow_path(h->elts_count >= h->elts_size)) {
- h = njs_expand_elts(fhq, fh->slot, h->elts_count + 1);
+ if (njs_slow_path(h->elts_count == h->elts_size)) {
+ h = njs_expand_elts(fhq, h);
if (njs_slow_path(h == NULL)) {
return NULL;
}
@@ -228,26 +228,32 @@ njs_flathsh_add_elt(njs_flathsh_t *fh, n


static njs_flathsh_descr_t *
-njs_expand_elts(njs_flathsh_query_t *fhq, njs_flathsh_descr_t *h,
- uint32_t count)
+njs_expand_elts(njs_flathsh_query_t *fhq, njs_flathsh_descr_t *h)
{
void *chunk;
- size_t size;
- uint32_t new_elts_size, new_hash_size, new_hash_mask, i;
+ size_t size, new_elts_size, new_hash_size;
+ uint32_t new_hash_mask, i;
njs_int_t cell_num;
njs_flathsh_elt_t *elt;
njs_flathsh_descr_t *h_src;

- new_elts_size = h->elts_size * NJS_FLATHSH_ELTS_EXPAND_FACTOR_NUM /
+ new_elts_size = h->elts_size * (size_t) NJS_FLATHSH_ELTS_EXPAND_FACTOR_NUM /
NJS_FLATHSH_ELTS_EXPAND_FACTOR_DENOM;
- new_elts_size = njs_max(count, new_elts_size);

- new_hash_size = h->hash_mask + 1;
+ new_elts_size = njs_max(h->elts_count + 1ul, new_elts_size);
+
+ new_hash_size = h->hash_mask + 1ul;

while (new_hash_size < new_elts_size) {
new_hash_size = 2 * new_hash_size;
}

+ /* Overflow check. */
+
+ if (njs_slow_path(new_hash_size > UINT32_MAX)) {
+ return NULL;
+ }
+
if (new_hash_size != (h->hash_mask + 1)) {

/* Expand both hash table cells and its elts. */
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Subject Author Views Posted

[njs] Added flat hash overflow check.

Vadim Zhestikov via nginx-devel 330 September 08, 2023 07:08PM



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