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Fix possible hash map corruption when deleting string keys

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Bernhard Schelling 2022-03-21 22:24:10 +09:00 committed by Autechre
parent 47c850c7fd
commit 780fdf721e
1 changed files with 6 additions and 5 deletions
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11
libretro-common/include/array/rhmap.h
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@ -159,16 +159,17 @@ RHMAP__UNUSED static uint32_t rhmap_hash_string(const char* str)
struct rhmap__hdr { size_t len, maxlen; uint32_t *keys; char** key_strs; };
#define RHMAP__HDR(b) (((struct rhmap__hdr *)&(b)[-1])-1)
#define RHMAP__GROW(b, n) (*(void**)(&(b)) = rhmap__grow(RHMAP__HDR(b), (void*)(b), sizeof(*(b)), (size_t)(n)))
#define RHMAP__GROW(b, n) (*(void**)(&(b)) = rhmap__grow((void*)(b), sizeof(*(b)), (size_t)(n)))
#define RHMAP__FIT1(b) ((b) && RHMAP_LEN(b) * 2 <= RHMAP_MAX(b) ? 0 : RHMAP__GROW(b, 0))
RHMAP__UNUSED static void* rhmap__grow(struct rhmap__hdr *old_hdr, void* old_ptr, size_t elem_size, size_t reserve)
RHMAP__UNUSED static void* rhmap__grow(void* old_ptr, size_t elem_size, size_t reserve)
{
struct rhmap__hdr *old_hdr = (old_ptr ? ((struct rhmap__hdr *)((char*)old_ptr-elem_size))-1 : NULL);
struct rhmap__hdr *new_hdr;
char *new_vals;
size_t new_max = (old_ptr ? old_hdr->maxlen * 2 + 1 : 15);
while (new_max && new_max / 2 <= reserve)
if (!(new_max = new_max * 2 + 1))
for (; new_max / 2 <= reserve; new_max = new_max * 2 + 1)
if (new_max == (size_t)-1)
return old_ptr; /* overflow */
new_hdr = (struct rhmap__hdr *)malloc(sizeof(struct rhmap__hdr) + (new_max + 2) * elem_size);
@ -246,7 +247,7 @@ RHMAP__UNUSED static ptrdiff_t rhmap__idx(struct rhmap__hdr* hdr, uint32_t key,
hdr->key_strs[i] = NULL;
while ((key = hdr->keys[i = (i + 1) & hdr->maxlen]) != 0)
{
if ((key = (uint32_t)rhmap__idx(hdr, key, str, 1, 0)) == i) continue;
if ((key = (uint32_t)rhmap__idx(hdr, key, hdr->key_strs[i], 1, 0)) == i) continue;
hdr->len--;
hdr->keys[i] = 0;
free(hdr->key_strs[i]);