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mdbx: avoid on-stack allocation/chkstk inside mdbx_kill_page().

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3 of 17 for https://github.com/leo-yuriev/libmdbx/issues/43

Change-Id: Icff2d67f84283820fb21932c0d439d645c634d25
This commit is contained in:
Leonid Yuriev 2018-10-13 12:02:17 +03:00
parent 9fae7f92d6
commit 23d2f0fbb5
1 changed files with 4 additions and 2 deletions
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6
src/mdbx.c
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@ -1663,7 +1663,9 @@ static size_t bytes_align2os_bytes(const MDBX_env *env, size_t bytes) {
static void __cold mdbx_kill_page(MDBX_env *env, MDBX_page *mp) {
const size_t len = env->me_psize - PAGEHDRSZ;
void *ptr = (env->me_flags & MDBX_WRITEMAP) ? &mp->mp_data : alloca(len);
void *ptr = (env->me_flags & MDBX_WRITEMAP)
? &mp->mp_data
: (void *)((uint8_t *)env->me_pbuf + env->me_psize);
memset(ptr, 0x6F /* 'o', 111 */, len);
if (ptr != &mp->mp_data)
(void)mdbx_pwrite(env->me_fd, ptr, len,
@ -6474,7 +6476,7 @@ int __cold mdbx_env_open(MDBX_env *env, const char *path, unsigned flags,
size =
tsize + env->me_maxdbs * (sizeof(MDBX_db) + sizeof(MDBX_cursor *) +
sizeof(unsigned) + 1);
if ((env->me_pbuf = mdbx_calloc(1, env->me_psize)) &&
if ((env->me_pbuf = mdbx_calloc(2, env->me_psize)) &&
(txn = mdbx_calloc(1, size))) {
txn->mt_dbs = (MDBX_db *)((char *)txn + tsize);
txn->mt_cursors = (MDBX_cursor **)(txn->mt_dbs + env->me_maxdbs);