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realloc(x, 0) should not return NULL.

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See http://www.open-std.org/jtc1/sc22/wg14/www/docs/summary.htm#dr_400.
Upstream jemalloc issue is opened by emaste at
https://github.com/jemalloc/jemalloc/issues/1629.

Reviewed by:	emaste
PR:	240456
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
DIfferential revision:	https://reviews.freebsd.org/D21632
This commit is contained in:
Konstantin Belousov 2019-09-17 18:36:29 +00:00
parent 55894117b1
commit 0edc114ac0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=352456
1 changed files with 0 additions and 15 deletions
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15
contrib/jemalloc/src/jemalloc.c
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@ -2299,21 +2299,6 @@ je_realloc(void *ptr, size_t size) {
LOG("core.realloc.entry", "ptr: %p, size: %zu\n", ptr, size);
if (unlikely(size == 0)) {
if (ptr != NULL) {
/* realloc(ptr, 0) is equivalent to free(ptr). */
UTRACE(ptr, 0, 0);
tcache_t *tcache;
tsd_t *tsd = tsd_fetch();
if (tsd_reentrancy_level_get(tsd) == 0) {
tcache = tcache_get(tsd);
} else {
tcache = NULL;
}
ifree(tsd, ptr, tcache, true);
LOG("core.realloc.exit", "result: %p", NULL);
return NULL;
}
size = 1;
}