project-base/server-skynet-source-3rd-jemalloc
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Fix two quarantine bugs.

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Internal reallocation of the quarantined object array leaked the old array.

Reallocation failure for internal reallocation of the quarantined object
array (very unlikely) resulted in memory corruption.
This commit is contained in:
Jason Evans
2013-01-31 14:42:41 -08:00
parent bbe29d374d
commit d0e942e466
2 changed files with 24 additions and 10 deletions
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29
src/quarantine.c
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@@ -18,6 +18,7 @@ malloc_tsd_data(, quarantine, quarantine_t *, NULL)
/* Function prototypes for non-inline static functions. */
static quarantine_t *quarantine_grow(quarantine_t *quarantine);
static void quarantine_drain_one(quarantine_t *quarantine);
static void quarantine_drain(quarantine_t *quarantine, size_t upper_bound);
/******************************************************************************/
@@ -47,8 +48,10 @@ quarantine_grow(quarantine_t *quarantine)
quarantine_t *ret;
ret = quarantine_init(quarantine->lg_maxobjs + 1);
if (ret == NULL)
if (ret == NULL) {
quarantine_drain_one(quarantine);
return (quarantine);
}
ret->curbytes = quarantine->curbytes;
ret->curobjs = quarantine->curobjs;
@@ -68,23 +71,29 @@ quarantine_grow(quarantine_t *quarantine)
memcpy(&ret->objs[ncopy_a], quarantine->objs, ncopy_b *
sizeof(quarantine_obj_t));
}
idalloc(quarantine);
return (ret);
}
static void
quarantine_drain_one(quarantine_t *quarantine)
{
quarantine_obj_t *obj = &quarantine->objs[quarantine->first];
assert(obj->usize == isalloc(obj->ptr, config_prof));
idalloc(obj->ptr);
quarantine->curbytes -= obj->usize;
quarantine->curobjs--;
quarantine->first = (quarantine->first + 1) & ((ZU(1) <<
quarantine->lg_maxobjs) - 1);
}
static void
quarantine_drain(quarantine_t *quarantine, size_t upper_bound)
{
while (quarantine->curbytes > upper_bound && quarantine->curobjs > 0) {
quarantine_obj_t *obj = &quarantine->objs[quarantine->first];
assert(obj->usize == isalloc(obj->ptr, config_prof));
idalloc(obj->ptr);
quarantine->curbytes -= obj->usize;
quarantine->curobjs--;
quarantine->first = (quarantine->first + 1) & ((ZU(1) <<
quarantine->lg_maxobjs) - 1);
}
while (quarantine->curbytes > upper_bound && quarantine->curobjs > 0)
quarantine_drain_one(quarantine);
}
void