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Guard slabcur fetching in extent_util

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Yinan Zhang
2019-10-28 09:24:42 -07:00
parent 4786099a3a
commit bd6e28d6a3
3 changed files with 11 additions and 7 deletions
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3
src/ctl.c
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@@ -3199,7 +3199,8 @@ label_return:
* otherwise their values are undefined.
*
* This API is mainly intended for small class allocations, where extents are
* used as slab.
* used as slab. Note that if the bin the extent belongs to is completely
* full, "(a)" will be NULL.
*
* In case of large class allocations, "(a)" will be NULL, and "(e)" and "(f)"
* will be zero (if stats are enabled; otherwise undefined). The other three

9
src/extent.c
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@@ -2124,7 +2124,12 @@ extent_util_stats_verbose_get(tsdn_t *tsdn, const void *ptr,
} else {
*bin_nfree = *bin_nregs = 0;
}
*slabcur_addr = extent_addr_get(bin->slabcur);
assert(*slabcur_addr != NULL);
extent_t *slab;
if (bin->slabcur != NULL) {
slab = bin->slabcur;
} else {
slab = extent_heap_first(&bin->slabs_nonfull);
}
*slabcur_addr = slab != NULL ? extent_addr_get(slab) : NULL;
malloc_mutex_unlock(tsdn, &bin->lock);
}