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-rw-r--r--sys/vm/uma_core.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/sys/vm/uma_core.c b/sys/vm/uma_core.c
index 8cbd1216678a..b1762500c147 100644
--- a/sys/vm/uma_core.c
+++ b/sys/vm/uma_core.c
@@ -3171,6 +3171,11 @@ uma_zfree_pcpu_arg(uma_zone_t zone, void *pcpu_item, void *udata)
#ifdef SMP
MPASS(zone->uz_flags & UMA_ZONE_PCPU);
#endif
+
+ /* uma_zfree_pcu_*(..., NULL) does nothing, to match free(9). */
+ if (pcpu_item == NULL)
+ return;
+
item = zpcpu_offset_to_base(pcpu_item);
uma_zfree_arg(zone, item, udata);
}