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linuxkpi: Handle a NULL cache pointer in kmem_cache_destroy()

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This is compatible with Linux, and some driver error paths depend on it.

Reviewed by:	bz, emaste
Sponsored by:	The FreeBSD Foundation

(cherry picked from commit a76de17715)
This commit is contained in:
Mark Johnston 2021-10-06 14:45:22 -04:00
parent 16dfe02e38
commit e49d57eecc
1 changed files with 3 additions and 0 deletions
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3
sys/compat/linuxkpi/common/src/linux_slab.c
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@ -193,6 +193,9 @@ lkpi_kmem_cache_free(struct linux_kmem_cache *c, void *m)
void
linux_kmem_cache_destroy(struct linux_kmem_cache *c)
{
if (c == NULL)
return;
if (unlikely(c->cache_flags & SLAB_TYPESAFE_BY_RCU)) {
/* make sure all free callbacks have been called */
rcu_barrier();