git: a76de17715ab - main - linuxkpi: Handle a NULL cache pointer in kmem_cache_destroy()

[Mark Johnston]

The branch main has been updated by markj:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=a76de17715ab689b0b53a1012e22d8a08470b6e4

commit a76de17715ab689b0b53a1012e22d8a08470b6e4
Author:     Mark Johnston <ma...@freebsd.org>
AuthorDate: 2021-10-06 18:45:22 +0000
Commit:     Mark Johnston <ma...@freebsd.org>
CommitDate: 2021-10-06 18:49:39 +0000

    linuxkpi: Handle a NULL cache pointer in kmem_cache_destroy()
    
    This is compatible with Linux, and some driver error paths depend on it.
    
    Reviewed by:    bz, emaste
    MFC after:      1 week
    Sponsored by:   The FreeBSD Foundation
    Differential Revision:  https://reviews.freebsd.org/D32337
---
 sys/compat/linuxkpi/common/src/linux_slab.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sys/compat/linuxkpi/common/src/linux_slab.c 
b/sys/compat/linuxkpi/common/src/linux_slab.c
index 5dbd87b66d1a..e062f0535fda 100644
--- a/sys/compat/linuxkpi/common/src/linux_slab.c
+++ b/sys/compat/linuxkpi/common/src/linux_slab.c
@@ -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();