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authorMiaohe Lin <linmiaohe@huawei.com>2021-10-18 15:16:02 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-10-18 20:22:03 -1000
commit67823a544414def2a36c212abadb55b23bcda00c (patch)
treeac1b6f9e9e1e589695faa509f501696c636eacac /mm/slub.c
parent9037c57681d25e4dcc442d940d6dbe24dd31f461 (diff)
mm, slub: fix potential use-after-free in slab_debugfs_fops
When sysfs_slab_add failed, we shouldn't call debugfs_slab_add() for s because s will be freed soon. And slab_debugfs_fops will use s later leading to a use-after-free. Link: https://lkml.kernel.org/r/20210916123920.48704-5-linmiaohe@huawei.com Fixes: 64dd68497be7 ("mm: slub: move sysfs slab alloc/free interfaces to debugfs") Signed-off-by: Miaohe Lin <linmiaohe@huawei.com> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Cc: Andrey Konovalov <andreyknvl@gmail.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Bharata B Rao <bharata@linux.ibm.com> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Cc: Faiyaz Mohammed <faiyazm@codeaurora.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Kees Cook <keescook@chromium.org> Cc: Pekka Enberg <penberg@kernel.org> Cc: Roman Gushchin <guro@fb.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/slub.c')
-rw-r--r--mm/slub.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/mm/slub.c b/mm/slub.c
index bf1793fb4ce5..f3df0f04a472 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -4887,13 +4887,15 @@ int __kmem_cache_create(struct kmem_cache *s, slab_flags_t flags)
return 0;
err = sysfs_slab_add(s);
- if (err)
+ if (err) {
__kmem_cache_release(s);
+ return err;
+ }
if (s->flags & SLAB_STORE_USER)
debugfs_slab_add(s);
- return err;
+ return 0;
}
void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, unsigned long caller)