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| author | Qian Cai <cai@lca.pw> | 2019-04-07 00:59:01 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-04-08 07:23:12 +0200 |
| commit | fcf88917dd435c6a4cb2830cb086ee58605a1d85 (patch) | |
| tree | ec4e3e2411c268134933c6a0fc759f057d42161e | |
| parent | Linux 5.1-rc4 (diff) | |
| download | linux-fcf88917dd435c6a4cb2830cb086ee58605a1d85.tar.xz linux-fcf88917dd435c6a4cb2830cb086ee58605a1d85.zip | |
slab: fix a crash by reading /proc/slab_allocators
The commit 510ded33e075 ("slab: implement slab_root_caches list")
changes the name of the list node within "struct kmem_cache" from "list"
to "root_caches_node", but leaks_show() still use the "list" which
causes a crash when reading /proc/slab_allocators.
You need to have CONFIG_SLAB=y and CONFIG_MEMCG=y to see the problem,
because without MEMCG all slab caches are root caches, and the "list"
node happens to be the right one.
Fixes: 510ded33e075 ("slab: implement slab_root_caches list")
Signed-off-by: Qian Cai <cai@lca.pw>
Reviewed-by: Tobin C. Harding <tobin@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/slab.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/slab.c b/mm/slab.c index 329bfe67f2ca..47a380a486ee 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -4308,7 +4308,8 @@ static void show_symbol(struct seq_file *m, unsigned long address) static int leaks_show(struct seq_file *m, void *p) { - struct kmem_cache *cachep = list_entry(p, struct kmem_cache, list); + struct kmem_cache *cachep = list_entry(p, struct kmem_cache, + root_caches_node); struct page *page; struct kmem_cache_node *n; const char *name; |