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authorSteven Rostedt <rostedt@goodmis.org>2013-01-17 12:13:46 -0500
committerPekka Enberg <penberg@kernel.org>2013-07-07 19:19:23 +0300
commitc1e854e924f354657ea2ad08fd7b38aac81c59b1 (patch)
treee8058670390c934dbb835bf5be9b18edab829823 /mm/slob.c
parent345c905d13a4ec9f774b6b4bc038fe4aef26cced (diff)
downloadlwn-c1e854e924f354657ea2ad08fd7b38aac81c59b1.tar.gz
lwn-c1e854e924f354657ea2ad08fd7b38aac81c59b1.zip
slob: Check for NULL pointer before calling ctor()
While doing some code inspection, I noticed that the slob constructor method can be called with a NULL pointer. If memory is tight and slob fails to allocate with slob_alloc() or slob_new_pages() it still calls the ctor() method with a NULL pointer. Looking at the first ctor() method I found, I noticed that it can not handle a NULL pointer (I'm sure others probably can't either): static void sighand_ctor(void *data) { struct sighand_struct *sighand = data; spin_lock_init(&sighand->siglock); init_waitqueue_head(&sighand->signalfd_wqh); } The solution is to only call the ctor() method if allocation succeeded. Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Pekka Enberg <penberg@kernel.org>
Diffstat (limited to 'mm/slob.c')
-rw-r--r--mm/slob.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/slob.c b/mm/slob.c
index f729c46639fa..3d73b3b8fb1d 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -554,7 +554,7 @@ void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node)
flags, node);
}
- if (c->ctor)
+ if (b && c->ctor)
c->ctor(b);
kmemleak_alloc_recursive(b, c->size, 1, c->flags, flags);