| Message ID | 1459381914-2764-1-git-send-email-kamal@canonical.com |
|---|---|
| State | New |
| Headers | show |
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index d7ce93e..eff6144 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -1398,6 +1398,9 @@ static void cache_set_flush(struct closure *cl) struct btree *b; unsigned i; + if (!c) + closure_return(cl); + bch_cache_accounting_destroy(&c->accounting); kobject_put(&c->internal);
This is a note to let you know that I have just added a patch titled bcache: fix cache_set_flush() NULL pointer dereference on OOM to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree which can be found at: http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-4.2.y-queue This patch is scheduled to be released in version 4.2.8-ckt7. If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 4.2.y-ckt tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Kamal ---8<------------------------------------------------------------ From bbe44fdcdaf6ac14021d7a59d60eb81d811193c7 Mon Sep 17 00:00:00 2001 From: Eric Wheeler <git@linux.ewheeler.net> Date: Mon, 7 Mar 2016 15:17:50 -0800 Subject: bcache: fix cache_set_flush() NULL pointer dereference on OOM commit f8b11260a445169989d01df75d35af0f56178f95 upstream. When bch_cache_set_alloc() fails to kzalloc the cache_set, the asyncronous closure handling tries to dereference a cache_set that hadn't yet been allocated inside of cache_set_flush() which is called by __cache_set_unregister() during cleanup. This appears to happen only during an OOM condition on bcache_register. Signed-off-by: Eric Wheeler <bcache@linux.ewheeler.net> Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- drivers/md/bcache/super.c | 3 +++ 1 file changed, 3 insertions(+) -- 2.7.4