4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Coly Li colyli@suse.de
commit 91af8300d9c1d7c6b6a2fd754109e08d4798b8d8 upstream.
In bcache code, sysfs entries are created before all resources get allocated, e.g. allocation thread of a cache set.
There is posibility for NULL pointer deference if a resource is accessed but which is not initialized yet. Indeed Jorg Bornschein catches one on cache set allocation thread and gets a kernel oops.
The reason for this bug is, when bch_bucket_alloc() is called during cache set registration and attaching, ca->alloc_thread is not properly allocated and initialized yet, call wake_up_process() on ca->alloc_thread triggers NULL pointer deference failure. A simple and fast fix is, before waking up ca->alloc_thread, checking whether it is allocated, and only wake up ca->alloc_thread when it is not NULL.
Signed-off-by: Coly Li colyli@suse.de Reported-by: Jorg Bornschein jb@capsec.org Cc: Kent Overstreet kent.overstreet@gmail.com Reviewed-by: Michael Lyle mlyle@lyle.org Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/md/bcache/alloc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/md/bcache/alloc.c +++ b/drivers/md/bcache/alloc.c @@ -406,7 +406,8 @@ long bch_bucket_alloc(struct cache *ca,
finish_wait(&ca->set->bucket_wait, &w); out: - wake_up_process(ca->alloc_thread); + if (ca->alloc_thread) + wake_up_process(ca->alloc_thread);
trace_bcache_alloc(ca, reserve);