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| author | Bart Van Assche <bart.vanassche@wdc.com> | 2018-08-09 07:53:38 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-09 10:32:29 +0200 |
| commit | ac89e9c33de32967c046dd8ef07c3ae36e024e98 (patch) | |
| tree | 1978cf4f6346f744e1faed10ebcb5736d2f2970b | |
| parent | d367a6927ffd3cb4af62f450fe11e81dcb8c0297 (diff) | |
| download | linux-stable-ac89e9c33de32967c046dd8ef07c3ae36e024e98.tar.gz linux-stable-ac89e9c33de32967c046dd8ef07c3ae36e024e98.tar.bz2 linux-stable-ac89e9c33de32967c046dd8ef07c3ae36e024e98.zip | |
block: Ensure that a request queue is dissociated from the cgroup controller
commit 24ecc3585348b616993a3c4d6dc2c6b8007e358c upstream.
Several block drivers call alloc_disk() followed by put_disk() if
something fails before device_add_disk() is called without calling
blk_cleanup_queue(). Make sure that also for this scenario a request
queue is dissociated from the cgroup controller. This patch avoids
that loading the parport_pc, paride and pf drivers triggers the
following kernel crash:
BUG: KASAN: null-ptr-deref in pi_init+0x42e/0x580 [paride]
Read of size 4 at addr 0000000000000008 by task modprobe/744
Call Trace:
dump_stack+0x9a/0xeb
kasan_report+0x139/0x350
pi_init+0x42e/0x580 [paride]
pf_init+0x2bb/0x1000 [pf]
do_one_initcall+0x8e/0x405
do_init_module+0xd9/0x2f2
load_module+0x3ab4/0x4700
SYSC_finit_module+0x176/0x1a0
do_syscall_64+0xee/0x2b0
entry_SYSCALL_64_after_hwframe+0x42/0xb7
Reported-by: Alexandru Moise <00moses.alexander00@gmail.com>
Fixes: a063057d7c73 ("block: Fix a race between request queue removal and the block cgroup controller") # v4.17
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Tested-by: Alexandru Moise <00moses.alexander00@gmail.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Cc: Tejun Heo <tj@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Alexandru Moise <00moses.alexander00@gmail.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | block/blk-sysfs.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 94987b1f69e1..96c7dfc04852 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -804,6 +804,21 @@ static void __blk_release_queue(struct work_struct *work) blk_stat_remove_callback(q, q->poll_cb); blk_stat_free_callback(q->poll_cb); + if (!blk_queue_dead(q)) { + /* + * Last reference was dropped without having called + * blk_cleanup_queue(). + */ + WARN_ONCE(blk_queue_init_done(q), + "request queue %p has been registered but blk_cleanup_queue() has not been called for that queue\n", + q); + blk_exit_queue(q); + } + + WARN(blkg_root_lookup(q), + "request queue %p is being released but it has not yet been removed from the blkcg controller\n", + q); + blk_free_queue_stats(q->stats); blk_exit_rl(q, &q->root_rl); |