This is a note to let you know that I've just added the patch titled
blk-mq: fix race between timeout and CPU hotplug
to the 4.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
blk-mq-fix-race-between-timeout-and-cpu-hotplug.patch
and it can be found in the queue-4.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f054b56c951bf1731ba7314a4c7f1cc0b2977cc9 Mon Sep 17 00:00:00 2001
From: Ming Lei <ming.lei@xxxxxxxxxxxxx>
Date: Tue, 21 Apr 2015 10:00:19 +0800
Subject: blk-mq: fix race between timeout and CPU hotplug
From: Ming Lei <ming.lei@xxxxxxxxxxxxx>
commit f054b56c951bf1731ba7314a4c7f1cc0b2977cc9 upstream.
Firstly during CPU hotplug, even queue is freezed, timeout
handler still may come and access hctx->tags, which may cause
use after free, so this patch deactivates timeout handler
inside CPU hotplug notifier.
Secondly, tags can be shared by more than one queues, so we
have to check if the hctx has been unmapped, otherwise
still use-after-free on tags can be triggered.
Reported-by: Dongsu Park <dongsu.park@xxxxxxxxxxxxxxxx>
Tested-by: Dongsu Park <dongsu.park@xxxxxxxxxxxxxxxx>
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
block/blk-mq.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -675,8 +675,11 @@ static void blk_mq_rq_timer(unsigned lon
data.next = blk_rq_timeout(round_jiffies_up(data.next));
mod_timer(&q->timeout, data.next);
} else {
- queue_for_each_hw_ctx(q, hctx, i)
- blk_mq_tag_idle(hctx);
+ queue_for_each_hw_ctx(q, hctx, i) {
+ /* the hctx may be unmapped, so check it here */
+ if (blk_mq_hw_queue_mapped(hctx))
+ blk_mq_tag_idle(hctx);
+ }
}
}
@@ -2075,9 +2078,16 @@ static int blk_mq_queue_reinit_notify(st
*/
list_for_each_entry(q, &all_q_list, all_q_node)
blk_mq_freeze_queue_start(q);
- list_for_each_entry(q, &all_q_list, all_q_node)
+ list_for_each_entry(q, &all_q_list, all_q_node) {
blk_mq_freeze_queue_wait(q);
+ /*
+ * timeout handler can't touch hw queue during the
+ * reinitialization
+ */
+ del_timer_sync(&q->timeout);
+ }
+
list_for_each_entry(q, &all_q_list, all_q_node)
blk_mq_queue_reinit(q);
Patches currently in stable-queue which might be from ming.lei@xxxxxxxxxxxxx are
queue-4.0/blk-mq-fix-race-between-timeout-and-cpu-hotplug.patch
queue-4.0/blk-mq-fix-cpu-hotplug-handling.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html