Patch "dm-delay: fix a race between delay_presuspend and delay_bio" has been added to the 6.1-stable tree

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This is a note to let you know that I've just added the patch titled

    dm-delay: fix a race between delay_presuspend and delay_bio

to the 6.1-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:
     dm-delay-fix-a-race-between-delay_presuspend-and-del.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit ea477583c4ed283187470922a022b385462af2a2
Author: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Date:   Fri Nov 17 18:21:14 2023 +0100

    dm-delay: fix a race between delay_presuspend and delay_bio
    
    [ Upstream commit 6fc45b6ed921dc00dfb264dc08c7d67ee63d2656 ]
    
    In delay_presuspend, we set the atomic variable may_delay and then stop
    the timer and flush pending bios. The intention here is to prevent the
    delay target from re-arming the timer again.
    
    However, this test is racy. Suppose that one thread goes to delay_bio,
    sees that dc->may_delay is one and proceeds; now, another thread executes
    delay_presuspend, it sets dc->may_delay to zero, deletes the timer and
    flushes pending bios. Then, the first thread continues and adds the bio to
    delayed->list despite the fact that dc->may_delay is false.
    
    Fix this bug by changing may_delay's type from atomic_t to bool and
    only access it while holding the delayed_bios_lock mutex. Note that we
    don't have to grab the mutex in delay_resume because there are no bios
    in flight at this point.
    
    Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
    Cc: stable@xxxxxxxxxxxxxxx
    Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/md/dm-delay.c b/drivers/md/dm-delay.c
index 358e870a03a56..5a8ece66ea696 100644
--- a/drivers/md/dm-delay.c
+++ b/drivers/md/dm-delay.c
@@ -32,7 +32,7 @@ struct delay_c {
 	struct work_struct flush_expired_bios;
 	struct list_head delayed_bios;
 	struct task_struct *worker;
-	atomic_t may_delay;
+	bool may_delay;
 
 	struct delay_class read;
 	struct delay_class write;
@@ -235,7 +235,7 @@ static int delay_ctr(struct dm_target *ti, unsigned int argc, char **argv)
 
 	ti->private = dc;
 	INIT_LIST_HEAD(&dc->delayed_bios);
-	atomic_set(&dc->may_delay, 1);
+	dc->may_delay = true;
 	dc->argc = argc;
 
 	ret = delay_class_ctr(ti, &dc->read, argv);
@@ -311,7 +311,7 @@ static int delay_bio(struct delay_c *dc, struct delay_class *c, struct bio *bio)
 	struct dm_delay_info *delayed;
 	unsigned long expires = 0;
 
-	if (!c->delay || !atomic_read(&dc->may_delay))
+	if (!c->delay)
 		return DM_MAPIO_REMAPPED;
 
 	delayed = dm_per_bio_data(bio, sizeof(struct dm_delay_info));
@@ -320,6 +320,10 @@ static int delay_bio(struct delay_c *dc, struct delay_class *c, struct bio *bio)
 	delayed->expires = expires = jiffies + msecs_to_jiffies(c->delay);
 
 	mutex_lock(&delayed_bios_lock);
+	if (unlikely(!dc->may_delay)) {
+		mutex_unlock(&delayed_bios_lock);
+		return DM_MAPIO_REMAPPED;
+	}
 	c->ops++;
 	list_add_tail(&delayed->list, &dc->delayed_bios);
 	mutex_unlock(&delayed_bios_lock);
@@ -336,7 +340,9 @@ static void delay_presuspend(struct dm_target *ti)
 {
 	struct delay_c *dc = ti->private;
 
-	atomic_set(&dc->may_delay, 0);
+	mutex_lock(&delayed_bios_lock);
+	dc->may_delay = false;
+	mutex_unlock(&delayed_bios_lock);
 
 	if (delay_is_fast(dc))
 		flush_delayed_bios_fast(dc, true);
@@ -350,7 +356,7 @@ static void delay_resume(struct dm_target *ti)
 {
 	struct delay_c *dc = ti->private;
 
-	atomic_set(&dc->may_delay, 1);
+	dc->may_delay = true;
 }
 
 static int delay_map(struct dm_target *ti, struct bio *bio)



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