From: Christoph Hellwig <hch@lst.de>
Date: Sun, 4 Jun 2023 14:56:49 +0000 (+0200)
Subject: bcache: don't pass a stack address to blkdev_get_by_path
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=13dd58cce8d23692e21c9fad3ca41aa19ecc4c82;p=users%2Fhch%2Fblock.git

bcache: don't pass a stack address to blkdev_get_by_path

sb is just an on-stack pointer that can easily be reused by other calls.
Switch to use the bcache-wide bcache_kobj instead as there is no need to
claim per-bcache device anyway.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
---

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 94b91c45c9e2..4a2aed047aec 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -2560,7 +2560,7 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
 	err = "failed to open device";
 	bdev = blkdev_get_by_path(strim(path),
 				  FMODE_READ|FMODE_WRITE|FMODE_EXCL,
-				  sb, NULL);
+				  bcache_kobj, NULL);
 	if (IS_ERR(bdev)) {
 		if (bdev == ERR_PTR(-EBUSY)) {
 			dev_t dev;