[PATCH 5.7 160/204] md-cluster: Fix potential error pointer dereference in resize_bitmaps()

[Greg Kroah-Hartman]

From: Dan Carpenter <dan.carpen...@oracle.com>

[ Upstream commit e8abe1de43dac658dacbd04a4543e0c988a8d386 ]

The error handling calls md_bitmap_free(bitmap) which checks for NULL
but will Oops if we pass an error pointer.  Let's set "bitmap" to NULL
on this error path.

Fixes: afd756286083 ("md-cluster/raid10: resize all the bitmaps before start 
reshape")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
Reviewed-by: Guoqing Jiang <guoqing.ji...@cloud.ionos.com>
Signed-off-by: Song Liu <songliubrav...@fb.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/md/md-cluster.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index 73fd50e779754..d50737ec40394 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -1139,6 +1139,7 @@ static int resize_bitmaps(struct mddev *mddev, sector_t 
newsize, sector_t oldsiz
                bitmap = get_bitmap_from_slot(mddev, i);
                if (IS_ERR(bitmap)) {
                        pr_err("can't get bitmap from slot %d\n", i);
+                       bitmap = NULL;
                        goto out;
                }
                counts = &bitmap->counts;
-- 
2.25.1