From 1383b347a8ae4a69c04ae3746e6cb5c8d38e2585 Mon Sep 17 00:00:00 2001
From: Zhao Heming <heming.zhao@suse.com>
Date: Sun, 27 Sep 2020 13:40:13 +0800
Subject: [PATCH] md/bitmap: fix memory leak of temporary bitmap
Git-commit: 1383b347a8ae4a69c04ae3746e6cb5c8d38e2585
Patch-mainline: v5.10-rc1
References: bsc#1163727

Callers of get_bitmap_from_slot() are responsible to free the bitmap.

Suggested-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Signed-off-by: Zhao Heming <heming.zhao@suse.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
---
 drivers/md/md-bitmap.c  | 3 ++-
 drivers/md/md-cluster.c | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index b3f13105659d..200c5d0f08bf 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1950,6 +1950,7 @@ int md_bitmap_load(struct mddev *mddev)
 }
 EXPORT_SYMBOL_GPL(md_bitmap_load);
 
+/* caller need to free returned bitmap with md_bitmap_free() */
 struct bitmap *get_bitmap_from_slot(struct mddev *mddev, int slot)
 {
 	int rv = 0;
@@ -2013,6 +2014,7 @@ int md_bitmap_copy_from_slot(struct mddev *mddev, int slot,
 	md_bitmap_unplug(mddev->bitmap);
 	*low = lo;
 	*high = hi;
+	md_bitmap_free(bitmap);
 
 	return rv;
 }
@@ -2616,4 +2618,3 @@ struct attribute_group md_bitmap_group = {
 	.name = "bitmap",
 	.attrs = md_bitmap_attrs,
 };
-
diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index 0580b51a156a..4aaf4820b6f6 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -1166,6 +1166,7 @@ static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsiz
 			 * can't resize bitmap
 			 */
 			goto out;
+		md_bitmap_free(bitmap);
 	}
 
 	return 0;
-- 
1.8.3.1