From: Zhao Heming <heming.zhao@suse.com>
Date: Sun, 27 Sep 2020 05:40:13 +0000 (+0800)
Subject: md/bitmap: fix memory leak of temporary bitmap
X-Git-Tag: v5.8.17~106
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4c4b1a29c3d069280b984406f94fa3c7522c528c;p=thirdparty%2Fkernel%2Fstable.git

md/bitmap: fix memory leak of temporary bitmap

[ Upstream commit 1383b347a8ae4a69c04ae3746e6cb5c8d38e2585 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 95a5f3757fa30..19b2601be3c5e 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1949,6 +1949,7 @@ out:
 }
 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;
@@ -2012,6 +2013,7 @@ 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;
 }
@@ -2615,4 +2617,3 @@ 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 d50737ec40394..afbbc552c3275 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;