[PATCH 5.8 175/232] ubi: fastmap: Free fastmap next anchor peb during detach

[Greg Kroah-Hartman]

From: Zhihao Cheng <chengzhihao1@xxxxxxxxxx>

[ Upstream commit c3fc1a3919e35a9d8157ed3ae6fd0a478293ba2c ]

ubi_wl_entry related with the fm_next_anchor PEB is not freed during
detach, which causes a memory leak.
Don't forget to release fm_next_anchor PEB while detaching ubi from
mtd when CONFIG_MTD_UBI_FASTMAP is enabled.

Signed-off-by: Zhihao Cheng <chengzhihao1@xxxxxxxxxx>
Fixes: 4b68bf9a69d22d ("ubi: Select fastmap anchor PEBs considering...")
Signed-off-by: Richard Weinberger <richard@xxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/mtd/ubi/fastmap-wl.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/mtd/ubi/fastmap-wl.c b/drivers/mtd/ubi/fastmap-wl.c
index 83afc00e365a5..28f55f9cf7153 100644
--- a/drivers/mtd/ubi/fastmap-wl.c
+++ b/drivers/mtd/ubi/fastmap-wl.c
@@ -381,6 +381,11 @@ static void ubi_fastmap_close(struct ubi_device *ubi)
 		ubi->fm_anchor = NULL;
 	}
 
+	if (ubi->fm_next_anchor) {
+		return_unused_peb(ubi, ubi->fm_next_anchor);
+		ubi->fm_next_anchor = NULL;
+	}
+
 	if (ubi->fm) {
 		for (i = 0; i < ubi->fm->used_blocks; i++)
 			kfree(ubi->fm->e[i]);
-- 
2.25.1