linux-kernel - [PATCH v3 1/2] ubi: fastmap: Don't produce the initial next anchor PEB when fastmap is disabled

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Date:   Tue, 7 Jul 2020 21:41:00 +0800
From:   Zhihao Cheng <chengzhihao1@...wei.com>
To:     <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
CC:     <richard@....at>, <yi.zhang@...wei.com>, <s.hauer@...gutronix.de>
Subject: [PATCH v3 1/2] ubi: fastmap: Don't produce the initial next anchor PEB when fastmap is disabled

Following process triggers a memleak caused by forgetting to release the
initial next anchor PEB (CONFIG_MTD_UBI_FASTMAP is disabled):
1. attach -> __erase_worker -> produce the initial next anchor PEB
2. detach -> ubi_fastmap_close (Do nothing, it should have released the
   initial next anchor PEB)

Don't produce the initial next anchor PEB in __erase_worker() when fastmap
is disabled.

Signed-off-by: Zhihao Cheng <chengzhihao1@...wei.com>
Suggested-by: Sascha Hauer <s.hauer@...gutronix.de>
Fixes: f9c34bb529975fe ("ubi: Fix producing anchor PEBs")
Reported-by: syzbot+d9aab50b1154e3d163f5@...kaller.appspotmail.com
---
 drivers/mtd/ubi/wl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
index 27636063ed1b..42cac572f82d 100644
--- a/drivers/mtd/ubi/wl.c
+++ b/drivers/mtd/ubi/wl.c
@@ -1086,7 +1086,8 @@ static int __erase_worker(struct ubi_device *ubi, struct ubi_work *wl_wrk)
 	if (!err) {
 		spin_lock(&ubi->wl_lock);
 
-		if (!ubi->fm_next_anchor && e->pnum < UBI_FM_MAX_START) {
+		if (!ubi->fm_disabled && !ubi->fm_next_anchor &&
+		    e->pnum < UBI_FM_MAX_START) {
 			/* Abort anchor production, if needed it will be
 			 * enabled again in the wear leveling started below.
 			 */
-- 
2.25.4