linux-kernel - [PATCH] f2fs: fix null reference error when checking end of zone

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Message-ID: <20240704010121epcms2p4cff8b25d976d4a1b820ba18f1eb5aa90@epcms2p4>
Date: Thu, 04 Jul 2024 10:01:21 +0900
From: Daejun Park <daejun7.park@...sung.com>
To: "jaegeuk@...nel.org" <jaegeuk@...nel.org>, "chao@...nel.org"
	<chao@...nel.org>, "daehojeong@...gle.com" <daehojeong@...gle.com>,
	"linux-f2fs-devel@...ts.sourceforge.net"
	<linux-f2fs-devel@...ts.sourceforge.net>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
CC: Daejun Park <daejun7.park@...sung.com>, Seokhwan Kim
	<sukka.kim@...sung.com>, Dongjin Kim <dongjin_.kim@...sung.com>, Yonggil
	Song <yonggil.song@...sung.com>, Jaeyoon Choi <j_yoon.choi@...sung.com>,
	Nayeon Kim <nayeoni.kim@...sung.com>, Siwoo Jung <siu.jung@...sung.com>
Subject: [PATCH] f2fs: fix null reference error when checking end of zone

This patch fixes a potentially null pointer being accessed by
is_end_zone_blkaddr() that checks the last block of a zone
when f2fs is mounted as a single device.

Fixes: e067dc3c6b9c ("f2fs: maintain six open zones for zoned devices")
Signed-off-by: Daejun Park <daejun7.park@...sung.com>
---
 fs/f2fs/data.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index b6dcb3bcaef7..1aa7eefa659c 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -925,6 +925,7 @@ int f2fs_merge_page_bio(struct f2fs_io_info *fio)
 #ifdef CONFIG_BLK_DEV_ZONED
 static bool is_end_zone_blkaddr(struct f2fs_sb_info *sbi, block_t blkaddr)
 {
+	struct block_device *bdev = sbi->sb->s_bdev;
 	int devi = 0;
 
 	if (f2fs_is_multi_device(sbi)) {
@@ -935,8 +936,9 @@ static bool is_end_zone_blkaddr(struct f2fs_sb_info *sbi, block_t blkaddr)
 			return false;
 		}
 		blkaddr -= FDEV(devi).start_blk;
+		bdev = FDEV(devi).bdev;
 	}
-	return bdev_is_zoned(FDEV(devi).bdev) &&
+	return bdev_is_zoned(bdev) &&
 		f2fs_blkz_is_seq(sbi, devi, blkaddr) &&
 		(blkaddr % sbi->blocks_per_blkz == sbi->blocks_per_blkz - 1);
 }
-- 
2.25.1