linux-kernel - [PATCH] f2fs: fix to avoid accessing invalid fio in f2fs_allocate_data

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Date:   Thu, 1 Apr 2021 10:10:57 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     <jaegeuk@...nel.org>
CC:     <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>, <chao@...nel.org>,
        Chao Yu <yuchao0@...wei.com>
Subject: [PATCH] f2fs: fix to avoid accessing invalid fio in f2fs_allocate_data_block()

Callers may pass fio parameter with NULL value to f2fs_allocate_data_block(),
so we should make sure accessing fio's field after fio's validation check.

Fixes: f608c38c59c6 ("f2fs: clean up parameter of f2fs_allocate_data_block()")
Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
 fs/f2fs/segment.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index c517e689a9a3..d076ae03b5dc 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -3417,9 +3417,6 @@ void f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
 		f2fs_inode_chksum_set(sbi, page);
 	}
 
-	if (F2FS_IO_ALIGNED(sbi))
-		fio->retry = false;
-
 	if (fio) {
 		struct f2fs_bio_info *io;
 
@@ -3429,6 +3426,9 @@ void f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
 		spin_lock(&io->io_lock);
 		list_add_tail(&fio->list, &io->io_list);
 		spin_unlock(&io->io_lock);
+
+		if (F2FS_IO_ALIGNED(sbi))
+			fio->retry = false;
 	}
 
 	mutex_unlock(&curseg->curseg_mutex);
-- 
2.29.2