linux-kernel - [PATCH] f2fs: fix null page reference in redirty

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Message-Id: <20210105012826.956800-1-daeho43@gmail.com>
Date:   Tue,  5 Jan 2021 10:28:26 +0900
From:   Daeho Jeong <daeho43@...il.com>
To:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, kernel-team@...roid.com
Cc:     Daeho Jeong <daehojeong@...gle.com>,
        Colin Ian King <colin.king@...onical.com>
Subject: [PATCH] f2fs: fix null page reference in redirty_blocks

From: Daeho Jeong <daehojeong@...gle.com>

Fixed null page reference when find_lock_page() fails in
redirty_blocks().

Signed-off-by: Daeho Jeong <daehojeong@...gle.com>
Reported-by: Colin Ian King <colin.king@...onical.com>
Fixes: 5fdb322ff2c2 ("f2fs: add F2FS_IOC_DECOMPRESS_FILE and F2FS_IOC_COMPRESS_FILE")
---
 fs/f2fs/file.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 9e5275716be8..bf6682a52433 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -4060,8 +4060,10 @@ static int redirty_blocks(struct inode *inode, pgoff_t page_idx, int len)
 
 	for (i = 0; i < page_len; i++, redirty_idx++) {
 		page = find_lock_page(mapping, redirty_idx);
-		if (!page)
+		if (!page) {
 			ret = -ENOENT;
+			continue;
+		}
 		set_page_dirty(page);
 		f2fs_put_page(page, 1);
 		f2fs_put_page(page, 0);
-- 
2.29.2.729.g45daf8777d-goog