From: Chao Yu <chao@kernel.org>
Date: Wed, 5 Apr 2023 14:44:53 +0000 (+0800)
Subject: f2fs: fix to check return value of f2fs_do_truncate_blocks()
X-Git-Tag: v6.2.15~293
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0e8f60bfdc6eed209145b49e57af7fa7f478db55;p=thirdparty%2Fkernel%2Fstable.git

f2fs: fix to check return value of f2fs_do_truncate_blocks()

[ Upstream commit b851ee6ba3cc212641e622ebcf92b950c7bafa07 ]

Otherwise, if truncation on cow_inode failed, remained data may
pollute current transaction of atomic write.

Cc: Daeho Jeong <daehojeong@google.com>
Fixes: a46bebd502fe ("f2fs: synchronize atomic write aborts")
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 23fb9861dba40..de92279a80020 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -2117,7 +2117,11 @@ static int f2fs_ioc_start_atomic_write(struct file *filp, bool truncate)
 		clear_inode_flag(fi->cow_inode, FI_INLINE_DATA);
 	} else {
 		/* Reuse the already created COW inode */
-		f2fs_do_truncate_blocks(fi->cow_inode, 0, true);
+		ret = f2fs_do_truncate_blocks(fi->cow_inode, 0, true);
+		if (ret) {
+			f2fs_up_write(&fi->i_gc_rwsem[WRITE]);
+			goto out;
+		}
 	}
 
 	f2fs_write_inode(inode, NULL);