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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org,
	stable@vger.kernel.org
Cc: Chao Yu <chao@kernel.org>,
	Jaegeuk Kim <jaegeuk@kernel.org>,
	Sasha Levin <sashal@kernel.org>
Subject: [PATCH 6.8 579/715] f2fs: compress: fix to check compress flag w/ .i_sem lock
Date: Sun, 24 Mar 2024 18:32:38 -0400
Message-ID: <20240324223455.1342824-580-sashal@kernel.org>
In-Reply-To: <20240324223455.1342824-1-sashal@kernel.org>
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From: Chao Yu <chao@kernel.org>

[ Upstream commit ea59b12ac69774c08aa95cd5b6100700ea0cce97 ]

It needs to check compress flag w/ .i_sem lock, otherwise, compressed
inode may be disabled after the check condition, it's not needed to
set compress option on non-compress inode.

Fixes: e1e8debec656 ("f2fs: add F2FS_IOC_SET_COMPRESS_OPTION ioctl")
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/f2fs/file.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 1ff1c45e19271..caab20648b951 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -3994,16 +3994,20 @@ static int f2fs_ioc_set_compress_option(struct file *filp, unsigned long arg)
 				sizeof(option)))
 		return -EFAULT;
 
-	if (!f2fs_compressed_file(inode) ||
-			option.log_cluster_size < MIN_COMPRESS_LOG_SIZE ||
-			option.log_cluster_size > MAX_COMPRESS_LOG_SIZE ||
-			option.algorithm >= COMPRESS_MAX)
+	if (option.log_cluster_size < MIN_COMPRESS_LOG_SIZE ||
+		option.log_cluster_size > MAX_COMPRESS_LOG_SIZE ||
+		option.algorithm >= COMPRESS_MAX)
 		return -EINVAL;
 
 	file_start_write(filp);
 	inode_lock(inode);
 
 	f2fs_down_write(&F2FS_I(inode)->i_sem);
+	if (!f2fs_compressed_file(inode)) {
+		ret = -EINVAL;
+		goto out;
+	}
+
 	if (f2fs_is_mmap_file(inode) || get_dirty_pages(inode)) {
 		ret = -EBUSY;
 		goto out;
-- 
2.43.0