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Commit ea212a4a authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: use lock_buffer when changing superblock 



When modifying sb contents, we need to use lock its buffer.

Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 5d909cdb

fs/f2fs/file.c

+4 −0
Original line number Diff line number Diff line
@@ -1591,14 +1591,18 @@ static int f2fs_ioc_get_encryption_pwsalt(struct file *filp, unsigned long arg) 
		return err;



	/* update superblock with uuid */

	lock_buffer(sbi->raw_super_buf);

	generate_random_uuid(sbi->raw_super->encrypt_pw_salt);

	unlock_buffer(sbi->raw_super_buf);



	err = f2fs_commit_super(sbi, false);



	mnt_drop_write_file(filp);

	if (err) {

		/* undo new data */

		lock_buffer(sbi->raw_super_buf);

		memset(sbi->raw_super->encrypt_pw_salt, 0, 16);

		unlock_buffer(sbi->raw_super_buf);

		return err;

	}

got_it: