Re: [PATCH v2 2/2] f2fs: add F2FS_IOC_SET_COMPRESS_OPTION ioctl

[Dan Carpenter]

Hi Daeho,

url:    https://github.com/0day-ci/linux/commits/Daeho-Jeong/f2fs-add-F2FS_IOC_GET_COMPRESS_OPTION-ioctl/20201022-115947
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git dev-test
config: x86_64-randconfig-m001-20201022 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

New smatch warnings:
fs/f2fs/file.c:4011 f2fs_ioc_set_compress_option() error: uninitialized symbol 'ret'.

Old smatch warnings:
fs/f2fs/f2fs.h:2127 dec_valid_block_count() warn: should 'count << 3' be a 64 bit type?
fs/f2fs/file.c:2525 f2fs_ioc_gc_range() warn: inconsistent returns 'sbi->gc_lock'.
fs/f2fs/file.c:2941 f2fs_ioc_flush_device() warn: potential spectre issue 'sbi->devs' [w] (local cap)
fs/f2fs/file.c:2966 f2fs_ioc_flush_device() warn: inconsistent returns 'sbi->gc_lock'.
fs/f2fs/file.c:3305 f2fs_precache_extents() error: uninitialized symbol 'err'.

vim +/ret +4011 fs/f2fs/file.c

d869d11ac39edb Daeho Jeong 2020-10-22  3969  static int f2fs_ioc_set_compress_option(struct file *filp, unsigned long arg)
d869d11ac39edb Daeho Jeong 2020-10-22  3970  {
d869d11ac39edb Daeho Jeong 2020-10-22  3971  	struct inode *inode = file_inode(filp);
d869d11ac39edb Daeho Jeong 2020-10-22  3972  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
d869d11ac39edb Daeho Jeong 2020-10-22  3973  	struct f2fs_comp_option option;
d869d11ac39edb Daeho Jeong 2020-10-22  3974  	int ret;
d869d11ac39edb Daeho Jeong 2020-10-22  3975  
d869d11ac39edb Daeho Jeong 2020-10-22  3976  	if (!f2fs_sb_has_compression(sbi))
d869d11ac39edb Daeho Jeong 2020-10-22  3977  		return -EOPNOTSUPP;
d869d11ac39edb Daeho Jeong 2020-10-22  3978  
d869d11ac39edb Daeho Jeong 2020-10-22  3979  	if (!f2fs_compressed_file(inode))
d869d11ac39edb Daeho Jeong 2020-10-22  3980  		return -EINVAL;
d869d11ac39edb Daeho Jeong 2020-10-22  3981  
d869d11ac39edb Daeho Jeong 2020-10-22  3982  	if (!(filp->f_mode & FMODE_WRITE))
d869d11ac39edb Daeho Jeong 2020-10-22  3983  		return -EBADF;
d869d11ac39edb Daeho Jeong 2020-10-22  3984  
d869d11ac39edb Daeho Jeong 2020-10-22  3985  	if (copy_from_user(&option, (struct f2fs_comp_option __user *)arg,
d869d11ac39edb Daeho Jeong 2020-10-22  3986  				sizeof(option)))
d869d11ac39edb Daeho Jeong 2020-10-22  3987  		return -EFAULT;
d869d11ac39edb Daeho Jeong 2020-10-22  3988  
d869d11ac39edb Daeho Jeong 2020-10-22  3989  	if (option.log_cluster_size < MIN_COMPRESS_LOG_SIZE ||
d869d11ac39edb Daeho Jeong 2020-10-22  3990  			option.log_cluster_size > MAX_COMPRESS_LOG_SIZE ||
d869d11ac39edb Daeho Jeong 2020-10-22  3991  			!f2fs_is_compress_algorithm_ready(option.algorithm))
d869d11ac39edb Daeho Jeong 2020-10-22  3992  		return -EINVAL;
d869d11ac39edb Daeho Jeong 2020-10-22  3993  
d869d11ac39edb Daeho Jeong 2020-10-22  3994  	file_start_write(filp);
d869d11ac39edb Daeho Jeong 2020-10-22  3995  	inode_lock(inode);
d869d11ac39edb Daeho Jeong 2020-10-22  3996  
d869d11ac39edb Daeho Jeong 2020-10-22  3997  	if (f2fs_is_mmap_file(inode) ||
d869d11ac39edb Daeho Jeong 2020-10-22  3998  			get_dirty_pages(inode) || inode->i_size) {
d869d11ac39edb Daeho Jeong 2020-10-22  3999  		ret = -EINVAL;
d869d11ac39edb Daeho Jeong 2020-10-22  4000  		goto out;
d869d11ac39edb Daeho Jeong 2020-10-22  4001  	}
d869d11ac39edb Daeho Jeong 2020-10-22  4002  
d869d11ac39edb Daeho Jeong 2020-10-22  4003  	F2FS_I(inode)->i_compress_algorithm = option.algorithm;
d869d11ac39edb Daeho Jeong 2020-10-22  4004  	F2FS_I(inode)->i_log_cluster_size = option.log_cluster_size;
d869d11ac39edb Daeho Jeong 2020-10-22  4005  	F2FS_I(inode)->i_cluster_size = 1 << option.log_cluster_size;
d869d11ac39edb Daeho Jeong 2020-10-22  4006  	f2fs_mark_inode_dirty_sync(inode, true);


"ret" is uninitialized on the success path.

d869d11ac39edb Daeho Jeong 2020-10-22  4007  out:
d869d11ac39edb Daeho Jeong 2020-10-22  4008  	inode_unlock(inode);
d869d11ac39edb Daeho Jeong 2020-10-22  4009  	file_end_write(filp);
d869d11ac39edb Daeho Jeong 2020-10-22  4010  
d869d11ac39edb Daeho Jeong 2020-10-22 @4011  	return ret;
d869d11ac39edb Daeho Jeong 2020-10-22  4012  }

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