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btrfs: free btrfs_path before copying inodes to userspace

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btrfs_ioctl_logical_to_ino() frees the search path after the userspace
copy from the temp buffer @inodes. Which potentially can lead to a lock
splat.

Fix this by freeing the path before we copy @inodes to userspace.

CC: stable@vger.kernel.org # 4.19+
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2022-11-10 11:36:28 +05:30 committed by David Sterba
parent b740d80616
commit 418ffb9e3c
1 changed files with 7 additions and 9 deletions
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16
fs/btrfs/ioctl.c
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@ -4282,21 +4282,20 @@ static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info,
size = min_t(u32, loi->size, SZ_16M);
}
inodes = init_data_container(size);
if (IS_ERR(inodes)) {
ret = PTR_ERR(inodes);
goto out_loi;
}
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
goto out;
}
inodes = init_data_container(size);
if (IS_ERR(inodes)) {
ret = PTR_ERR(inodes);
inodes = NULL;
goto out;
}
ret = iterate_inodes_from_logical(loi->logical, fs_info, path,
inodes, ignore_offset);
btrfs_free_path(path);
if (ret == -EINVAL)
ret = -ENOENT;
if (ret < 0)
@ -4308,7 +4307,6 @@ static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info,
ret = -EFAULT;
out:
btrfs_free_path(path);
kvfree(inodes);
out_loi:
kfree(loi);