diff options
| author | Anand Jain <anand.jain@oracle.com> | 2022-11-10 11:36:28 +0530 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2022-11-15 17:15:44 +0100 |
| commit | 418ffb9e3cf6c4e2574d3a732b724916684bd133 (patch) | |
| tree | ef749df5d42c51e3b63107ab6e069a7ab37ea3a2 /fs | |
| parent | b740d806166979488e798e41743aaec051f2443f (diff) | |
| download | linux-418ffb9e3cf6c4e2574d3a732b724916684bd133.tar.bz2 | |
btrfs: free btrfs_path before copying inodes to userspace
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/ioctl.c | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 89b8d14cb68c..b595f2c6dfc9 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -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); } - 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; + goto out_loi; } + path = btrfs_alloc_path(); + if (!path) { + ret = -ENOMEM; + 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); |