From: Anand Jain anand.jain@oracle.com
commit 418ffb9e3cf6c4e2574d3a732b724916684bd133 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/btrfs/ioctl.c | 16 +++++++--------- 1 file changed, 7 insertions(+), 9 deletions(-)
--- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -4282,21 +4282,20 @@ static long btrfs_ioctl_logical_to_ino(s 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(s ret = -EFAULT;
out: - btrfs_free_path(path); kvfree(inodes); out_loi: kfree(loi);