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| author | Anand Jain <anand.jain@oracle.com> | 2022-11-10 11:36:29 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-12-02 17:40:06 +0100 |
| commit | 0bdb8f7ef87d534b507142185cd03e02f5e4f0e8 (patch) | |
| tree | 2ed5849636a4d79e63bd455b26b49bd551086953 | |
| parent | 24a37ba2cb6616494f9af585a8d5d251c85c0c38 (diff) | |
| download | linux-0bdb8f7ef87d534b507142185cd03e02f5e4f0e8.tar.gz linux-0bdb8f7ef87d534b507142185cd03e02f5e4f0e8.tar.bz2 linux-0bdb8f7ef87d534b507142185cd03e02f5e4f0e8.zip | |
btrfs: free btrfs_path before copying fspath to userspace
commit 8cf96b409d9b3946ece58ced13f92d0f775b0442 upstream.
btrfs_ioctl_ino_to_path() frees the search path after the userspace copy
from the temp buffer @ipath->fspath. Which potentially can lead to a lock
splat warning.
Fix this by freeing the path before we copy it 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>
| -rw-r--r-- | fs/btrfs/ioctl.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 40760d8e1912..a24f937ba49b 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -3879,6 +3879,8 @@ static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) ipath->fspath->val[i] = rel_ptr; } + btrfs_free_path(path); + path = NULL; ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, ipath->fspath, size); if (ret) { |