From: Jesper Juhl <jj@chaosbits.net>
Date: Thu, 12 Apr 2012 20:47:52 +0000 (+0200)
Subject: Btrfs: Make free_ipath() deal gracefully with NULL pointers
X-Git-Tag: v3.4-rc5~6^2~18
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4735fb282830c0966b301dabcccf4753fa6604bb;p=pandora-kernel.git

Btrfs: Make free_ipath() deal gracefully with NULL pointers

Make free_ipath() behave like most other freeing functions in the
kernel and gracefully do nothing when passed a NULL pointer.

Besides this making the bahaviour consistent with functions such as
kfree(), vfree(), btrfs_free_path() etc etc, it also fixes a real NULL
deref issue in fs/btrfs/ioctl.c::btrfs_ioctl_ino_to_path(). In that
function we have this code:

...
        ipath = init_ipath(size, root, path);
        if (IS_ERR(ipath)) {
                ret = PTR_ERR(ipath);
                ipath = NULL;
                goto out;
        }
...
out:
        btrfs_free_path(path);
        free_ipath(ipath);
...

If we ever take the true branch of that 'if' statement we'll end up
passing a NULL pointer to free_ipath() which will subsequently
dereference it and we'll go "Boom" :-(
This patch will avoid that.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
---

Reading git-diff-tree failed