linux-kernel - Re: [PATCH] 9p: fix NULL pointer dereferences

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Message-ID: <20180726081727.GA6699@nautica>
Date:   Thu, 26 Jul 2018 10:17:27 +0200
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     Tomas Bortoli <tomasbortoli@...il.com>
Cc:     davem@...emloft.net, v9fs-developer@...ts.sourceforge.net,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller@...glegroups.com
Subject: Re: [PATCH] 9p: fix NULL pointer dereferences

Tomas Bortoli wrote on Thu, Jul 26, 2018:
> In p9_fd_create_tcp() and p9_fd_create_unix() it is possible to get
> a NULL value in the addr parameter. Return -EINVAL in such cases.

Let's refuse that at much higher level, like v9fs_mount() in
fs/9p/vfs_super.c

I can't think of any valid reason for dev_name to be NULL, it's the
target IP or virtio handle.

-- 
Dominique