[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <1383162700.21123.11.camel@dcbw.foobar.com>
Date: Wed, 30 Oct 2013 14:51:40 -0500
From: Dan Williams <dcbw@...hat.com>
To: Dan Carpenter <dan.carpenter@...cle.com>
Cc: "John W. Linville" <linville@...driver.com>,
libertas-dev@...ts.infradead.org, linux-wireless@...r.kernel.org,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
kernel-janitors@...r.kernel.org
Subject: Re: [patch v2] libertas: potential oops in debugfs
On Wed, 2013-10-30 at 20:12 +0300, Dan Carpenter wrote:
> If we do a zero size allocation then it will oops. Also we can't be
> sure the user passes us a NUL terminated string so I've added a
> terminator.
>
> This code can only be triggered by root.
>
> Reported-by: Nico Golde <nico@...lde.de>
> Reported-by: Fabian Yamaguchi <fabs@...sec.de>
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Acked-by: Dan Williams <dcbw@...hat.com>
>
> diff --git a/drivers/net/wireless/libertas/debugfs.c b/drivers/net/wireless/libertas/debugfs.c
> index 668dd27..1917348 100644
> --- a/drivers/net/wireless/libertas/debugfs.c
> +++ b/drivers/net/wireless/libertas/debugfs.c
> @@ -913,7 +913,10 @@ static ssize_t lbs_debugfs_write(struct file *f, const char __user *buf,
> char *p2;
> struct debug_data *d = f->private_data;
>
> - pdata = kmalloc(cnt, GFP_KERNEL);
> + if (cnt == 0)
> + return 0;
> +
> + pdata = kmalloc(cnt + 1, GFP_KERNEL);
> if (pdata == NULL)
> return 0;
>
> @@ -922,6 +925,7 @@ static ssize_t lbs_debugfs_write(struct file *f, const char __user *buf,
> kfree(pdata);
> return 0;
> }
> + pdata[cnt] = '\0';
>
> p0 = pdata;
> for (i = 0; i < num_of_items; i++) {
> --
> To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists