linux-kernel - Re: [PATCH] twl-core: fix oops while calling twl_i2c

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4EB9C824.5070504@emcraft.com>
Date:	Wed, 09 Nov 2011 04:24:04 +0400
From:	Ilya Yanok <yanok@...raft.com>
To:	Ilya Yanok <yanok@...raft.com>
CC:	linux-kernel@...r.kernel.org, Samuel Ortiz <sameo@...ux.intel.com>
Subject: Re: [PATCH] twl-core: fix oops while calling twl_i2c_* for unbound
 driver

Hi,

this is still unfixed. twl_i2c_{read,write} are exported and can be 
called before driver initialization so we have to check it before 
dereferencing twl_map.

Regards, Ilya.

02.08.2011 1:00, Ilya Yanok wrote:
> Check inuse variable before trying to access twl_map to prevent
> dereferencing of uninitialized variable.
>
> Signed-off-by: Ilya Yanok<yanok@...raft.com>
> ---
>   drivers/mfd/twl-core.c |   16 ++++++++--------
>   1 files changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/mfd/twl-core.c b/drivers/mfd/twl-core.c
> index 01ecfee..c7bc222 100644
> --- a/drivers/mfd/twl-core.c
> +++ b/drivers/mfd/twl-core.c
> @@ -362,13 +362,13 @@ int twl_i2c_write(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes)
>   		pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
>   		return -EPERM;
>   	}
> -	sid = twl_map[mod_no].sid;
> -	twl =&twl_modules[sid];
> -
>   	if (unlikely(!inuse)) {
> -		pr_err("%s: client %d is not initialized\n", DRIVER_NAME, sid);
> +		pr_err("%s: not initialized\n", DRIVER_NAME);
>   		return -EPERM;
>   	}
> +	sid = twl_map[mod_no].sid;
> +	twl =&twl_modules[sid];
> +
>   	mutex_lock(&twl->xfer_lock);
>   	/*
>   	 * [MSG1]: fill the register address data
> @@ -419,13 +419,13 @@ int twl_i2c_read(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes)
>   		pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
>   		return -EPERM;
>   	}
> -	sid = twl_map[mod_no].sid;
> -	twl =&twl_modules[sid];
> -
>   	if (unlikely(!inuse)) {
> -		pr_err("%s: client %d is not initialized\n", DRIVER_NAME, sid);
> +		pr_err("%s: not initialized\n", DRIVER_NAME);
>   		return -EPERM;
>   	}
> +	sid = twl_map[mod_no].sid;
> +	twl =&twl_modules[sid];
> +
>   	mutex_lock(&twl->xfer_lock);
>   	/* [MSG1] fill the register address data */
>   	msg =&twl->xfer_msg[0];

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/