[PATCH 187/270] net/wireless: ipw2200: Fix panic occurring in ipw_handle_promiscuous_tx()

Ben Hutchings ben at decadent.org.uk
Tue Nov 27 15:58:51 UTC 2012


On Mon, 2012-11-26 at 14:57 -0200, Herton Ronaldo Krzesinski wrote:
> 3.5.7u1 -stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Stanislav Yakovlev <stas.yakovlev at gmail.com>
> 
> commit bf11315eeda510ea4fc1a2bf972d8155d31d89b4 upstream.
> 
> The driver does not count space of radiotap fields when allocating skb for
> radiotap packet. This leads to kernel panic with the following call trace:
> 
> ...
> [67607.676067] [<c152f90f>] error_code+0x67/0x6c
> [67607.676067] [<c142f831>] ? skb_put+0x91/0xa0
> [67607.676067] [<f8cf5e5b>] ? ipw_handle_promiscuous_tx+0x16b/0x2d0 [ipw2200]
> [67607.676067] [<f8cf5e5b>] ipw_handle_promiscuous_tx+0x16b/0x2d0 [ipw2200]
> [67607.676067] [<f8cf899b>] ipw_net_hard_start_xmit+0x8b/0x90 [ipw2200]
> [67607.676067] [<f8741c5a>] libipw_xmit+0x55a/0x980 [libipw]
> [67607.676067] [<c143d3e8>] dev_hard_start_xmit+0x218/0x4d0
> ...
> 
> This bug was found by VittGam.
> https://bugzilla.kernel.org/show_bug.cgi?id=43255
> 
> Signed-off-by: Stanislav Yakovlev <stas.yakovlev at gmail.com>
> Signed-off-by: John W. Linville <linville at tuxdriver.com>
> Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>

This is missing from 3.4; it may just need de-fuzzing to apply.

Ben.

> ---
>  drivers/net/wireless/ipw2x00/ipw2200.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/ipw2x00/ipw2200.c b/drivers/net/wireless/ipw2x00/ipw2200.c
> index 0036737..1f2edf2 100644
> --- a/drivers/net/wireless/ipw2x00/ipw2200.c
> +++ b/drivers/net/wireless/ipw2x00/ipw2200.c
> @@ -10470,7 +10470,7 @@ static void ipw_handle_promiscuous_tx(struct ipw_priv *priv,
>  		} else
>  			len = src->len;
>  
> -		dst = alloc_skb(len + sizeof(*rt_hdr), GFP_ATOMIC);
> +		dst = alloc_skb(len + sizeof(*rt_hdr) + sizeof(u16)*2, GFP_ATOMIC);
>  		if (!dst)
>  			continue;
>  

-- 
Ben Hutchings
Never attribute to conspiracy what can adequately be explained by stupidity.
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