linux-kernel - Re: [PATCH wireless-next] brcmsmac: avoid 512 byte stack variable

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Message-ID: <1360268386.27863.2.camel@joe-AO722>
Date:	Thu, 07 Feb 2013 12:19:46 -0800
From:	Joe Perches <joe@...ches.com>
To:	Tim Gardner <tim.gardner@...onical.com>
Cc:	linux-kernel@...r.kernel.org, Brett Rudley <brudley@...adcom.com>,
	Arend van Spriel <arend@...adcom.com>,
	"Franky (Zhenhui) Lin" <frankyl@...adcom.com>,
	Hante Meuleman <meuleman@...adcom.com>,
	"John W. Linville" <linville@...driver.com>,
	Seth Forshee <seth.forshee@...onical.com>,
	Pieter-Paul Giesberts <pieterpg@...adcom.com>,
	Hauke Mehrtens <hauke@...ke-m.de>,
	linux-wireless@...r.kernel.org, brcm80211-dev-list@...adcom.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH wireless-next] brcmsmac: avoid 512 byte stack variable

On Thu, 2013-02-07 at 13:13 -0700, Tim Gardner wrote:
> Dynamically allocate the probe response template which
> avoids potential stack corruption. Observed with smatch:

trivial:

> diff --git a/drivers/net/wireless/brcm80211/brcmsmac/main.c b/drivers/net/wireless/brcm80211/brcmsmac/main.c
[]
> @@ -7408,9 +7408,16 @@ brcms_c_bss_update_probe_resp(struct brcms_c_info *wlc,
[]
> +	prb_resp = kmalloc(BCN_TMPL_LEN, GFP_ATOMIC);
> +	if (!prb_resp) {
> +		wiphy_err(wlc->wiphy, "wl: %s: failed to alloc %u bytes\n",
> +			__func__, BCN_TMPL_LEN);

Please remove the error message.
alloc's don't need specific OOM messages.

The mm subsystem already provides a standardized
message with a dump_stack().


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