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brcmsmac: avoid 512 byte stack variable 

Dynamically allocate the probe response template which
avoids potential stack corruption. Observed with smatch:

drivers/net/wireless/brcm80211/brcmsmac/main.c:7412 brcms_c_bss_update_probe_resp()
 warn: 'prb_resp' puts 512 bytes on stack

Cc: Brett Rudley <brudley@broadcom.com>
Cc: Arend van Spriel <arend@broadcom.com>
Cc: "Franky (Zhenhui) Lin" <frankyl@broadcom.com>
Cc: Hante Meuleman <meuleman@broadcom.com>
Cc: "John W. Linville" <linville@tuxdriver.com>
Cc: Seth Forshee <seth.forshee@canonical.com>
Cc: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Cc: Hauke Mehrtens <hauke@hauke-m.de>
Cc: linux-wireless@vger.kernel.org
Cc: brcm80211-dev-list@broadcom.com
Cc: netdev@vger.kernel.org
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Tim Gardner 2013-02-07 13:28:09 -07:00 committed by John W. Linville
parent 708eb54f20
commit 0d61c9177c
1 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/net/wireless/brcm80211/brcmsmac/main.c
View File

@ -7405,9 +7405,13 @@ brcms_c_bss_update_probe_resp(struct brcms_c_info *wlc,
struct brcms_bss_cfg *cfg,
bool suspend)
{
u16 prb_resp[BCN_TMPL_LEN / 2];
u16 *prb_resp;
int len = BCN_TMPL_LEN;
prb_resp = kmalloc(BCN_TMPL_LEN, GFP_ATOMIC);
if (!prb_resp)
return;
/*
* write the probe response to hardware, or save in
* the config structure
@ -7441,6 +7445,8 @@ brcms_c_bss_update_probe_resp(struct brcms_c_info *wlc,
if (suspend)
brcms_c_enable_mac(wlc);
kfree(prb_resp);
}
void brcms_c_update_probe_resp(struct brcms_c_info *wlc, bool suspend)