linux-kernel - [PATCH 1/1] brcmfmac: fix pmksa->bssid usage

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Date:	Fri,  5 Aug 2016 22:34:18 +0200
From:	Nicolas Iooss <nicolas.iooss_linux@....org>
To:	Arend van Spriel <arend.vanspriel@...adcom.com>,
	Franky Lin <franky.lin@...adcom.com>,
	Hante Meuleman <hante.meuleman@...adcom.com>,
	linux-wireless@...r.kernel.org, brcm80211-dev-list.pdl@...adcom.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Nicolas Iooss <nicolas.iooss_linux@....org>
Subject: [PATCH 1/1] brcmfmac: fix pmksa->bssid usage

The struct cfg80211_pmksa defines its bssid field as:

    const u8 *bssid;

contrary to struct brcmf_pmksa, which uses:

    u8 bssid[ETH_ALEN];

Therefore in brcmf_cfg80211_del_pmksa(), &pmksa->bssid takes the address
of this field (of type u8**), not the one of its content (which would be
u8*).  Remove the & operator to make brcmf_dbg("%pM") and memcmp()
behave as expected.

This bug have been found using a custom static checker (which checks the
usage of %p... attributes at build time).  It has been introduced in
commit 6c404f34f2bd ("brcmfmac: Cleanup pmksa cache handling code"),
which replaced pmksa->bssid by &pmksa->bssid while refactoring the code,
without modifying struct cfg80211_pmksa definition.

Fixes: 6c404f34f2bd ("brcmfmac: Cleanup pmksa cache handling code")
Cc: stable@....kernel.org
Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@....org>
---

scripts/checkpatch.pl reports a warning: "Prefer ether_addr_equal() or
ether_addr_equal_unaligned() over memcmp()".  Because some files in
drivers/net/wireless/broadcom/brcm80211/brcmfmac/ still use memcmp()
to compare addresses and because I do not know whether pmksa->bssid is
always aligned, I did not follow this warning.

 drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
index 2628d5e12c64..aceab77cd95a 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
@@ -3884,11 +3884,11 @@ brcmf_cfg80211_del_pmksa(struct wiphy *wiphy, struct net_device *ndev,
 	if (!check_vif_up(ifp->vif))
 		return -EIO;

-	brcmf_dbg(CONN, "del_pmksa - PMK bssid = %pM\n", &pmksa->bssid);
+	brcmf_dbg(CONN, "del_pmksa - PMK bssid = %pM\n", pmksa->bssid);

 	npmk = le32_to_cpu(cfg->pmk_list.npmk);
 	for (i = 0; i < npmk; i++)
-		if (!memcmp(&pmksa->bssid, &pmk[i].bssid, ETH_ALEN))
+		if (!memcmp(pmksa->bssid, &pmk[i].bssid, ETH_ALEN))
 			break;

 	if ((npmk > 0) && (i < npmk)) {
-- 
2.9.2