FAILED: patch "[PATCH] brcmfmac: fix pmksa->bssid usage" failed to apply to 4.4-stable tree

FAILED: patch "[PATCH] brcmfmac: fix pmksa->bssid usage" failed to apply to 4.4-stable tree

[gregkh]

The patch below does not apply to the 4.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

>From 7703773ef1d85b40433902a8da20167331597e4a Mon Sep 17 00:00:00 2001
From: Nicolas Iooss <nicolas.iooss_linux@m4x.org>
Date: Tue, 23 Aug 2016 11:37:17 +0200
Subject: [PATCH] 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.

Replace &pmk[i].bssid with pmk[i].bssid too to make the code clearer,
this change does not affect the semantic.

Fixes: 6c404f34f2bd ("brcmfmac: Cleanup pmksa cache handling code")
Cc: stable@vger.kernel.org
Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@m4x.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
index 2628d5e12c64..201a98016142 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)) {

Re: FAILED: patch "[PATCH] brcmfmac: fix pmksa->bssid usage" failed to apply to 4.4-stable tree

[Greg KH]

On Thu, Oct 20, 2016 at 04:16:35PM +0200, gregkh@linuxfoundation.org wrote:
> 
> The patch below does not apply to the 4.4-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git commit
> id to <stable@vger.kernel.org>.
> 
> thanks,
> 
> greg k-h
> 
> ------------------ original commit in Linus's tree ------------------
> 
> >From 7703773ef1d85b40433902a8da20167331597e4a Mon Sep 17 00:00:00 2001
> From: Nicolas Iooss <nicolas.iooss_linux@m4x.org>
> Date: Tue, 23 Aug 2016 11:37:17 +0200
> Subject: [PATCH] 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.
> 
> Replace &pmk[i].bssid with pmk[i].bssid too to make the code clearer,
> this change does not affect the semantic.
> 
> Fixes: 6c404f34f2bd ("brcmfmac: Cleanup pmksa cache handling code")
> Cc: stable@vger.kernel.org
> Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@m4x.org>
> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

Nevermind, this wasn't for 4.4, sorry for the noise...