From: Johannes Berg <johannes@sipsolutions.net>
Date: Mon, 20 Apr 2009 23:36:59 +0000 (+0200)
Subject: mac80211: fix alignment calculation bug
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d1bcb9f1273adee6d2ce5edf84f19409a5cc31b9;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

mac80211: fix alignment calculation bug

When checking whether or not a given frame needs to be
moved to be properly aligned to a 4-byte boundary, we
use & 4 which wasn't intended, this code should check
the lowest two bits.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 5fa7aedd90ed..9776f73c51ad 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1397,7 +1397,7 @@ ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
 		 * mac80211. That also explains the __skb_push()
 		 * below.
 		 */
-		align = (unsigned long)skb->data & 4;
+		align = (unsigned long)skb->data & 3;
 		if (align) {
 			if (WARN_ON(skb_headroom(skb) < 3)) {
 				dev_kfree_skb(skb);