Commit 6fe04128 authored May 19, 2016 by Felix Fietkau Committed by Johannes Berg May 31, 2016

mac80211: fix fast_tx header alignment



The header field is defined as u8[] but also accessed as struct
ieee80211_hdr. Enforce an alignment of 2 to prevent unnecessary
unaligned accesses, which can be very harmful for performance on many
platforms.

Fixes: e495c247 ("mac80211: extend fast-xmit for more ciphers")
Cc: stable@vger.kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

parent fe7a7c57

net/mac80211/sta_info.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -280,7 +280,7 @@ struct ieee80211_fast_tx {
		u8 sa_offs, da_offs, pn_offs;
		u8 band;
		u8 hdr[30 + 2 + IEEE80211_FAST_XMIT_MAX_IV +
		sizeof(rfc1042_header)];
		sizeof(rfc1042_header)] __aligned(2);

		struct rcu_head rcu_head;
		};