linux-kernel - [PATCH 3.2 010/115] mac80211: avoid excessive stack usage in sta

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Date:	Wed, 27 Apr 2016 01:02:24 +0200
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Arnd Bergmann" <arnd@...db.de>,
	"Johannes Berg" <johannes.berg@...el.com>
Subject: [PATCH 3.2 010/115] mac80211: avoid excessive stack usage in sta_info

3.2.80-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Arnd Bergmann <arnd@...db.de>

commit 0ef049dc1167fe834d0ad5d63f89eddc5c70f6e4 upstream.

When CONFIG_OPTIMIZE_INLINING is set, the sta_info_insert_finish
function consumes more stack than normally, exceeding the
1024 byte limit on ARM:

net/mac80211/sta_info.c: In function 'sta_info_insert_finish':
net/mac80211/sta_info.c:561:1: error: the frame size of 1080 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]

It turns out that there are two functions that put a 'struct station_info'
on the stack: __sta_info_destroy_part2 and sta_info_insert_finish, and
this structure alone requires up to 792 bytes.

Hoping that both are called rarely enough, this replaces the
on-stack structure with a dynamic allocation, which unfortunately
requires some suboptimal error handling for out-of-memory.

The __sta_info_destroy_part2 function is actually affected by the
stack usage twice because it calls cfg80211_del_sta_sinfo(), which
has another instance of struct station_info on its stack.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Fixes: 98b6218388e3 ("mac80211/cfg80211: add station events")
Fixes: 6f7a8d26e266 ("mac80211: send statistics with delete station event")
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
[bwh: Backported to 3.2:
 - There's only one instance to fix
 - Adjust context,indentation
 - Use 'return' instead of 'goto out_err']
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -344,12 +344,16 @@ static int sta_info_finish_insert(struct
 {
 	struct ieee80211_local *local = sta->local;
 	struct ieee80211_sub_if_data *sdata = sta->sdata;
-	struct station_info sinfo;
+	struct station_info *sinfo;
 	unsigned long flags;
 	int err = 0;
 
 	lockdep_assert_held(&local->sta_mtx);
 
+	sinfo = kzalloc(sizeof(struct station_info), GFP_KERNEL);
+	if (!sinfo)
+		return -ENOMEM;
+
 	if (!sta->dummy || dummy_reinsert) {
 		/* notify driver */
 		if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
@@ -397,12 +401,11 @@ static int sta_info_finish_insert(struct
 		ieee80211_sta_debugfs_add(sta);
 		rate_control_add_sta_debugfs(sta);
 
-		memset(&sinfo, 0, sizeof(sinfo));
-		sinfo.filled = 0;
-		sinfo.generation = local->sta_generation;
-		cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
+		sinfo->generation = local->sta_generation;
+		cfg80211_new_sta(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
 	}
 
+	kfree(sinfo);
 	return 0;
 }