Patchwork net: use NLMSG_DEFAULT_SIZE in nlmsg_new() allocations

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Submitter Pablo Neira
Date May 19, 2009, 3:58 p.m.
Message ID <20090519155820.27716.47419.stgit@Decadence>
Download mbox | patch
Permalink /patch/27401/
State Accepted
Delegated to: David Miller
Headers show

Comments

Pablo Neira - May 19, 2009, 3:58 p.m.
nlmsg_new() adds the size of the netlink header to the value
that has been passed as parameter. If NLMSG_GOODSIZE is selected,
we request an allocation of one memory page plus the size of the
header. Instead, NLMSG_DEFAULT_SIZE should be used since it
already substracts the size of the Netlink header.

I have the impression that the similar naming in both constant
is error prone when using it with nlmsg_new(). This is already
documented in include/net/netlink.h

Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Samuel Ortiz <samuel@sortiz.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---

 net/irda/irnetlink.c   |    2 +-
 net/wireless/nl80211.c |   32 ++++++++++++++++----------------
 2 files changed, 17 insertions(+), 17 deletions(-)


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David Miller - May 19, 2009, 10:28 p.m.
From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Tue, 19 May 2009 17:58:20 +0200

> nlmsg_new() adds the size of the netlink header to the value
> that has been passed as parameter. If NLMSG_GOODSIZE is selected,
> we request an allocation of one memory page plus the size of the
> header. Instead, NLMSG_DEFAULT_SIZE should be used since it
> already substracts the size of the Netlink header.
> 
> I have the impression that the similar naming in both constant
> is error prone when using it with nlmsg_new(). This is already
> documented in include/net/netlink.h
> 
> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

Looks good, applied to net-next-2.6, thanks!
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Patch

diff --git a/net/irda/irnetlink.c b/net/irda/irnetlink.c
index 2f05ec1..82c6118 100644
--- a/net/irda/irnetlink.c
+++ b/net/irda/irnetlink.c
@@ -87,7 +87,7 @@  static int irda_nl_get_mode(struct sk_buff *skb, struct genl_info *info)
 	if (!dev)
 		return -ENODEV;
 
-	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!msg) {
 		dev_put(dev);
 		return -ENOMEM;
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index f0fec2f..ade40d5 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -388,7 +388,7 @@  static int nl80211_get_wiphy(struct sk_buff *skb, struct genl_info *info)
 	if (IS_ERR(dev))
 		return PTR_ERR(dev);
 
-	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!msg)
 		goto out_err;
 
@@ -716,7 +716,7 @@  static int nl80211_get_interface(struct sk_buff *skb, struct genl_info *info)
 	if (err)
 		return err;
 
-	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!msg)
 		goto out_err;
 
@@ -989,7 +989,7 @@  static int nl80211_get_key(struct sk_buff *skb, struct genl_info *info)
 		goto out;
 	}
 
-	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!msg) {
 		err = -ENOMEM;
 		goto out;
@@ -1600,7 +1600,7 @@  static int nl80211_get_station(struct sk_buff *skb, struct genl_info *info)
 	if (err)
 		goto out;
 
-	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!msg)
 		goto out;
 
@@ -1994,7 +1994,7 @@  static int nl80211_get_mpath(struct sk_buff *skb, struct genl_info *info)
 	if (err)
 		goto out;
 
-	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!msg)
 		goto out;
 
@@ -2310,7 +2310,7 @@  static int nl80211_get_mesh_params(struct sk_buff *skb,
 		goto out;
 
 	/* Draw up a netlink message to send back */
-	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!msg) {
 		err = -ENOBUFS;
 		goto out;
@@ -2488,7 +2488,7 @@  static int nl80211_get_reg(struct sk_buff *skb, struct genl_info *info)
 	if (!cfg80211_regdomain)
 		goto out;
 
-	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!msg) {
 		err = -ENOBUFS;
 		goto out;
@@ -3541,7 +3541,7 @@  void nl80211_notify_dev_rename(struct cfg80211_registered_device *rdev)
 {
 	struct sk_buff *msg;
 
-	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!msg)
 		return;
 
@@ -3582,7 +3582,7 @@  void nl80211_send_scan_done(struct cfg80211_registered_device *rdev,
 {
 	struct sk_buff *msg;
 
-	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!msg)
 		return;
 
@@ -3600,7 +3600,7 @@  void nl80211_send_scan_aborted(struct cfg80211_registered_device *rdev,
 {
 	struct sk_buff *msg;
 
-	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!msg)
 		return;
 
@@ -3622,7 +3622,7 @@  void nl80211_send_reg_change_event(struct regulatory_request *request)
 	struct sk_buff *msg;
 	void *hdr;
 
-	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!msg)
 		return;
 
@@ -3676,7 +3676,7 @@  static void nl80211_send_mlme_event(struct cfg80211_registered_device *rdev,
 	struct sk_buff *msg;
 	void *hdr;
 
-	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 	if (!msg)
 		return;
 
@@ -3739,7 +3739,7 @@  static void nl80211_send_mlme_timeout(struct cfg80211_registered_device *rdev,
 	struct sk_buff *msg;
 	void *hdr;
 
-	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 	if (!msg)
 		return;
 
@@ -3787,7 +3787,7 @@  void nl80211_send_ibss_bssid(struct cfg80211_registered_device *rdev,
 	struct sk_buff *msg;
 	void *hdr;
 
-	msg = nlmsg_new(NLMSG_GOODSIZE, gfp);
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp);
 	if (!msg)
 		return;
 
@@ -3822,7 +3822,7 @@  void nl80211_michael_mic_failure(struct cfg80211_registered_device *rdev,
 	struct sk_buff *msg;
 	void *hdr;
 
-	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!msg)
 		return;
 
@@ -3862,7 +3862,7 @@  void nl80211_send_beacon_hint_event(struct wiphy *wiphy,
 	void *hdr;
 	struct nlattr *nl_freq;
 
-	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 	if (!msg)
 		return;