From: Ben Hutchings <ben@decadent.org.uk>
Date: Sun, 18 Jun 2017 01:36:32 +0000 (+0100)
Subject: net: add kfree_skb_list()
X-Git-Tag: v3.2.93~47
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c5923c011cd546f8e2400f44bbad2b3afc72f535;p=thirdparty%2Fkernel%2Fstable.git

net: add kfree_skb_list()

Extracted from upstream commit bd8a7036c06c "gre: fix a possible skb leak".

This patch adds a kfree_skb_list() helper.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 2af31eb76bd06..42e067bb16c8c 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -534,6 +534,7 @@ static inline struct rtable *skb_rtable(const struct sk_buff *skb)
 }
 
 extern void kfree_skb(struct sk_buff *skb);
+extern void kfree_skb_list(struct sk_buff *segs);
 extern void consume_skb(struct sk_buff *skb);
 extern void	       __kfree_skb(struct sk_buff *skb);
 extern struct sk_buff *__alloc_skb(unsigned int size,
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index b30d9c2fd5bd5..847b314b3a706 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -277,15 +277,8 @@ EXPORT_SYMBOL(dev_alloc_skb);
 
 static void skb_drop_list(struct sk_buff **listp)
 {
-	struct sk_buff *list = *listp;
-
+	kfree_skb_list(*listp);
 	*listp = NULL;
-
-	do {
-		struct sk_buff *this = list;
-		list = list->next;
-		kfree_skb(this);
-	} while (list);
 }
 
 static inline void skb_drop_fraglist(struct sk_buff *skb)
@@ -436,6 +429,17 @@ void kfree_skb(struct sk_buff *skb)
 }
 EXPORT_SYMBOL(kfree_skb);
 
+void kfree_skb_list(struct sk_buff *segs)
+{
+	while (segs) {
+		struct sk_buff *next = segs->next;
+
+		kfree_skb(segs);
+		segs = next;
+	}
+}
+EXPORT_SYMBOL(kfree_skb_list);
+
 /**
  *	consume_skb - free an skbuff
  *	@skb: buffer to free