netdev - [PATCH net-next] net: core: use helper skb_ensure

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Sun, 6 Oct 2019 18:52:43 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     David Miller <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH net-next] net: core: use helper skb_ensure_writable in more
 places

Use helper skb_ensure_writable in two more places to simplify the code.

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 net/core/dev.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 944de67ee..7d05e042c 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3165,12 +3165,9 @@ int skb_checksum_help(struct sk_buff *skb)
 	offset += skb->csum_offset;
 	BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
 
-	if (skb_cloned(skb) &&
-	    !skb_clone_writable(skb, offset + sizeof(__sum16))) {
-		ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
-		if (ret)
-			goto out;
-	}
+	ret = skb_ensure_writable(skb, offset + sizeof(__sum16));
+	if (ret)
+		goto out;
 
 	*(__sum16 *)(skb->data + offset) = csum_fold(csum) ?: CSUM_MANGLED_0;
 out_set_summed:
@@ -3205,12 +3202,11 @@ int skb_crc32c_csum_help(struct sk_buff *skb)
 		ret = -EINVAL;
 		goto out;
 	}
-	if (skb_cloned(skb) &&
-	    !skb_clone_writable(skb, offset + sizeof(__le32))) {
-		ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
-		if (ret)
-			goto out;
-	}
+
+	ret = skb_ensure_writable(skb, offset + sizeof(__le32));
+	if (ret)
+		goto out;
+
 	crc32c_csum = cpu_to_le32(~__skb_checksum(skb, start,
 						  skb->len - start, ~(__u32)0,
 						  crc32c_csum_stub));
-- 
2.23.0