linux-kernel - [PATCH net-next v1 1/4] net: netmem: fix skb_ensure

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Message-ID: <20250613042804.3259045-1-almasrymina@google.com>
Date: Fri, 13 Jun 2025 04:28:01 +0000
From: Mina Almasry <almasrymina@...gle.com>
To: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-kselftest@...r.kernel.org
Cc: Mina Almasry <almasrymina@...gle.com>, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Simon Horman <horms@...nel.org>, Andrew Lunn <andrew+netdev@...n.ch>, Shuah Khan <shuah@...nel.org>
Subject: [PATCH net-next v1 1/4] net: netmem: fix skb_ensure_writable with
 unreadable skbs

skb_ensure_writable actually makes sure that the header of the skb is
writable, and doesn't touch the payload. It doesn't need an
skb_frags_readable check.

Removing this check restores DSCP functionality with unreadable skbs as
it's called from dscp_tg.

Fixes: 65249feb6b3d ("net: add support for skbs with unreadable frags")

Signed-off-by: Mina Almasry <almasrymina@...gle.com>
---
 net/core/skbuff.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 85fc82f72d26..d6420b74ea9c 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -6261,9 +6261,6 @@ int skb_ensure_writable(struct sk_buff *skb, unsigned int write_len)
 	if (!pskb_may_pull(skb, write_len))
 		return -ENOMEM;
 
-	if (!skb_frags_readable(skb))
-		return -EFAULT;
-
 	if (!skb_cloned(skb) || skb_clone_writable(skb, write_len))
 		return 0;
 

base-commit: 6d4e01d29d87356924f1521ca6df7a364e948f13
-- 
2.50.0.rc1.591.g9c95f17f64-goog