netdev - [PATCH net-next v3] net/core: fix wrong return value in __splice

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Message-ID: <20250724121921.1796-1-hept.hept.hept@gmail.com>
Date: Thu, 24 Jul 2025 20:19:21 +0800
From: Pengtao He <hept.hept.hept@...il.com>
To: "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>,
	Willem de Bruijn <willemb@...gle.com>,
	Mina Almasry <almasrymina@...gle.com>,
	Jason Xing <kerneljasonxing@...il.com>,
	Michal Luczaj <mhal@...x.co>,
	Eric Biggers <ebiggers@...gle.com>,
	Alexander Lobakin <aleksander.lobakin@...el.com>
Cc: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Pengtao He <hept.hept.hept@...il.com>
Subject: [PATCH net-next v3] net/core: fix wrong return value in __splice_segment

Return true immediately when the last segment is processed,
avoid to walking once more in the frags loop.

Signed-off-by: Pengtao He <hept.hept.hept@...il.com>
---
v3->v2:
Reduce once condition evaluation.
v2->v1:
Correct the commit message and target tree.
v1:
https://lore.kernel.org/netdev/20250723063119.24059-1-hept.hept.hept@gmail.com/
---
 net/core/skbuff.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index ee0274417948..23b776cd9879 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -3112,7 +3112,9 @@ static bool __splice_segment(struct page *page, unsigned int poff,
 		poff += flen;
 		plen -= flen;
 		*len -= flen;
-	} while (*len && plen);
+		if (!*len)
+			return true;
+	} while (plen);
 
 	return false;
 }
-- 
2.49.0