linux-kernel - [PATCH AUTOSEL 5.15 18/23] net/core/skbuff: Check the return value of skb_copy

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Message-Id: <20220830172141.581086-18-sashal@kernel.org>
Date:   Tue, 30 Aug 2022 13:21:35 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     lily <floridsleeves@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, asml.silence@...il.com,
        imagedong@...cent.com, luiz.von.dentz@...el.com,
        vasily.averin@...ux.dev, jk@...econstruct.com.au,
        netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 18/23] net/core/skbuff: Check the return value of skb_copy_bits()

From: lily <floridsleeves@...il.com>

[ Upstream commit c624c58e08b15105662b9ab9be23d14a6b945a49 ]

skb_copy_bits() could fail, which requires a check on the return
value.

Signed-off-by: Li Zhong <floridsleeves@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/core/skbuff.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 5ebef94e14dc6..161406cd991ae 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -4188,9 +4188,8 @@ struct sk_buff *skb_segment(struct sk_buff *head_skb,
 				SKB_GSO_CB(nskb)->csum_start =
 					skb_headroom(nskb) + doffset;
 			} else {
-				skb_copy_bits(head_skb, offset,
-					      skb_put(nskb, len),
-					      len);
+				if (skb_copy_bits(head_skb, offset, skb_put(nskb, len), len))
+					goto err;
 			}
 			continue;
 		}
-- 
2.35.1