linux-kernel - Re: [syzbot] [PATCH net] netlink: Fix kernel-infoleak in __skb_datagram

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Date: Mon, 19 Feb 2024 18:42:45 -0800
From: syzbot <syzbot+34ad5fab48f7bf510349@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [PATCH net] netlink: Fix kernel-infoleak in __skb_datagram_iter()

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Subject: [PATCH net] netlink: Fix kernel-infoleak in __skb_datagram_iter()
Author: ryasuoka@...hat.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 5bd7ef53ffe5

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index eb086b06d60d..8277399d19b3 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -167,7 +167,7 @@ static inline u32 netlink_group_mask(u32 group)
 static struct sk_buff *netlink_to_full_skb(const struct sk_buff *skb,
                                           gfp_t gfp_mask)
 {
-       unsigned int len = skb_end_offset(skb);
+       unsigned int len = skb->len;
        struct sk_buff *new;

        new = alloc_skb(len, gfp_mask);