linux-kernel - Re: [syzbot] [tipc?] kernel BUG in __pskb_pull

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Message-Id: <20241213230820.1957-1-hdanton@sina.com>
Date: Sat, 14 Dec 2024 07:08:20 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+4f66250f6663c0c1d67e@...kaller.appspotmail.com>
Cc: edumazet@...gle.com,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [tipc?] kernel BUG in __pskb_pull_tail

On Thu, 12 Dec 2024 14:20:26 -0800
> syzbot found the following issue on:
> 
> HEAD commit:    96b6fcc0ee41 Merge branch 'net-dsa-cleanup-eee-part-1'
> git tree:       net-next
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=117844f8580000

Test fix (https://patchwork.kernel.org/project/netdevbpf/patch/20241212222247.724674-1-edumazet@google.com/ )

#syz test

--- x/drivers/net/tun.c
+++ y/drivers/net/tun.c
@@ -1485,7 +1485,7 @@ static struct sk_buff *tun_napi_alloc_fr
 	skb->truesize += skb->data_len;
 
 	for (i = 1; i < it->nr_segs; i++) {
-		const struct iovec *iov = iter_iov(it);
+		const struct iovec *iov = iter_iov(it) + i;
 		size_t fragsz = iov->iov_len;
 		struct page *page;
 		void *frag;
--