Re: [PATCH] net: ipv6: fix invalid alloclen in __ip6_append_data

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On 3/8/22 21:01, David Ahern wrote:
On 3/8/22 12:46 PM, Tadeusz Struk wrote:
That fails in the same way:

skbuff: skb_over_panic: text:ffffffff83e7b48b len:65575 put:65575
head:ffff888101f8a000 data:ffff888101f8a088 tail:0x100af end:0x6c0
dev:<NULL>
------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:113!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 1852 Comm: repro Not tainted
5.17.0-rc7-00020-gea4424be1688-dirty #19
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1.fc35
RIP: 0010:skb_panic+0x173/0x175

I'm not sure how it supposed to help since it doesn't change the
alloclen at all.

alloclen is a function of fraglen and fraglen is a function of datalen.

Ok, but in this case it doesn't affect the alloclen and it still fails.

--
Thanks,
Tadeusz



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