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

[Tadeusz Struk]

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