Subject: Re: [PATCH] mwifiex_usb: Fix skb_over_panic in mwifiex_usb_recv

From: Kalle Valo <[email-masked]>
Date: Mon, 01 Nov 2021 16:07:59 +0200

Zekun Shen <[email-masked]> writes:

> Currently, with an unknown recv_type, mwifiex_usb_recv
> just return -1 without restoring the skb. Next time
> mwifiex_usb_rx_complete is invoked with the same skb,
> calling skb_put causes skb_over_panic.
>
> The bug is triggerable with a compromised/malfunctioning
> usb device. After applying the patch, skb_over_panic
> no longer shows up with the same input.
>
> Attached is the panic report from fuzzing.
> skbuff: skb_over_panic: text:000000003bf1b5fa
>  len:2048 put:4 head:00000000dd6a115b data:000000000a9445d8
>  tail:0x844 end:0x840 dev:<NULL>
> kernel BUG at net/core/skbuff.c:109!
> invalid opcode: 0000 [#1] SMP KASAN NOPTI
> CPU: 0 PID: 198 Comm: in:imklog Not tainted 5.6.0 #60
> RIP: 0010:skb_panic+0x15f/0x161
> Call Trace:
>  <IRQ>
>  ? mwifiex_usb_rx_complete+0x26b/0xfcd [mwifiex_usb]
>  skb_put.cold+0x24/0x24
>  mwifiex_usb_rx_complete+0x26b/0xfcd [mwifiex_usb]
>  __usb_hcd_giveback_urb+0x1e4/0x380
>  usb_giveback_urb_bh+0x241/0x4f0
>  ? __hrtimer_run_queues+0x316/0x740
>  ? __usb_hcd_giveback_urb+0x380/0x380
>  tasklet_action_common.isra.0+0x135/0x330
>  __do_softirq+0x18c/0x634
>  irq_exit+0x114/0x140
>  smp_apic_timer_interrupt+0xde/0x380
>  apic_timer_interrupt+0xf/0x20
>  </IRQ>
>
> Reported-by: Zekun Shen <[email-masked]>

You are the author, no need to have your name in Reported-by.

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