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	Thu, 2 Jun 2016 05:44:18 -0400
From: Kalle Valo <kvalo@codeaurora.org>
To: Arend van Spriel <arend@broadcom.com>
Cc: linux-wireless@vger.kernel.org,
	Franky Lin <franky.lin@broadcom.com>
Subject: Re: [PATCH for-4.7] brcmfmac: add eth_type_trans back for PCIe full dongle
References: <1464815616-21551-1-git-send-email-arend@broadcom.com>
	<87mvn4lyle.fsf@purkki.adurom.net>
Date: Thu, 02 Jun 2016 12:44:13 +0300
In-Reply-To: <87mvn4lyle.fsf@purkki.adurom.net> (Kalle Valo's message of "Thu,
	02 Jun 2016 12:38:37 +0300")
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Kalle Valo <kvalo@codeaurora.org> writes:

> Arend van Spriel <arend@broadcom.com> writes:
>
>> From: Franky Lin <franky.lin@broadcom.com>
>>
>> A regression was introduced in commit 9c349892ccc9 ("brcmfmac: revise
>> handling events in receive path") which moves eth_type_trans() call
>> to brcmf_rx_frame(). Msgbuf layer doesn't use brcmf_rx_frame() but invokes
>> brcmf_netif_rx() directly. In such case the Ethernet header was not
>> stripped out resulting in null pointer dereference in the networking
>> stack.
>>
>> BUG: unable to handle kernel NULL pointer dereference at 0000000000000048
>> IP: [<ffffffff814c3ce6>] enqueue_to_backlog+0x56/0x260
>> PGD 0
>> Oops: 0000 [#1] PREEMPT SMP
>> Modules linked in: fuse ipt_MASQUERADE nf_nat_masquerade_ipv4
>> iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype
>> [...]
>> rtsx_pci scsi_mod usbcore usb_common i8042 serio nvme nvme_core
>> CPU: 7 PID: 1340 Comm: irq/136-brcmf_p Not tainted 4.7.0-rc1-mainline #1
>> Hardware name: Dell Inc. XPS 15 9550/0N7TVV, BIOS 01.02.00 04/07/2016
>> task: ffff8804a0c5bd00 ti: ffff88049e124000 task.ti: ffff88049e124000
>> RIP: 0010:[<ffffffff814c3ce6>] [<ffffffff814c3ce6>]
>> enqueue_to_backlog+0x56/0x260
>> RSP: 0018:ffff88049e127ca0 EFLAGS: 00010046
>> RAX: 0000000000000000 RBX: ffff8804bddd7c40 RCX: 000000000000002f
>> RDX: 0000000000000000 RSI: 0000000000000007 RDI: ffff8804bddd7d4c
>> RBP: ffff88049e127ce8 R08: 0000000000000000 R09: 0000000000000000
>> R10: ffff8804bddd12c0 R11: 000000000000149e R12: 0000000000017c40
>> R13: ffff88049e127d08 R14: ffff8804a9bd6d00 R15: ffff8804bddd7d4c
>> FS: 0000000000000000(0000) GS:ffff8804bddc0000(0000) knlGS:0000000000000000
>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> CR2: 0000000000000048 CR3: 0000000001806000 CR4: 00000000003406e0
>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>> Stack:
>> ffff8804bdddad00 ffff8804ad089e00 0000000000000000 0000000000000282
>> 0000000000000000 ffff8804a9bd6d00 ffff8804a1b27e00 ffff8804a9bd6d00
>> ffff88002ee88000 ffff88049e127d28 ffffffff814c3f3b ffffffff81311fc3
>> Call Trace:
>> [<ffffffff814c3f3b>] netif_rx_internal+0x4b/0x170
>> [<ffffffff81311fc3>] ? swiotlb_tbl_unmap_single+0xf3/0x120
>> [<ffffffff814c5467>] netif_rx_ni+0x27/0xc0
>> [<ffffffffa08519e9>] brcmf_netif_rx+0x49/0x70 [brcmfmac]
>> [<ffffffffa08564d4>] brcmf_msgbuf_process_rx+0x2b4/0x570 [brcmfmac]
>> [<ffffffff81020017>] ? __xen_set_pgd_hyper+0x57/0xd0
>> [<ffffffff810d60b0>] ? irq_forced_thread_fn+0x70/0x70
>> [<ffffffffa0857381>] brcmf_proto_msgbuf_rx_trigger+0x31/0xe0 [brcmfmac]
>> [<ffffffffa0861e8f>] brcmf_pcie_isr_thread+0x7f/0x110 [brcmfmac]
>> [<ffffffff810d60d0>] irq_thread_fn+0x20/0x50
>> [<ffffffff810d63ad>] irq_thread+0x12d/0x1c0
>> [<ffffffff815d07d5>] ? __schedule+0x2f5/0x7a0
>> [<ffffffff810d61d0>] ? wake_threads_waitq+0x30/0x30
>> [<ffffffff810d6280>] ? irq_thread_dtor+0xb0/0xb0
>> [<ffffffff81098ea8>] kthread+0xd8/0xf0
>> [<ffffffff815d4b7f>] ret_from_fork+0x1f/0x40
>> [<ffffffff81098dd0>] ? kthread_worker_fn+0x170/0x170
>> Code: 1c f5 60 9a 8e 81 9c 58 0f 1f 44 00 00 48 89 45 d0 fa 66 0f 1f
>> 44 00 00 4c 8d bb 0c 01 00 00 4c 89 ff e8 5e 08 11 00 49 8b 56 20 <48>
>> 8b 52 48 83 e2 01 74 10 8b 8b 08 01 00 00 8b 15 59 c5 42 00
>> RIP [<ffffffff814c3ce6>] enqueue_to_backlog+0x56/0x260
>> RSP <ffff88049e127ca0>
>> CR2: 0000000000000048
>>
>> Reported-by: Grey Christoforo <grey@christoforo.net>
>
> I'll add a fixes line before I commit:
>
> Fixes: 9c349892ccc9 ("brcmfmac: revise handling events in receive path")
>
>> Reviewed-by: Pieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com>
>> Reviewed-by: Arend Van Spriel <arend@broadcom.com>
>> Reviewed-by: Hante Meuleman <hante.meuleman@broadcom.com>
>> Signed-off-by: Franky Lin <franky.lin@broadcom.com>
>> [arend@broadcom.com: rephrased the commit message]
>> Signed-off-by: Arend van Spriel <arend@broadcom.com>
>>
>> Signed-off-by: Arend van Spriel <arend@broadcom.com>
>
> And a reminder to myself to remove the two extra S-o-b lines :)

Oh, forgot to mention that I'm planning to push this to 4.7.

-- 
Kalle Valo