linux-kernel - Re: [PATCH v2] xen/netback: avoid entering xenvif_rx_next

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Date:   Thu, 14 Jul 2022 17:20:13 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Juergen Gross <jgross@...e.com>
Cc:     xen-devel@...ts.xenproject.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, wei.liu@...nel.org, paul@....org,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, stable@...r.kernel.org, jbeulich@...e.com
Subject: Re: [PATCH v2] xen/netback: avoid entering xenvif_rx_next_skb() with an
 empty rx queue

Hello:

This patch was applied to netdev/net.git (master)
by Jakub Kicinski <kuba@...nel.org>:

On Wed, 13 Jul 2022 15:53:22 +0200 you wrote:
> xenvif_rx_next_skb() is expecting the rx queue not being empty, but
> in case the loop in xenvif_rx_action() is doing multiple iterations,
> the availability of another skb in the rx queue is not being checked.
> 
> This can lead to crashes:
> 
> [40072.537261] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
> [40072.537407] IP: xenvif_rx_skb+0x23/0x590 [xen_netback]
> [40072.537534] PGD 0 P4D 0
> [40072.537644] Oops: 0000 [#1] SMP NOPTI
> [40072.537749] CPU: 0 PID: 12505 Comm: v1-c40247-q2-gu Not tainted 4.12.14-122.121-default #1 SLE12-SP5
> [40072.537867] Hardware name: HP ProLiant DL580 Gen9/ProLiant DL580 Gen9, BIOS U17 11/23/2021
> [40072.537999] task: ffff880433b38100 task.stack: ffffc90043d40000
> [40072.538112] RIP: e030:xenvif_rx_skb+0x23/0x590 [xen_netback]
> [40072.538217] RSP: e02b:ffffc90043d43de0 EFLAGS: 00010246
> [40072.538319] RAX: 0000000000000000 RBX: ffffc90043cd7cd0 RCX: 00000000000000f7
> [40072.538430] RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffffc90043d43df8
> [40072.538531] RBP: 000000000000003f R08: 000077ff80000000 R09: 0000000000000008
> [40072.538644] R10: 0000000000007ff0 R11: 00000000000008f6 R12: ffffc90043ce2708
> [40072.538745] R13: 0000000000000000 R14: ffffc90043d43ed0 R15: ffff88043ea748c0
> [40072.538861] FS: 0000000000000000(0000) GS:ffff880484600000(0000) knlGS:0000000000000000
> [40072.538988] CS: e033 DS: 0000 ES: 0000 CR0: 0000000080050033
> [40072.539088] CR2: 0000000000000080 CR3: 0000000407ac8000 CR4: 0000000000040660
> [40072.539211] Call Trace:
> [40072.539319] xenvif_rx_action+0x71/0x90 [xen_netback]
> [40072.539429] xenvif_kthread_guest_rx+0x14a/0x29c [xen_netback]
> 
> [...]

Here is the summary with links:
  - [v2] xen/netback: avoid entering xenvif_rx_next_skb() with an empty rx queue
    https://git.kernel.org/netdev/net/c/94e810067888

You are awesome, thank you!
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