linux-kernel - Re: [PATCH] net/qrtr: restrict user-controlled length in qrtr_tun_write

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Date:   Thu, 04 Feb 2021 00:40:06 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Sabyrzhan Tasbolatov <snovitoll@...il.com>
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        syzbot+c2a7e5c5211605a90865@...kaller.appspotmail.com
Subject: Re: [PATCH] net/qrtr: restrict user-controlled length in
 qrtr_tun_write_iter()

Hello:

This patch was applied to netdev/net.git (refs/heads/master):

On Tue,  2 Feb 2021 15:20:59 +0600 you wrote:
> syzbot found WARNING in qrtr_tun_write_iter [1] when write_iter length
> exceeds KMALLOC_MAX_SIZE causing order >= MAX_ORDER condition.
> 
> Additionally, there is no check for 0 length write.
> 
> [1]
> WARNING: mm/page_alloc.c:5011
> [..]
> Call Trace:
>  alloc_pages_current+0x18c/0x2a0 mm/mempolicy.c:2267
>  alloc_pages include/linux/gfp.h:547 [inline]
>  kmalloc_order+0x2e/0xb0 mm/slab_common.c:837
>  kmalloc_order_trace+0x14/0x120 mm/slab_common.c:853
>  kmalloc include/linux/slab.h:557 [inline]
>  kzalloc include/linux/slab.h:682 [inline]
>  qrtr_tun_write_iter+0x8a/0x180 net/qrtr/tun.c:83
>  call_write_iter include/linux/fs.h:1901 [inline]
> 
> [...]

Here is the summary with links:
  - net/qrtr: restrict user-controlled length in qrtr_tun_write_iter()
    https://git.kernel.org/netdev/net/c/2a80c1581237

You are awesome, thank you!
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