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SubjectRe: [PATCH] net/qrtr: restrict user-controlled length in qrtr_tun_write_iter()
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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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