[Drbd-dev] [PATCH] drbd: Fix kernel_sendmsg() usage
richard at nod.at
Tue Nov 8 17:02:57 CET 2016
On 08.11.2016 16:49, Christoph Hellwig wrote:
> On Tue, Nov 08, 2016 at 11:43:09AM +0100, Richard Weinberger wrote:
>> Don't pass a size larger than iov_len to kernel_sendmsg().
>> Otherwise it will cause a NULL pointer deref when kernel_sendmsg()
>> returns with rv < size.
>> Although the issue exists since day 0, only on non-ancient kernels
>> that contain change 57be5bdad759 ("ip: convert tcp_sendmsg() to iov_iter
>> primitives") it seems to trigger .
> The real fix here is to convert it to the right primitive, e.g. take
> Al's patch from here:
Yes, I talked already with Al about this. He suggested to fix the size parameter
first such that back-porting to -stable is easy.
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