Re: [PATCH] net/packet: check length in getsockopt() called with PACKET_HDRLEN

[David Miller]

From: Alexander Potapenko <glider@xxxxxxxxxx>
Date: Tue, 25 Apr 2017 18:51:46 +0200

> In the case getsockopt() is called with PACKET_HDRLEN and optlen < 4
> |val| remains uninitialized and the syscall may behave differently
> depending on its value, and even copy garbage to userspace on certain
> architectures. To fix this we now return -EINVAL if optlen is too small.
> 
> This bug has been detected with KMSAN.
> 
> Signed-off-by: Alexander Potapenko <glider@xxxxxxxxxx>

Applied, thanks.