[Linux-stable-mirror] Fixing CVE-2017-16939 in v4.4.y and possibly v3.18.y

Hi,

The fix for CVE-2017-16939 has been applied to v4.9.y, but not to v4.4.y and older kernels. However, I confirmed that running the published POC (see https://blogs.securiteam.com/index.php/archives/3535) does crash a 4.4 kernel.

I confirmed that the following two patches fix the problem in v4.4.y. Please consider applying them to v4.4.y (and possibly v3.18.y).

fc9e50f5a5a4e ("netlink: add a start callback for starting a netlink dump") 1137b5e2529a8 ("ipsec: Fix aborted xfrm policy dump crash")

My apologies for the noise if this is already under consideration.

Thanks, Guenter