rtnetlink: Correct nested IFLA_VF_VLAN_LIST attribute validation

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: rtnetlink: Correct nested IFLA_VF_VLAN_LIST attribute validation Each attribute inside a nested IFLA_VF_VLAN_LIST is assumed to be a struct ifla_vf_vlan_info so the size of such attribute needs to be at least of sizeof(struct ifla_vf_vlan_info) which is 14 bytes. The current size validation in do_setvfinfo is against NLA_HDRLEN (4 bytes) which is less than sizeof(struct ifla_vf_vlan_info) so this validation is not enough and a too small attribute might be cast to a struct ifla_vf_vlan_info, this might result in an out of bands read access when accessing the saved (casted) entry in ivvl.

References

• https://git.kernel.org/stable/c/8ac69ff2d0d5be9734c4402de932aa3dc8549c1a
• https://git.kernel.org/stable/c/5e7ef2d88666a0212db8c38e6703864b9ce70169
• https://git.kernel.org/stable/c/6c8f44b02500c7d14b5e6618fe4ef9a0da47b3de
• https://git.kernel.org/stable/c/f3c1bf3054f96ddeab0621d920445bada769b40e
• https://git.kernel.org/stable/c/6e4c7193954f4faab92f6e8d88bc5565317b44e7
• https://git.kernel.org/stable/c/206003c748b88890a910ef7142d18f77be57550b
• https://git.kernel.org/stable/c/4a4b9757789a1551d2df130df23bfb3545bfa7e8
• https://git.kernel.org/stable/c/1aec77b2bb2ed1db0f5efc61c4c1ca3813307489