CVE-2022-48999 ipv4: Handle attempt to delete multipath route when fib_info contains an nh reference

In the Linux kernel, the following vulnerability has been resolved: ipv4: Handle attempt to delete multipath route when fibinfo contains an nh reference Gwangun Jung reported a slab-out-of-bounds access in fibnhmatch: fibnhmatch+0xf98/0x1130 linux-6.0-rc7/net/ipv4/fibsemantics.c:961...