CVE-2022-50295 io_uring/msg_ring: Fix NULL pointer dereference in io_msg_send_fd()

In the Linux kernel, the following vulnerability has been resolved: iouring/msgring: Fix NULL pointer dereference in iomsgsendfd Syzkaller produced the below call trace: BUG: KASAN: null-ptr-deref in iomsgring+0x3cb/0x9f0 Write of size 8 at addr 0000000000000070 by task repro/16399 CPU: 0 PID:...