mm: /proc/pid/smaps_rollup: fix no vma's null-deref
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.4.221 by commit 6bb8769326c46db3058780c0640dcc49d8187b24, it was introduced in version v4.19 by commit 258f669e7e88c18edbc23fe5ce00a476b924551f. For more details please see the references link.