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 v5.15.76 by commit 33fc9e26b7cb39f0d4219c875a2451802249c225, it was introduced in version v4.19 by commit 258f669e7e88c18edbc23fe5ce00a476b924551f. For more details please see the references link.