CVE-2023-54135 maple_tree: fix potential out-of-bounds access in mas_wr_end_piv()

In the Linux kernel, the following vulnerability has been resolved: mapletree: fix potential out-of-bounds access in maswrendpiv Check the write offset end bounds before using it as the offset into the pivot array. This avoids a possible out-of-bounds access on the pivot array if the write extend...