CVE-2025-40198 ext4: avoid potential buffer over-read in parse_apply_sb_mount_options()

In the Linux kernel, the following vulnerability has been resolved: ext4: avoid potential buffer over-read in parseapplysbmountoptions Unlike other strings in the ext4 superblock, we rely on tune2fs to make sure smountopts is NUL terminated. Harden parseapplysbmountoptions by treating smountopts ...