kernel: ext4: ext4_group_add() missing initialisation issue

The ext4groupadd function in fs/ext4/resize.c in the Linux kernel 2.6.27 before 2.6.27.19 and 2.6.28 before 2.6.28.7 does not properly initialize the group descriptor during a resize aka resize2fs operation, which might allow local users to cause a denial of service OOPS by arranging for crafted...