kernel: ext4: avoid divide by zero when trying to mount a corrupted file system

The ext4fillflexinfo function in fs/ext4/super.c in the Linux kernel before 2.6.32-git6 allows user-assisted remote attackers to cause a denial of service divide-by-zero error and panic via a malformed ext4 filesystem containing a super block with a large FLEXBG group size aka sloggroupsperflex...

Null pointer dereference

The ext4fillsuper function in fs/ext4/super.c in the Linux kernel 2.6.27 before 2.6.27.19 and 2.6.28 before 2.6.28.7 does not validate the superblock configuration, which allows local users to cause a denial of service NULL pointer dereference and OOPS by attempting to mount a crafted ext4...

security flaw

Linux kernel 2.6.x up to 2.6.18 and possibly other versions, when SELinux hooks are enabled, allows local users to cause a denial of service crash via a malformed file stream that triggers a NULL pointer dereference in the superblockdoinit function, as demonstrated using an HFS filesystem image...