ext4: validate s_reserved_gdt_blocks on mount

If s_reserved_gdt_blocks is extremely large, it's possible for
ext4_init_block_bitmap(), which is called when ext4 sets up an
uninitialized block bitmap, to corrupt random kernel memory.  Add the
same checks which e2fsck has --- it must never be larger than
blocksize / sizeof(__u32) --- and then add a backup check in
ext4_init_block_bitmap() in case the superblock gets modified after
the file system is mounted.

Reported-by: Vegard Nossum <[email protected]>
Signed-off-by: Theodore Ts'o <[email protected]>
Cc: [email protected]

0 files changed, 0 insertions, 0 deletions