ext4: add check for inodes_count overflow in new resize ioctl



Addresses-Red-Hat-Bugzilla: #913245

Reported-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Cc: stable@vger.kernel.org

parent 7f3e3c7c

fs/ext4/resize.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -1882,6 +1882,10 @@ retry:
		return 0;

		n_group = ext4_get_group_number(sb, n_blocks_count - 1);
		if (n_group > (0xFFFFFFFFUL / EXT4_INODES_PER_GROUP(sb))) {
		ext4_warning(sb, "resize would cause inodes_count overflow");
		return -EINVAL;
		}
		ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset);

		n_desc_blocks = num_desc_blocks(sb, n_group + 1);