Commit 3f8a6411 authored by Theodore Ts'o's avatar Theodore Ts'o
Browse files

ext4: add check for inodes_count overflow in new resize ioctl 



Addresses-Red-Hat-Bugzilla: #913245

Reported-by: default avatarEric Sandeen <sandeen@redhat.com>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: default avatarCarlos 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 @@ int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count) 
		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);