On Thu, Apr 23, 2015 at 09:31:21AM +0800, Qu Wenruo wrote:
> Current btrfs only support CRC32 checksum, and if csum_type is 1, we
> will get 0 csum size, causing 0 division later destroy the whole kernel.
> Or csum_type is later than 1, we will get data from other random memory
> causing more problem.
The check for csum type is already there in btrfs_check_super_csum, but
it's wrong and should be fixed.
btrfs_csum_sizes = { 4, 0 };
429 if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {
430 printk(KERN_ERR "BTRFS: unsupported checksum algorithm %u\n",
431 csum_type);
432 ret = 1;
433 }
434
and the check fails to catch csum_type == 1.
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