Re: [PATCH AUTOSEL 6.5 31/36] block: Allow bio_iov_iter_get_pages() with bio->bi_bdev unset

On 9/8/23 1:28 PM, Sasha Levin wrote:

From: Kent Overstreet kent.overstreet@linux.dev

[ Upstream commit 168145f617d57bf4e474901b7ffa869337a802e6 ]

bio_iov_iter_get_pages() trims the IO based on the block size of the block device the IO will be issued to.

However, bcachefs is a multi device filesystem; when we're creating the bio we don't yet know which block device the bio will be submitted to - we have to handle the alignment checks elsewhere.

Thus this is needed to avoid a null ptr deref.

Please drop this one from -stable, there's no need.