[PATCHv2] nvmet: use kzalloc instead of ZERO_PAGE in nvme_execute_identify_ns_nvm()

[Chaitanya Kulkarni]

On 11/24/24 04:55, Nilay Shroff wrote:
> The nvme_execute_identify_ns_nvm function uses ZERO_PAGE for copying
> SG list with all zeros. As ZERO_PAGE would not necessarily return the
> virtual-address of the zero page, we need to first convert the page
> address to kernel virtual-address and then use it as source address
> for copying the data to SG list with all zeros. Using return address
> of ZERO_PAGE(0) as source address for copying data to SG list would
> fill the target buffer with random/garbage value and causes the
> undesired side effect.
>
> As other identify implemenations uses kzalloc for allocating a zero
> filled buffer, we decided use kzalloc for allocating a zero filled
> buffer in nvme_execute_identify_ns_nvm function and then use this
> buffer for copying all zeros to SG list buffers. So esentially, we
> now avoid using ZERO_PAGE.
>
> Reported-by: Yi Zhang<yi.zhang at redhat.com>
> Fixes: 64a51080eaba ("nvmet: implement id ns for nvm command set")
> Link:https://lore.kernel.org/all/CAHj4cs8OVyxmn4XTvA=y4uQ3qWpdw-x3M3FSUYr-KpE-nhaFEA@mail.gmail.com/
> Signed-off-by: Nilay Shroff<nilay at linux.ibm.com>


Looks good.

Reviewed-by: Chaitanya Kulkarni <kch at nvidia.com>

-ck