[PATCH 1/6] nvme: reject a reconnect_delay of 0 through sysfs

[sashiko-bot at kernel.org]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Low] nvme: incorrect Fixes tag for nvme_ctrl_reconnect_delay_store() fix
--

commit b125e1489e83edb63c16621248dd345277c89cc1
Author: Guixin Liu <kanie at linux.alibaba.com>

nvme: reject a reconnect_delay of 0 through sysfs

This commit updates nvme_ctrl_reconnect_delay_store() in
drivers/nvme/host/sysfs.c to reject a reconnect_delay value of 0,
preventing a division by zero in nvme_ctrl_loss_tmo_store().

>     nvme: reject a reconnect_delay of 0 through sysfs
>     
>     nvme_ctrl_reconnect_delay_store() accepts any value the option parser
>     also accepts, except that it misses the lower bound: writing 0 is
>     rejected by nvmf_parse_options() but not by the sysfs attribute.
>     nvme_ctrl_loss_tmo_store() then divides by opts->reconnect_delay in
>     DIV_ROUND_UP(), so writing 0 followed by any ctrl_loss_tmo update
>     crashes the kernel with a division by zero.
>     
>     Reject 0 like the option parser does.
>     
>     Fixes: 42a45274c2258 ("nvme-fabrics: Allow ctrl loss timeout configuration")
>     Cc: stable at vger.kernel.org
>     Signed-off-by: Guixin Liu <kanie at linux.alibaba.com>

[Severity: Low]
Commit 42a45274c2258 ("nvme-fabrics: Allow ctrl loss timeout configuration")
only added ctrl_loss_tmo option parsing in nvmf_parse_options() in
drivers/nvme/host/fabrics.c, where a reconnect_delay <= 0 was already
rejected.

The sysfs store handlers nvme_ctrl_reconnect_delay_store() and
nvme_ctrl_loss_tmo_store() (later moved to drivers/nvme/host/sysfs.c in
commit 942e21c042e6) were introduced in commit 764075fdcb2f ("nvme: expose
reconnect_delay and ctrl_loss_tmo via sysfs").

Should the Fixes tag reference that commit instead:

  Fixes: 764075fdcb2f ("nvme: expose reconnect_delay and ctrl_loss_tmo via sysfs")

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20261106015842.3534898-1-kanie@linux.alibaba.com?part=1