From: Bart Van Assche <bvanassche@acm.org>
To: Keith Busch <kbusch@kernel.org>, Sagi Grimberg <sagi@grimberg.me>
Cc: Christoph Hellwig <hch@lst.de>,
linux-nvme@lists.infradead.org,
Bart Van Assche <bvanassche@acm.org>
Subject: [PATCH v2] nvme: Fix handling of large MDTS values
Date: Wed, 31 Mar 2021 20:59:52 -0700 [thread overview]
Message-ID: <20210401035952.7249-1-bvanassche@acm.org> (raw)
Instead of triggering an integer overflow and undefined behavior if MDTS is
large, set max_hw_sectors to UINT_MAX.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
Changes compared to v1: removed a dev_err() call.
drivers/nvme/host/core.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 40215a0246e4..25bc28e8845f 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3123,10 +3123,11 @@ static int nvme_init_identify(struct nvme_ctrl *ctrl)
atomic_set(&ctrl->abort_limit, id->acl + 1);
ctrl->vwc = id->vwc;
- if (id->mdts)
- max_hw_sectors = 1 << (id->mdts + page_shift - 9);
- else
+ max_hw_sectors = UINT_MAX;
+ if (id->mdts && check_shl_overflow(1U, id->mdts + page_shift - 9,
+ &max_hw_sectors)) {
max_hw_sectors = UINT_MAX;
+ }
ctrl->max_hw_sectors =
min_not_zero(ctrl->max_hw_sectors, max_hw_sectors);
_______________________________________________
Linux-nvme mailing list
Linux-nvme@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-nvme
next reply other threads:[~2021-04-01 4:00 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-01 3:59 Bart Van Assche [this message]
2021-04-01 8:26 ` [PATCH v2] nvme: Fix handling of large MDTS values Sagi Grimberg
2021-04-01 15:54 ` Keith Busch
2021-04-02 1:37 ` Bart Van Assche
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210401035952.7249-1-bvanassche@acm.org \
--to=bvanassche@acm.org \
--cc=hch@lst.de \
--cc=kbusch@kernel.org \
--cc=linux-nvme@lists.infradead.org \
--cc=sagi@grimberg.me \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox