From adb77bba9c664f5d120e0ffb1387e9d7408e1529 Mon Sep 17 00:00:00 2001
From: Kees Cook <keescook@chromium.org>
Date: Tue, 9 Apr 2024 19:31:52 -0700
Subject: [PATCH] scsi: mpt3sas: Avoid possible run-time warning with long
manufacturer strings
The prior strscpy() replacement of strncpy() here expected the
manufacture_reply strings to be NUL-terminated, but it is possible
they are not, as the code pattern here shows, e.g., edev->vendor_id
being exactly 1 character larger than manufacture_reply->vendor_id,
and the replaced strncpy() was copying only up to the size of the
source character array. Replace this with memtostr(), which is the
unambiguous way to convert a maybe not-NUL-terminated character array
into a NUL-terminated string.
Fixes: b7e9712a02e8 ("scsi: mpt3sas: Replace deprecated strncpy() with strscpy()")
Signed-off-by: Kees Cook <keescook@chromium.org>
Tested-by: Marco Patalano <mpatalan@redhat.com>
Reviewed-by: Ewan D. Milne <emilne@redhat.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20240410023155.2100422-3-keescook@chromium.org
Signed-off-by: Kees Cook <kees@kernel.org>
---
drivers/scsi/mpt3sas/mpt3sas_base.c | 2 +-
drivers/scsi/mpt3sas/mpt3sas_transport.c | 14 +++++---------
2 files changed, 6 insertions(+), 10 deletions(-)
diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c
index 258647fc6bddb..1320e06727df1 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_base.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
@@ -4774,7 +4774,7 @@ _base_display_ioc_capabilities(struct MPT3SAS_ADAPTER *ioc)
char desc[17] = {0};
u32 iounit_pg1_flags;
- strscpy(desc, ioc->manu_pg0.ChipName, sizeof(desc));
+ memtostr(desc, ioc->manu_pg0.ChipName);
ioc_info(ioc, "%s: FWVersion(%02d.%02d.%02d.%02d), ChipRevision(0x%02x)\n",
desc,
(ioc->facts.FWVersion.Word & 0xFF000000) >> 24,
diff --git a/drivers/scsi/mpt3sas/mpt3sas_transport.c b/drivers/scsi/mpt3sas/mpt3sas_transport.c
index 76f9a91771985..d84413b77d849 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_transport.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_transport.c
@@ -458,17 +458,13 @@ _transport_expander_report_manufacture(struct MPT3SAS_ADAPTER *ioc,
goto out;
manufacture_reply = data_out + sizeof(struct rep_manu_request);
- strscpy(edev->vendor_id, manufacture_reply->vendor_id,
- sizeof(edev->vendor_id));
- strscpy(edev->product_id, manufacture_reply->product_id,
- sizeof(edev->product_id));
- strscpy(edev->product_rev, manufacture_reply->product_rev,
- sizeof(edev->product_rev));
+ memtostr(edev->vendor_id, manufacture_reply->vendor_id);
+ memtostr(edev->product_id, manufacture_reply->product_id);
+ memtostr(edev->product_rev, manufacture_reply->product_rev);
edev->level = manufacture_reply->sas_format & 1;
if (edev->level) {
- strscpy(edev->component_vendor_id,
- manufacture_reply->component_vendor_id,
- sizeof(edev->component_vendor_id));
+ memtostr(edev->component_vendor_id,
+ manufacture_reply->component_vendor_id);
tmp = (u8 *)&manufacture_reply->component_id;
edev->component_id = tmp[0] << 8 | tmp[1];
edev->component_revision_id =
--
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