linux-kernel - [PATCH AUTOSEL 6.6 07/20] scsi: lpfc: Fix overflow build issue

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Message-ID: <20240903192425.1107562-7-sashal@kernel.org>
Date: Tue,  3 Sep 2024 15:23:39 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Sherry Yang <sherry.yang@...cle.com>,
	Justin Tee <justin.tee@...adcom.com>,
	"Martin K . Petersen" <martin.petersen@...cle.com>,
	Sasha Levin <sashal@...nel.org>,
	james.smart@...adcom.com,
	dick.kennedy@...adcom.com,
	James.Bottomley@...senPartnership.com,
	linux-scsi@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 07/20] scsi: lpfc: Fix overflow build issue

From: Sherry Yang <sherry.yang@...cle.com>

[ Upstream commit 3417c9574e368f0330637505f00d3814ca8854d2 ]

Build failed while enabling "CONFIG_GCOV_KERNEL=y" and
"CONFIG_GCOV_PROFILE_ALL=y" with following error:

BUILDSTDERR: drivers/scsi/lpfc/lpfc_bsg.c: In function 'lpfc_get_cgnbuf_info':
BUILDSTDERR: ./include/linux/fortify-string.h:114:33: error: '__builtin_memcpy' accessing 18446744073709551615 bytes at offsets 0 and 0 overlaps 9223372036854775807 bytes at offset -9223372036854775808 [-Werror=restrict]
BUILDSTDERR:   114 | #define __underlying_memcpy     __builtin_memcpy
BUILDSTDERR:       |                                 ^
BUILDSTDERR: ./include/linux/fortify-string.h:637:9: note: in expansion of macro '__underlying_memcpy'
BUILDSTDERR:   637 |         __underlying_##op(p, q, __fortify_size);                        \
BUILDSTDERR:       |         ^~~~~~~~~~~~~
BUILDSTDERR: ./include/linux/fortify-string.h:682:26: note: in expansion of macro '__fortify_memcpy_chk'
BUILDSTDERR:   682 | #define memcpy(p, q, s)  __fortify_memcpy_chk(p, q, s,                  \
BUILDSTDERR:       |                          ^~~~~~~~~~~~~~~~~~~~
BUILDSTDERR: drivers/scsi/lpfc/lpfc_bsg.c:5468:9: note: in expansion of macro 'memcpy'
BUILDSTDERR:  5468 |         memcpy(cgn_buff, cp, cinfosz);
BUILDSTDERR:       |         ^~~~~~

This happens from the commit 06bb7fc0feee ("kbuild: turn on -Wrestrict by
default"). Address this issue by using size_t type.

Signed-off-by: Sherry Yang <sherry.yang@...cle.com>
Link: https://lore.kernel.org/r/20240821065131.1180791-1-sherry.yang@oracle.com
Reviewed-by: Justin Tee <justin.tee@...adcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/lpfc/lpfc_bsg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/lpfc/lpfc_bsg.c b/drivers/scsi/lpfc/lpfc_bsg.c
index c305d16cfae9a..0166f86c7b71a 100644
--- a/drivers/scsi/lpfc/lpfc_bsg.c
+++ b/drivers/scsi/lpfc/lpfc_bsg.c
@@ -5409,7 +5409,7 @@ lpfc_get_cgnbuf_info(struct bsg_job *job)
 	struct get_cgnbuf_info_req *cgnbuf_req;
 	struct lpfc_cgn_info *cp;
 	uint8_t *cgn_buff;
-	int size, cinfosz;
+	size_t size, cinfosz;
 	int  rc = 0;
 
 	if (job->request_len < sizeof(struct fc_bsg_request) +
-- 
2.43.0