Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
To:     Bjorn Helgaas <bhelgaas@google.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Kishon Vijay Abraham I <kishon@ti.com>,
        =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= <kw@linux.com>
Cc:     linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
        Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Subject: [PATCH v2] PCI: endpoint: Use sysfs_emit() in "show" functions
Date:   Wed,  1 Sep 2021 14:09:17 +0900
Message-Id: <1630472957-26857-1-git-send-email-hayashi.kunihiko@socionext.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Precedence: bulk

Convert sprintf() in sysfs "show" functions to sysfs_emit() in order to
check for buffer overruns in sysfs outputs.

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Reviewed-by: Krzysztof Wilczyński <kw@linux.com>
---
Changes since v1:
- Add Reviewed-by line

---
drivers/pci/endpoint/functions/pci-epf-ntb.c |  4 ++--
 drivers/pci/endpoint/pci-ep-cfs.c            | 13 ++++++-------
 2 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/pci/endpoint/functions/pci-epf-ntb.c b/drivers/pci/endpoint/functions/pci-epf-ntb.c
index 8b47561..99266f05 100644
--- a/drivers/pci/endpoint/functions/pci-epf-ntb.c
+++ b/drivers/pci/endpoint/functions/pci-epf-ntb.c
@@ -1937,7 +1937,7 @@ static ssize_t epf_ntb_##_name##_show(struct config_item *item,		\
 	struct config_group *group = to_config_group(item);		\
 	struct epf_ntb *ntb = to_epf_ntb(group);			\
 									\
-	return sprintf(page, "%d\n", ntb->_name);			\
+	return sysfs_emit(page, "%d\n", ntb->_name);			\
 }
 
 #define EPF_NTB_W(_name)						\
@@ -1968,7 +1968,7 @@ static ssize_t epf_ntb_##_name##_show(struct config_item *item,		\
 									\
 	sscanf(#_name, "mw%d", &win_no);				\
 									\
-	return sprintf(page, "%lld\n", ntb->mws_size[win_no - 1]);	\
+	return sysfs_emit(page, "%lld\n", ntb->mws_size[win_no - 1]);	\
 }
 
 #define EPF_NTB_MW_W(_name)						\
diff --git a/drivers/pci/endpoint/pci-ep-cfs.c b/drivers/pci/endpoint/pci-ep-cfs.c
index 9999118..5a0394a 100644
--- a/drivers/pci/endpoint/pci-ep-cfs.c
+++ b/drivers/pci/endpoint/pci-ep-cfs.c
@@ -198,8 +198,7 @@ static ssize_t pci_epc_start_store(struct config_item *item, const char *page,
 
 static ssize_t pci_epc_start_show(struct config_item *item, char *page)
 {
-	return sprintf(page, "%d\n",
-		       to_pci_epc_group(item)->start);
+	return sysfs_emit(page, "%d\n", to_pci_epc_group(item)->start);
 }
 
 CONFIGFS_ATTR(pci_epc_, start);
@@ -321,7 +320,7 @@ static ssize_t pci_epf_##_name##_show(struct config_item *item,	char *page)    \
 	struct pci_epf *epf = to_pci_epf_group(item)->epf;		       \
 	if (WARN_ON_ONCE(!epf->header))					       \
 		return -EINVAL;						       \
-	return sprintf(page, "0x%04x\n", epf->header->_name);		       \
+	return sysfs_emit(page, "0x%04x\n", epf->header->_name);	       \
 }
 
 #define PCI_EPF_HEADER_W_u32(_name)					       \
@@ -390,8 +389,8 @@ static ssize_t pci_epf_msi_interrupts_store(struct config_item *item,
 static ssize_t pci_epf_msi_interrupts_show(struct config_item *item,
 					   char *page)
 {
-	return sprintf(page, "%d\n",
-		       to_pci_epf_group(item)->epf->msi_interrupts);
+	return sysfs_emit(page, "%d\n",
+			  to_pci_epf_group(item)->epf->msi_interrupts);
 }
 
 static ssize_t pci_epf_msix_interrupts_store(struct config_item *item,
@@ -412,8 +411,8 @@ static ssize_t pci_epf_msix_interrupts_store(struct config_item *item,
 static ssize_t pci_epf_msix_interrupts_show(struct config_item *item,
 					    char *page)
 {
-	return sprintf(page, "%d\n",
-		       to_pci_epf_group(item)->epf->msix_interrupts);
+	return sysfs_emit(page, "%d\n",
+			  to_pci_epf_group(item)->epf->msix_interrupts);
 }
 
 PCI_EPF_HEADER_R(vendorid)
-- 
2.7.4