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[v3,11/11] platform/x86/amd/hsmp: Fix potential spectre issue

Message ID 20240720174552.946255-11-suma.hegde@amd.com (mailing list archive)
State Changes Requested, archived
Headers show
Series [v3,01/11] platform/x86/amd/hsmp: Create hsmp/ directory | expand

Commit Message

Suma Hegde July 20, 2024, 5:45 p.m. UTC 
Fix below warning caused by smatch by using array_index_nospec()
to clamp the index within the range.
"warn: potential spectre issue 'plat_dev.sock' [r] (local cap)"

Signed-off-by: Suma Hegde <suma.hegde@amd.com>
Reviewed-by: Naveen Krishna Chatradhi <naveenkrishna.chatradhi@amd.com>
---
Changes since v2:
None
Changes since v1:
Change plat_dev to hsmp_pdev

 drivers/platform/x86/amd/hsmp/acpi.c | 3 +++
 drivers/platform/x86/amd/hsmp/plat.c | 3 +++
 2 files changed, 6 insertions(+)
diff mbox series

Patch

diff --git a/drivers/platform/x86/amd/hsmp/acpi.c b/drivers/platform/x86/amd/hsmp/acpi.c
index 4b1470ca8675..cc859c9fe2dd 100644
--- a/drivers/platform/x86/amd/hsmp/acpi.c
+++ b/drivers/platform/x86/amd/hsmp/acpi.c
@@ -19,6 +19,7 @@ 
 #include <linux/dev_printk.h>
 #include <linux/ioport.h>
 #include <linux/kstrtox.h>
+#include <linux/nospec.h>
 #include <linux/platform_device.h>
 #include <linux/uuid.h>
 
@@ -275,6 +276,8 @@  static int init_acpi(struct device *dev)
 	if (sock_ind >= hsmp_pdev.num_sockets)
 		return -EINVAL;
 
+	sock_ind = array_index_nospec(sock_ind, hsmp_pdev.num_sockets);
+
 	ret = hsmp_parse_acpi_table(dev, sock_ind);
 	if (ret) {
 		dev_err(dev, "Failed to parse ACPI table\n");
diff --git a/drivers/platform/x86/amd/hsmp/plat.c b/drivers/platform/x86/amd/hsmp/plat.c
index 33868346b5a0..00dc7a0d358d 100644
--- a/drivers/platform/x86/amd/hsmp/plat.c
+++ b/drivers/platform/x86/amd/hsmp/plat.c
@@ -17,6 +17,7 @@ 
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/pci.h>
+#include <linux/nospec.h>
 #include <linux/platform_device.h>
 
 #define DRIVER_NAME		"amd_hsmp"
@@ -77,6 +78,8 @@  static ssize_t hsmp_metric_tbl_read(struct file *filp, struct kobject *kobj,
 	if (sock_ind >= hsmp_pdev.num_sockets)
 		return -EINVAL;
 
+	sock_ind = array_index_nospec(sock_ind, hsmp_pdev.num_sockets);
+
 	sock = &hsmp_pdev.sock[sock_ind];
 	if (!sock)
 		return -EINVAL;