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Subject: media: pci: mgb4: fix potential spectre vulnerability
Author: Hans Verkuil <hverkuil-ci...@xs4all.nl>
Date: Fri Oct 6 12:08:50 2023 +0200
Fix smatch warnings:
drivers/media/pci/mgb4/mgb4_sysfs_out.c:118 video_source_store() warn:
potential spectre issue 'mgbdev->vin' [r] (local cap)
drivers/media/pci/mgb4/mgb4_sysfs_out.c:122 video_source_store() warn: possible
spectre second half. 'loopin_new'
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>
Reviewed-by: Martin Tůma <martin.t...@digiteqautomotive.com>
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>
drivers/media/pci/mgb4/mgb4_sysfs_out.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/drivers/media/pci/mgb4/mgb4_sysfs_out.c
b/drivers/media/pci/mgb4/mgb4_sysfs_out.c
index 23a9aabf3915..9f6e81c57726 100644
--- a/drivers/media/pci/mgb4/mgb4_sysfs_out.c
+++ b/drivers/media/pci/mgb4/mgb4_sysfs_out.c
@@ -8,6 +8,7 @@
*/
#include <linux/device.h>
+#include <linux/nospec.h>
#include "mgb4_core.h"
#include "mgb4_i2c.h"
#include "mgb4_vout.h"
@@ -114,8 +115,10 @@ static ssize_t video_source_store(struct device *dev,
if (((config & 0xc) >> 2) < MGB4_VIN_DEVICES)
loopin_old = mgbdev->vin[(config & 0xc) >> 2];
- if (val < MGB4_VIN_DEVICES)
+ if (val < MGB4_VIN_DEVICES) {
+ val = array_index_nospec(val, MGB4_VIN_DEVICES);
loopin_new = mgbdev->vin[val];
+ }
if (loopin_old && loopin_cnt(loopin_old) == 1)
mgb4_mask_reg(&mgbdev->video, loopin_old->config->regs.config,
0x2, 0x0);
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