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media: pci: mgb4: fix potential spectre vulnerability

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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-cisco@xs4all.nl>
Reviewed-by: Martin Tůma <martin.tuma@digiteqautomotive.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
This commit is contained in:
Hans Verkuil 2023-10-06 12:08:50 +02:00
parent ada092e80c
commit 65b8c8cb2b
1 changed files with 4 additions and 1 deletions
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5
drivers/media/pci/mgb4/mgb4_sysfs_out.c
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@ -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);