linux-kernel - [PATCH AUTOSEL 5.4 1/6] media: gspca: cpia1: shift-out-of-bounds in set

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Date:   Sun, 12 Nov 2023 08:28:55 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Rajeshwar R Shinde <coolrrsh@...il.com>,
        syzbot+e27f3dbdab04e43b9f73@...kaller.appspotmail.com,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Sasha Levin <sashal@...nel.org>, hverkuil@...all.nl,
        linux-media@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 1/6] media: gspca: cpia1: shift-out-of-bounds in set_flicker

From: Rajeshwar R Shinde <coolrrsh@...il.com>

[ Upstream commit 099be1822d1f095433f4b08af9cc9d6308ec1953 ]

Syzkaller reported the following issue:
UBSAN: shift-out-of-bounds in drivers/media/usb/gspca/cpia1.c:1031:27
shift exponent 245 is too large for 32-bit type 'int'

When the value of the variable "sd->params.exposure.gain" exceeds the
number of bits in an integer, a shift-out-of-bounds error is reported. It
is triggered because the variable "currentexp" cannot be left-shifted by
more than the number of bits in an integer. In order to avoid invalid
range during left-shift, the conditional expression is added.

Reported-by: syzbot+e27f3dbdab04e43b9f73@...kaller.appspotmail.com
Closes: https://lore.kernel.org/all/20230818164522.12806-1-coolrrsh@gmail.com
Link: https://syzkaller.appspot.com/bug?extid=e27f3dbdab04e43b9f73
Signed-off-by: Rajeshwar R Shinde <coolrrsh@...il.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/usb/gspca/cpia1.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/media/usb/gspca/cpia1.c b/drivers/media/usb/gspca/cpia1.c
index d93d384286c16..de945e13c7c6b 100644
--- a/drivers/media/usb/gspca/cpia1.c
+++ b/drivers/media/usb/gspca/cpia1.c
@@ -18,6 +18,7 @@
 
 #include <linux/input.h>
 #include <linux/sched/signal.h>
+#include <linux/bitops.h>
 
 #include "gspca.h"
 
@@ -1027,6 +1028,8 @@ static int set_flicker(struct gspca_dev *gspca_dev, int on, int apply)
 			sd->params.exposure.expMode = 2;
 			sd->exposure_status = EXPOSURE_NORMAL;
 		}
+		if (sd->params.exposure.gain >= BITS_PER_TYPE(currentexp))
+			return -EINVAL;
 		currentexp = currentexp << sd->params.exposure.gain;
 		sd->params.exposure.gain = 0;
 		/* round down current exposure to nearest value */
-- 
2.42.0