linux-kernel - [PATCH] ivtv: don't allow negative resolutions as module parameters

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Message-ID: <20210902103137.GA7291@kili>
Date:   Thu, 2 Sep 2021 13:31:37 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Andy Walls <awalls@...metrocast.net>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] ivtv: don't allow negative resolutions as module parameters

This driver takes "osd_xres" and "osd_yres" as module parameters and
caps the upper bounds but it doesn't cap the lower bounds.  Obviously
the admin is not going to enter negative resolutions but the possibility
makes static analysis more difficult.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
I also considered change the other int options to unsigned int, but
those don't lead to bugs and some are required to be signed for math
purposes.

 drivers/media/pci/ivtv/ivtvfb.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/media/pci/ivtv/ivtvfb.c b/drivers/media/pci/ivtv/ivtvfb.c
index e2d56dca5be4..c58ca8aa6d90 100644
--- a/drivers/media/pci/ivtv/ivtvfb.c
+++ b/drivers/media/pci/ivtv/ivtvfb.c
@@ -48,8 +48,8 @@ static bool osd_laced;
 static int osd_depth;
 static int osd_upper;
 static int osd_left;
-static int osd_yres;
-static int osd_xres;
+static unsigned int osd_yres;
+static unsigned int osd_xres;
 
 module_param(ivtvfb_card_id, int, 0444);
 module_param_named(debug,ivtvfb_debug, int, 0644);
@@ -58,8 +58,8 @@ module_param(osd_laced, bool, 0444);
 module_param(osd_depth, int, 0444);
 module_param(osd_upper, int, 0444);
 module_param(osd_left, int, 0444);
-module_param(osd_yres, int, 0444);
-module_param(osd_xres, int, 0444);
+module_param(osd_yres, uint, 0444);
+module_param(osd_xres, uint, 0444);
 
 MODULE_PARM_DESC(ivtvfb_card_id,
 		 "Only use framebuffer of the specified ivtv card (0-31)\n"
-- 
2.20.1