linux-kernel - [PATCH] fbdev: imxfb: warn about invalid left/right margin

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Message-Id: <20230628132437.87085-1-martin@kaiser.cx>
Date:   Wed, 28 Jun 2023 15:24:37 +0200
From:   Martin Kaiser <martin@...ser.cx>
To:     Helge Deller <deller@....de>
Cc:     Pengutronix Kernel Team <kernel@...gutronix.de>,
        linux-fbdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Martin Kaiser <martin@...ser.cx>
Subject: [PATCH] fbdev: imxfb: warn about invalid left/right margin

Warn about invalid var->left_margin or var->right_margin. Their values
are read from the device tree.

We store var->left_margin-3 and var->right_margin-1 in register
fields. These fields should be >= 0.

Fixes: 7e8549bcee00 ("imxfb: Fix margin settings")
Signed-off-by: Martin Kaiser <martin@...ser.cx>
---
 drivers/video/fbdev/imxfb.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/video/fbdev/imxfb.c b/drivers/video/fbdev/imxfb.c
index adf36690c342..5fbcb78a9cae 100644
--- a/drivers/video/fbdev/imxfb.c
+++ b/drivers/video/fbdev/imxfb.c
@@ -613,10 +613,10 @@ static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *inf
 	if (var->hsync_len < 1    || var->hsync_len > 64)
 		printk(KERN_ERR "%s: invalid hsync_len %d\n",
 			info->fix.id, var->hsync_len);
-	if (var->left_margin > 255)
+	if (var->left_margin < 3  || var->left_margin > 255)
 		printk(KERN_ERR "%s: invalid left_margin %d\n",
 			info->fix.id, var->left_margin);
-	if (var->right_margin > 255)
+	if (var->right_margin < 1 || var->right_margin > 255)
 		printk(KERN_ERR "%s: invalid right_margin %d\n",
 			info->fix.id, var->right_margin);
 	if (var->yres < 1 || var->yres > ymax_mask)
-- 
2.30.2