!1169 [sync] PR-1162: fbcon: Check font dimension limits

Merge Pull Request from: @openeuler-sync-bot 
 

Origin pull request: 
https://gitee.com/openeuler/kernel/pulls/1162 
 
PR sync from: Zhang Changzhong <zhangchangzhong@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/RIOXNQNOVQ5DSEVFMIG6YBDCEKDWMBOS/ 
 
 
Link:https://gitee.com/openeuler/kernel/pulls/1169 

Reviewed-by: Jialin Zhang <zhangjialin11@huawei.com> 
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com> 

drivers/video/fbdev/core/fbcon.c

@@ -2513,9 +2513,12 @@ static int fbcon_set_font(struct vc_data *vc, struct console_font *font,
 	    h > FBCON_SWAP(info->var.rotate, info->var.yres, info->var.xres))
 		return -EINVAL;
 
+	if (font->width > 32 || font->height > 32)
+		return -EINVAL;
+
 	/* Make sure drawing engine can handle the font */
-	if (!(info->pixmap.blit_x & (1 << (font->width - 1))) ||
-	    !(info->pixmap.blit_y & (1 << (font->height - 1))))
+	if (!(info->pixmap.blit_x & BIT(font->width - 1)) ||
+	    !(info->pixmap.blit_y & BIT(font->height - 1)))
 		return -EINVAL;
 
 	/* Make sure driver can handle the font length */