From: Thomas Zimmermann <tzimmermann@suse.de>
Date: Mon, 9 Mar 2026 14:14:50 +0000 (+0100)
Subject: lib/fonts: Read font size with font_data_size()
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=e2e000a0b22036a72474088d3399097ff47ace02;p=thirdparty%2Fkernel%2Flinux.git

lib/fonts: Read font size with font_data_size()

Add font_data_size() and update consoles to use it.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Helge Deller <deller@gmx.de>
---

diff --git a/drivers/video/console/newport_con.c b/drivers/video/console/newport_con.c
index 857b85df360c0..00ace2940aa07 100644
--- a/drivers/video/console/newport_con.c
+++ b/drivers/video/console/newport_con.c
@@ -530,7 +530,7 @@ static int newport_set_font(int unit, const struct console_font *op,
 	/* check if font is already used by other console */
 	for (i = 0; i < MAX_NR_CONSOLES; i++) {
 		if (font_data[i] != FONT_DATA
-		    && FNTSIZE(font_data[i]) == size
+		    && font_data_size(font_data[i]) == size
 		    && !memcmp(font_data[i], new_data, size)) {
 			kfree(new_data - FONT_EXTRA_WORDS * sizeof(int));
 			/* current font is the same as the new one */
diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index 8d7840b9ebad9..fa8f3e4196de2 100644
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -2053,7 +2053,7 @@ static int fbcon_resize(struct vc_data *vc, unsigned int width,
 	struct fb_var_screeninfo var = info->var;
 	int x_diff, y_diff, virt_w, virt_h, virt_fw, virt_fh;
 
-	if (p->userfont && FNTSIZE(p->fontdata)) {
+	if (p->userfont && font_data_size(p->fontdata)) {
 		unsigned int size = vc_font_size(&vc->vc_font);
 
 		/*
@@ -2063,7 +2063,7 @@ static int fbcon_resize(struct vc_data *vc, unsigned int width,
 		 * charcount can change and cannot be used to determine the
 		 * font data allocated size.
 		 */
-		if (!size || size > FNTSIZE(p->fontdata))
+		if (!size || size > font_data_size(p->fontdata))
 			return -EINVAL;
 	}
 
@@ -2302,7 +2302,7 @@ static int fbcon_get_font(struct vc_data *vc, struct console_font *font, unsigne
 
 	if (font->width <= 8) {
 		j = vc->vc_font.height;
-		if (font->charcount * j > FNTSIZE(fontdata))
+		if (font->charcount * j > font_data_size(fontdata))
 			return -EINVAL;
 
 		for (i = 0; i < font->charcount; i++) {
@@ -2313,7 +2313,7 @@ static int fbcon_get_font(struct vc_data *vc, struct console_font *font, unsigne
 		}
 	} else if (font->width <= 16) {
 		j = vc->vc_font.height * 2;
-		if (font->charcount * j > FNTSIZE(fontdata))
+		if (font->charcount * j > font_data_size(fontdata))
 			return -EINVAL;
 
 		for (i = 0; i < font->charcount; i++) {
@@ -2323,7 +2323,7 @@ static int fbcon_get_font(struct vc_data *vc, struct console_font *font, unsigne
 			fontdata += j;
 		}
 	} else if (font->width <= 24) {
-		if (font->charcount * (vc->vc_font.height * sizeof(u32)) > FNTSIZE(fontdata))
+		if (font->charcount * (vc->vc_font.height * sizeof(u32)) > font_data_size(fontdata))
 			return -EINVAL;
 
 		for (i = 0; i < font->charcount; i++) {
@@ -2338,7 +2338,7 @@ static int fbcon_get_font(struct vc_data *vc, struct console_font *font, unsigne
 		}
 	} else {
 		j = vc->vc_font.height * 4;
-		if (font->charcount * j > FNTSIZE(fontdata))
+		if (font->charcount * j > font_data_size(fontdata))
 			return -EINVAL;
 
 		for (i = 0; i < font->charcount; i++) {
@@ -2553,7 +2553,7 @@ static int fbcon_set_font(struct vc_data *vc, const struct console_font *font,
 		if (fb_display[i].userfont &&
 		    fb_display[i].fontdata &&
 		    FNTSUM(fb_display[i].fontdata) == csum &&
-		    FNTSIZE(fb_display[i].fontdata) == size &&
+		    font_data_size(fb_display[i].fontdata) == size &&
 		    tmp->vc_font.width == w &&
 		    !memcmp(fb_display[i].fontdata, new_data, size)) {
 			kfree(new_data - FONT_EXTRA_WORDS * sizeof(int));
diff --git a/include/linux/font.h b/include/linux/font.h
index 746a0996a018b..5b8557813c5c7 100644
--- a/include/linux/font.h
+++ b/include/linux/font.h
@@ -54,6 +54,8 @@ static inline const unsigned char *font_data_buf(font_data_t *fd)
 	return (const unsigned char *)fd;
 }
 
+unsigned int font_data_size(font_data_t *fd);
+
 /*
  * Font description
  */
diff --git a/lib/fonts/fonts.c b/lib/fonts/fonts.c
index a7f118b301719..8c9a6762061cb 100644
--- a/lib/fonts/fonts.c
+++ b/lib/fonts/fonts.c
@@ -20,6 +20,27 @@
 #endif
 #include <linux/font.h>
 
+/*
+ * Helpers for font_data_t
+ */
+
+/**
+ * font_data_size - Return size of the font data in bytes
+ * @fd: Font data
+ *
+ * Returns:
+ * The number of bytes in the given font data.
+ */
+unsigned int font_data_size(font_data_t *fd)
+{
+	return FNTSIZE(fd);
+}
+EXPORT_SYMBOL_GPL(font_data_size);
+
+/*
+ * Font lookup
+ */
+
 static const struct font_desc *fonts[] = {
 #ifdef CONFIG_FONT_8x8
 	&font_vga_8x8,