fbdev: atafb - add palette register check

Add check if palette register number is in correct range for few drivers which miss it. The regno value comes indirectly from user space. Signed-off-by: Krzysztof Helt <[email protected]> Signed-off-by: Geert Uytterhoeven <[email protected]>
patjak · Dec 6, 2009 · 8546e3c · 8546e3c
1 parent 87fbaf6
commit 8546e3c
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/drivers/video/atafb.c b/drivers/video/atafb.c
@@ -2242,6 +2242,9 @@ static int ext_setcolreg(unsigned int regno, unsigned int red,
 	if (!external_vgaiobase)
 		return 1;
 
+	if (regno > 255)
+		return 1;
+
 	switch (external_card_type) {
 	case IS_VGA:
 		OUTB(0x3c8, regno);