From: Robert Abel <rabel@robertabel.eu>
Date: Fri, 9 Feb 2018 23:50:10 +0000 (+0100)
Subject: auxdisplay: charlcd: fix hex literal ranges for graphics command
X-Git-Tag: v4.18-rc1~102^2~4
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=2e8c04f75731bbd968fa77e94ed856f2dcf53ae6;p=thirdparty%2Fkernel%2Flinux.git

auxdisplay: charlcd: fix hex literal ranges for graphics command

The graphics command expects 16 hexadecimal literals, but would allow
characters in range [0-9a-zA-Z] instead of [0-9a-fA-F].

Signed-off-by: Robert Abel <rabel@robertabel.eu>
Acked-by: Willy Tarreau <w@1wt.eu>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
---

diff --git a/drivers/auxdisplay/charlcd.c b/drivers/auxdisplay/charlcd.c
index 0246ff77e7729..674ffbae1c656 100644
--- a/drivers/auxdisplay/charlcd.c
+++ b/drivers/auxdisplay/charlcd.c
@@ -443,9 +443,9 @@ static inline int handle_lcd_special_code(struct charlcd *lcd)
 			shift ^= 4;
 			if (*esc >= '0' && *esc <= '9') {
 				value |= (*esc - '0') << shift;
-			} else if (*esc >= 'A' && *esc <= 'Z') {
+			} else if (*esc >= 'A' && *esc <= 'F') {
 				value |= (*esc - 'A' + 10) << shift;
-			} else if (*esc >= 'a' && *esc <= 'z') {
+			} else if (*esc >= 'a' && *esc <= 'f') {
 				value |= (*esc - 'a' + 10) << shift;
 			} else {
 				esc++;