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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Lars Poeschel <poeschel@lemonage.de>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Miguel Ojeda <ojeda@kernel.org>
Subject: [PATCH 5.15 183/262] auxdisplay: lcd2s: Fix lcd2s_redefine_char() feature
Date:   Mon,  7 Mar 2022 10:18:47 +0100
Message-Id: <20220307091707.578968902@linuxfoundation.org>
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From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

commit 4424c35ead667ba2e8de7ab8206da66453e6f728 upstream.

It seems that the lcd2s_redefine_char() has never been properly
tested. The buffer is filled by DEF_CUSTOM_CHAR command followed
by the character number (from 0 to 7), but immediately after that
these bytes are rewritten by the decoded hex stream.

Fix the index to fill the buffer after the command and number.

Fixes: 8c9108d014c5 ("auxdisplay: add a driver for lcd2s character display")
Cc: Lars Poeschel <poeschel@lemonage.de>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
[fixed typo in commit message]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/auxdisplay/lcd2s.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/auxdisplay/lcd2s.c
+++ b/drivers/auxdisplay/lcd2s.c
@@ -238,7 +238,7 @@ static int lcd2s_redefine_char(struct ch
 	if (buf[1] > 7)
 		return 1;
 
-	i = 0;
+	i = 2;
 	shift = 0;
 	value = 0;
 	while (*esc && i < LCD2S_CHARACTER_SIZE + 2) {