linux-kernel - [PATCH 1/2] char: lp: ensure that index has not exceeded LP

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Message-Id: <20220603130040.601673-1-sshedi@vmware.com>
Date:   Fri,  3 Jun 2022 18:30:39 +0530
From:   Shreenidhi Shedi <yesshedi@...il.com>
To:     arnd@...db.de, gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, yesshedi@...il.com,
        Shreenidhi Shedi <sshedi@...are.com>
Subject: [PATCH 1/2] char: lp: ensure that index has not exceeded LP_NO

From: Shreenidhi Shedi <sshedi@...are.com>

After finishing the loop, index value can be equal to LP_NO and lp_table
array is of size LP_NO, so this can end up in accessing an out of bound
address in lp_register function.

Signed-off-by: Shreenidhi Shedi <sshedi@...are.com>
---
 drivers/char/lp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/lp.c b/drivers/char/lp.c
index 0e22e3b0a..d474d02b6 100644
--- a/drivers/char/lp.c
+++ b/drivers/char/lp.c
@@ -972,7 +972,7 @@ static void lp_attach(struct parport *port)
 			if (port_num[i] == -1)
 				break;

-		if (!lp_register(i, port))
+		if (i < LP_NO && !lp_register(i, port))
 			lp_count++;
 		break;

--
2.36.1