linux-kernel - [PATCH AUTOSEL 5.1 012/141] consolemap: Fix a memory leaking bug in drivers/tty/vt/consolemap.c

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Message-Id: <20190719040246.15945-12-sashal@kernel.org>
Date:   Fri, 19 Jul 2019 00:00:37 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Gen Zhang <blackgod016574@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 5.1 012/141] consolemap: Fix a memory leaking bug in drivers/tty/vt/consolemap.c

From: Gen Zhang <blackgod016574@...il.com>

[ Upstream commit 84ecc2f6eb1cb12e6d44818f94fa49b50f06e6ac ]

In function con_insert_unipair(), when allocation for p2 and p1[n]
fails, ENOMEM is returned, but previously allocated p1 is not freed,
remains as leaking memory. Thus we should free p1 as well when this
allocation fails.

Signed-off-by: Gen Zhang <blackgod016574@...il.com>
Reviewed-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/tty/vt/consolemap.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/vt/consolemap.c b/drivers/tty/vt/consolemap.c
index 7c7ada0b3ea0..814d1b7967ae 100644
--- a/drivers/tty/vt/consolemap.c
+++ b/drivers/tty/vt/consolemap.c
@@ -489,7 +489,11 @@ con_insert_unipair(struct uni_pagedir *p, u_short unicode, u_short fontpos)
 	p2 = p1[n = (unicode >> 6) & 0x1f];
 	if (!p2) {
 		p2 = p1[n] = kmalloc_array(64, sizeof(u16), GFP_KERNEL);
-		if (!p2) return -ENOMEM;
+		if (!p2) {
+			kfree(p1);
+			p->uni_pgdir[n] = NULL;
+			return -ENOMEM;
+		}
 		memset(p2, 0xff, 64*sizeof(u16)); /* No glyphs for the characters (yet) */
 	}
 
-- 
2.20.1