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

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Message-ID: <20190521092935.GA2297@zhanggen-UX430UQ>
Date:   Tue, 21 May 2019 17:29:35 +0800
From:   Gen Zhang <blackgod016574@...il.com>
To:     keescook@...omium.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] consolemap: Fix a memory leaking bug in
 drivers/tty/vt/consolemap.c

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>

---
diff --git a/drivers/tty/vt/consolemap.c b/drivers/tty/vt/consolemap.c
index b28aa0d..47fbd73 100644
--- a/drivers/tty/vt/consolemap.c
+++ b/drivers/tty/vt/consolemap.c
@@ -489,7 +489,10 @@ 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);
+			return -ENOMEM;
+		}
 		memset(p2, 0xff, 64*sizeof(u16)); /* No glyphs for the characters (yet) */
 	}