linux-kernel - Linux kernel: net/irda/af_irda.c: irda

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Date:   Thu, 3 Aug 2017 22:02:07 +0800 (CST)
From:   sohu0106 <sohu0106@....com>
To:     torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Linux kernel: net/irda/af_irda.c: irda_getsockopt() stack infoleak



Sometimes irda_getsockopt() doesn't initialize all members of list field of irda_device_list struct.  This structure is then copied to
userland.  It leads to leaking of contents of kernel stack memory.  

2  net/irda/af_irda.c
@@ -2248,6 +2248,8 @@ static int irda_getsockopt(struct socket *sock, int level, int optname,
 			err = -EINVAL;
 			goto out;
 		}
+			
+		memset( &list, 0, sizeof(struct irda_device_list) );
 
 		/* Ask lmp for the current discovery log */
 		discoveries = irlmp_get_discoveries(&list.len, self->mask.word,