linux-kernel - [patch] paride: potential information leak in pg

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Date:	Fri, 23 Sep 2011 09:25:48 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Tim Waugh <tim@...erelk.net>
Cc:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch] paride: potential information leak in pg_read()

Smatch has a new check for Rosenberg type information leaks where
structs are copied to the user with uninitialized stack data in them.
i
In this case, the pg_write_hdr struct has a hole in it.

struct pg_write_hdr {
        char                       magic;                /*     0     1 */
        char                       func;                 /*     1     1 */
        /* XXX 2 bytes hole, try to pack */
        int                        dlen;                 /*     4     4 */

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/block/paride/pg.c b/drivers/block/paride/pg.c
index 6b9a200..a79fb4f 100644
--- a/drivers/block/paride/pg.c
+++ b/drivers/block/paride/pg.c
@@ -630,6 +630,7 @@ static ssize_t pg_read(struct file *filp, char __user *buf, size_t count, loff_t
 		if (dev->status & 0x10)
 			return -ETIME;
 
+	memset(&hdr, 0, sizeof(hdr));
 	hdr.magic = PG_MAGIC;
 	hdr.dlen = dev->dlen;
 	copy = 0;

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