From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Wed, 16 Nov 2011 08:21:50 +0000 (+0100)
Subject: paride: fix potential information leak in pg_read()
X-Git-Tag: upstream/snapshot3+hdmi~8702^2~1
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a2c2a0e668e26e020731ce2a40e6474d1d37210a;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

paride: fix 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@oracle.com>
Cc: Tim Waugh <tim@cyberelk.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

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;