linux-kernel - [patch] cciss: info leak in cciss_ioctl32

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Message-ID: <20130603092645.GD16171@debian>
Date:	Mon, 3 Jun 2013 12:26:45 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Mike Miller <mike.miller@...com>
Cc:	iss_storagedev@...com, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch] cciss: info leak in cciss_ioctl32_passthru()

The arg64 struct has a hole after ->buf_size which isn't cleared.
Or if any of the calls to copy_from_user() fail then that would
cause an information leak as well.

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

diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 6374dc1..34971aa 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -1201,6 +1201,7 @@ static int cciss_ioctl32_passthru(struct block_device *bdev, fmode_t mode,
 	int err;
 	u32 cp;
 
+	memset(&arg64, 0, sizeof(arg64));
 	err = 0;
 	err |=
 	    copy_from_user(&arg64.LUN_info, &arg32->LUN_info,
--
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