linux-kernel - [PATCH 3.14 003/140] SCSI: megaraid: missing bounds check in mimd_to

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Message-Id: <20140529043050.024592974@linuxfoundation.org>
Date:	Wed, 28 May 2014 21:32:22 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Nico Golde <nico@...lde.de>,
	Fabian Yamaguchi <fabs@...sec.de>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Sumit Saxena <sumit.saxena@....com>,
	James Bottomley <JBottomley@...allels.com>
Subject: [PATCH 3.14 003/140] SCSI: megaraid: missing bounds check in mimd_to_kioc()

3.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@...cle.com>

commit 3de2260140417759c669d391613d583baf03b0cf upstream.

pthru32->dataxferlen comes from the user so we need to check that it's
not too large so we don't overflow the buffer.

Reported-by: Nico Golde <nico@...lde.de>
Reported-by: Fabian Yamaguchi <fabs@...sec.de>
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Acked-by: Sumit Saxena <sumit.saxena@....com>
Signed-off-by: James Bottomley <JBottomley@...allels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/megaraid/megaraid_mm.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/scsi/megaraid/megaraid_mm.c
+++ b/drivers/scsi/megaraid/megaraid_mm.c
@@ -486,6 +486,8 @@ mimd_to_kioc(mimd_t __user *umimd, mraid
 
 	pthru32->dataxferaddr	= kioc->buf_paddr;
 	if (kioc->data_dir & UIOC_WR) {
+		if (pthru32->dataxferlen > kioc->xferlen)
+			return -EINVAL;
 		if (copy_from_user(kioc->buf_vaddr, kioc->user_data,
 						pthru32->dataxferlen)) {
 			return (-EFAULT);


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