linux-kernel - [PATCH 3.12 019/103] SCSI: megaraid: missing bounds check in mimd_to

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Message-Id: <ef57e93eaa37b483191b5949b816d22ae441b45a.1401371259.git.jslaby@suse.cz>
Date:	Thu, 29 May 2014 15:48:04 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Dan Carpenter <dan.carpenter@...cle.com>,
	James Bottomley <JBottomley@...allels.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 019/103] SCSI: megaraid: missing bounds check in mimd_to_kioc()

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

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

===============

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: Jiri Slaby <jslaby@...e.cz>
---
 drivers/scsi/megaraid/megaraid_mm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/scsi/megaraid/megaraid_mm.c b/drivers/scsi/megaraid/megaraid_mm.c
index dfffd0f37916..a70692779a16 100644
--- 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_mmadp_t *adp, uioc_t *kioc)
 
 	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);
-- 
1.9.3

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