linux-kernel - [PATCH 4.4 143/268] RDMA/ucma: Correct option size check using optlen

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Date:   Mon, 28 May 2018 12:01:57 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Chien Tin Tung <chien.tin.tung@...el.com>,
        Shiraz Saleem <shiraz.saleem@...el.com>,
        Leon Romanovsky <leonro@...lanox.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.4 143/268] RDMA/ucma: Correct option size check using optlen

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

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

From: Chien Tin Tung <chien.tin.tung@...el.com>

[ Upstream commit 5f3e3b85cc0a5eae1c46d72e47d3de7bf208d9e2 ]

The option size check is using optval instead of optlen
causing the set option call to fail. Use the correct
field, optlen, for size check.

Fixes: 6a21dfc0d0db ("RDMA/ucma: Limit possible option size")
Signed-off-by: Chien Tin Tung <chien.tin.tung@...el.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@...el.com>
Reviewed-by: Leon Romanovsky <leonro@...lanox.com>
Signed-off-by: Jason Gunthorpe <jgg@...lanox.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/infiniband/core/ucma.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -1295,7 +1295,7 @@ static ssize_t ucma_set_option(struct uc
 	if (IS_ERR(ctx))
 		return PTR_ERR(ctx);
 
-	if (unlikely(cmd.optval > KMALLOC_MAX_SIZE))
+	if (unlikely(cmd.optlen > KMALLOC_MAX_SIZE))
 		return -EINVAL;
 
 	optval = memdup_user((void __user *) (unsigned long) cmd.optval,