From: Chien Tin Tung <chien.tin.tung@intel.com>
Date: Wed, 21 Mar 2018 18:09:25 +0000 (-0500)
Subject: RDMA/ucma: Correct option size check using optlen
X-Git-Tag: v4.14.45~221
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7245e2d1790b4dbcaf318c36b87758d568e67f8b;p=platform%2Fkernel%2Flinux-exynos.git

RDMA/ucma: Correct option size check using optlen

[ 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@intel.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
index c65f0e8..e47baf0 100644
--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -1315,7 +1315,7 @@ static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf,
 	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,