Patch "IB/umem: Fix use of npages/nmap fields" has been added to the 4.9-stable tree

Patch "IB/umem: Fix use of npages/nmap fields" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    IB/umem: Fix use of npages/nmap fields

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     ib-umem-fix-use-of-npages-nmap-fields.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Mar 22 14:40:24 CET 2018
From: Artemy Kovalyov <artemyko@mellanox.com>
Date: Tue, 14 Nov 2017 14:51:59 +0200
Subject: IB/umem: Fix use of npages/nmap fields

From: Artemy Kovalyov <artemyko@mellanox.com>


[ Upstream commit edf1a84fe37c51290e2c88154ecaf48dadff3d27 ]

In ib_umem structure npages holds original number of sg entries, while
nmap is number of DMA blocks returned by dma_map_sg.

Fixes: c5d76f130b28 ('IB/core: Add umem function to read data from user-space')
Signed-off-by: Artemy Kovalyov <artemyko@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
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>
---
 drivers/infiniband/core/umem.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -357,7 +357,7 @@ int ib_umem_copy_from(void *dst, struct
 		return -EINVAL;
 	}
 
-	ret = sg_pcopy_to_buffer(umem->sg_head.sgl, umem->nmap, dst, length,
+	ret = sg_pcopy_to_buffer(umem->sg_head.sgl, umem->npages, dst, length,
 				 offset + ib_umem_offset(umem));
 
 	if (ret < 0)


Patches currently in stable-queue which might be from artemyko@mellanox.com are

queue-4.9/ib-umem-fix-use-of-npages-nmap-fields.patch