Return-Path: From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Artemy Kovalyov , Leon Romanovsky , Jason Gunthorpe , Sasha Levin Subject: [PATCH AUTOSEL for 4.9 173/190] IB/umem: Fix use of npages/nmap fields Date: Thu, 8 Mar 2018 05:00:09 +0000 Message-ID: <20180308045810.8041-173-alexander.levin@microsoft.com> References: <20180308045810.8041-1-alexander.levin@microsoft.com> In-Reply-To: <20180308045810.8041-1-alexander.levin@microsoft.com> Content-Language: en-US Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: From: Artemy Kovalyov [ 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-spa= ce') Signed-off-by: Artemy Kovalyov Signed-off-by: Leon Romanovsky Signed-off-by: Jason Gunthorpe Signed-off-by: Sasha Levin --- drivers/infiniband/core/umem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.= c index 8e973a2993a6..e74aa1d60fdb 100644 --- a/drivers/infiniband/core/umem.c +++ b/drivers/infiniband/core/umem.c @@ -357,7 +357,7 @@ int ib_umem_copy_from(void *dst, struct ib_umem *umem, = size_t offset, return -EINVAL; } =20 - ret =3D sg_pcopy_to_buffer(umem->sg_head.sgl, umem->nmap, dst, length, + ret =3D sg_pcopy_to_buffer(umem->sg_head.sgl, umem->npages, dst, length, offset + ib_umem_offset(umem)); =20 if (ret < 0) --=20 2.14.1