linux-kernel - [PATCH 5.10 022/137] nvme-rdma: fix in-casule data send for chained sgls

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210608175943.167114424@linuxfoundation.org>
Date:   Tue,  8 Jun 2021 20:26:02 +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,
        "Walker, Benjamin" <benjamin.walker@...el.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Max Gurtovoy <mgurtovoy@...dia.com>,
        Christoph Hellwig <hch@....de>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 022/137] nvme-rdma: fix in-casule data send for chained sgls

From: Sagi Grimberg <sagi@...mberg.me>

[ Upstream commit 12b2aaadb6d5ef77434e8db21f469f46fe2d392e ]

We have only 2 inline sg entries and we allow 4 sg entries for the send
wr sge. Larger sgls entries will be chained. However when we build
in-capsule send wr sge, we iterate without taking into account that the
sgl may be chained and still fit in-capsule (which can happen if the sgl
is bigger than 2, but lower-equal to 4).

Fix in-capsule data mapping to correctly iterate chained sgls.

Fixes: 38e1800275d3 ("nvme-rdma: Avoid preallocating big SGL for data")
Reported-by: Walker, Benjamin <benjamin.walker@...el.com>
Signed-off-by: Sagi Grimberg <sagi@...mberg.me>
Reviewed-by: Max Gurtovoy <mgurtovoy@...dia.com>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/host/rdma.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index 8b326508a480..e6d58402b829 100644
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -1327,16 +1327,17 @@ static int nvme_rdma_map_sg_inline(struct nvme_rdma_queue *queue,
 		int count)
 {
 	struct nvme_sgl_desc *sg = &c->common.dptr.sgl;
-	struct scatterlist *sgl = req->data_sgl.sg_table.sgl;
 	struct ib_sge *sge = &req->sge[1];
+	struct scatterlist *sgl;
 	u32 len = 0;
 	int i;
 
-	for (i = 0; i < count; i++, sgl++, sge++) {
+	for_each_sg(req->data_sgl.sg_table.sgl, sgl, count, i) {
 		sge->addr = sg_dma_address(sgl);
 		sge->length = sg_dma_len(sgl);
 		sge->lkey = queue->device->pd->local_dma_lkey;
 		len += sge->length;
+		sge++;
 	}
 
 	sg->addr = cpu_to_le64(queue->ctrl->ctrl.icdoff);
-- 
2.30.2