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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Gerd Rausch <gerd.rausch@oracle.com>,
	Santosh Shilimkar <santosh.shilimkar@oracle.com>,
	Jakub Kicinski <kuba@kernel.org>, Sasha Levin <sashal@kernel.org>,
	netdev@vger.kernel.org, linux-rdma@vger.kernel.org,
	rds-devel@oss.oracle.com
Subject: [PATCH AUTOSEL 5.13 25/26] net/rds: dma_map_sg is entitled to merge entries
Date: Mon, 23 Aug 2021 20:53:55 -0400	[thread overview]
Message-ID: <20210824005356.630888-25-sashal@kernel.org> (raw)
In-Reply-To: <20210824005356.630888-1-sashal@kernel.org>

From: Gerd Rausch <gerd.rausch@oracle.com>

[ Upstream commit fb4b1373dcab086d0619c29310f0466a0b2ceb8a ]

Function "dma_map_sg" is entitled to merge adjacent entries
and return a value smaller than what was passed as "nents".

Subsequently "ib_map_mr_sg" needs to work with this value ("sg_dma_len")
rather than the original "nents" parameter ("sg_len").

This old RDS bug was exposed and reliably causes kernel panics
(using RDMA operations "rds-stress -D") on x86_64 starting with:
commit c588072bba6b ("iommu/vt-d: Convert intel iommu driver to the iommu ops")

Simply put: Linux 5.11 and later.

Signed-off-by: Gerd Rausch <gerd.rausch@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Link: https://lore.kernel.org/r/60efc69f-1f35-529d-a7ef-da0549cad143@oracle.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/rds/ib_frmr.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/rds/ib_frmr.c b/net/rds/ib_frmr.c
index 9b6ffff72f2d..28c1b0022178 100644
--- a/net/rds/ib_frmr.c
+++ b/net/rds/ib_frmr.c
@@ -131,9 +131,9 @@ static int rds_ib_post_reg_frmr(struct rds_ib_mr *ibmr)
 		cpu_relax();
 	}
 
-	ret = ib_map_mr_sg_zbva(frmr->mr, ibmr->sg, ibmr->sg_len,
+	ret = ib_map_mr_sg_zbva(frmr->mr, ibmr->sg, ibmr->sg_dma_len,
 				&off, PAGE_SIZE);
-	if (unlikely(ret != ibmr->sg_len))
+	if (unlikely(ret != ibmr->sg_dma_len))
 		return ret < 0 ? ret : -EINVAL;
 
 	if (cmpxchg(&frmr->fr_state,
-- 
2.30.2


  parent reply	other threads:[~2021-08-24  0:56 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-24  0:53 [PATCH AUTOSEL 5.13 01/26] iwlwifi: pnvm: accept multiple HW-type TLVs Sasha Levin
2021-08-24  0:53 ` [PATCH AUTOSEL 5.13 02/26] iwlwifi: add new SoF with JF devices Sasha Levin
2021-08-24  0:53 ` [PATCH AUTOSEL 5.13 03/26] iwlwifi: add new so-jf devices Sasha Levin
2021-08-24  0:53 ` [PATCH AUTOSEL 5.13 04/26] opp: remove WARN when no valid OPPs remain Sasha Levin
2021-08-24  0:53 ` [PATCH AUTOSEL 5.13 05/26] cpufreq: blocklist Qualcomm sm8150 in cpufreq-dt-platdev Sasha Levin
2021-08-24  0:53 ` [PATCH AUTOSEL 5.13 06/26] virtio: Improve vq->broken access to avoid any compiler optimization Sasha Levin
2021-08-24  0:53 ` [PATCH AUTOSEL 5.13 07/26] virtio_pci: Support surprise removal of virtio pci device Sasha Levin
2021-08-24  0:53 ` [PATCH AUTOSEL 5.13 08/26] virtio_vdpa: reject invalid vq indices Sasha Levin
2021-08-24  0:53 ` [PATCH AUTOSEL 5.13 09/26] vringh: Use wiov->used to check for read/write desc order Sasha Levin
2021-08-24  0:53 ` [PATCH AUTOSEL 5.13 10/26] tools/virtio: fix build Sasha Levin
2021-08-24  0:53 ` [PATCH AUTOSEL 5.13 11/26] platform/x86: asus-nb-wmi: Allow configuring SW_TABLET_MODE method with a module option Sasha Levin
2021-08-24  0:53 ` [PATCH AUTOSEL 5.13 12/26] platform/x86: asus-nb-wmi: Add tablet_mode_sw=lid-flip quirk for the TP200s Sasha Levin
2021-08-24  0:53 ` [PATCH AUTOSEL 5.13 13/26] qed: qed ll2 race condition fixes Sasha Levin
2021-08-24  0:53 ` [PATCH AUTOSEL 5.13 14/26] qed: Fix null-pointer dereference in qed_rdma_create_qp() Sasha Levin
2021-08-24  0:53 ` [PATCH AUTOSEL 5.13 15/26] Revert "drm/amd/pm: fix workload mismatch on vega10" Sasha Levin
2021-08-24  0:53 ` [PATCH AUTOSEL 5.13 16/26] drm/amd/pm: change the workload type for some cards Sasha Levin
2021-08-24  0:53 ` [PATCH AUTOSEL 5.13 17/26] blk-mq: don't grab rq's refcount in blk_mq_check_expired() Sasha Levin
2021-08-24  0:53 ` [PATCH AUTOSEL 5.13 18/26] drm: Copy drm_wait_vblank to user before returning Sasha Levin
2021-08-24  0:53 ` [PATCH AUTOSEL 5.13 19/26] platform/x86: gigabyte-wmi: add support for X570 GAMING X Sasha Levin
2021-08-24  0:53 ` [PATCH AUTOSEL 5.13 20/26] drm/nouveau: recognise GA107 Sasha Levin
2021-08-24 17:08   ` Lyude Paul
2021-08-30 12:17     ` Sasha Levin
2021-08-30 17:08       ` Lyude Paul
2021-08-30 17:09         ` Lyude Paul
2021-08-30 21:55           ` Sasha Levin
2021-08-24  0:53 ` [PATCH AUTOSEL 5.13 21/26] drm/nouveau/disp: power down unused DP links during init Sasha Levin
2021-08-24  0:53 ` [PATCH AUTOSEL 5.13 22/26] drm/nouveau/kms/nv50: workaround EFI GOP window channel format differences Sasha Levin
2021-08-24  0:53 ` [PATCH AUTOSEL 5.13 23/26] drm/nouveau: block a bunch of classes from userspace Sasha Levin
2021-08-24  0:53 ` [PATCH AUTOSEL 5.13 24/26] platform/x86: gigabyte-wmi: add support for B450M S2H V2 Sasha Levin
2021-08-24  0:53 ` Sasha Levin [this message]
2021-08-24  0:53 ` [PATCH AUTOSEL 5.13 26/26] arm64: initialize all of CNTHCTL_EL2 Sasha Levin

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