Patch "IB/core: Fix bit curruption in ib_device_cap_flags structure" has been added to the 4.6-stable tree

Patch "IB/core: Fix bit curruption in ib_device_cap_flags structure" has been added to the 4.6-stable tree

[gregkh]

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

    IB/core: Fix bit curruption in ib_device_cap_flags structure

to the 4.6-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-core-fix-bit-curruption-in-ib_device_cap_flags-structure.patch
and it can be found in the queue-4.6 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 47355b3cd7d3c9c5226bff7c449b9d269fb17fa6 Mon Sep 17 00:00:00 2001
From: Max Gurtovoy <maxg@mellanox.com>
Date: Mon, 6 Jun 2016 19:34:39 +0300
Subject: IB/core: Fix bit curruption in ib_device_cap_flags structure

From: Max Gurtovoy <maxg@mellanox.com>

commit 47355b3cd7d3c9c5226bff7c449b9d269fb17fa6 upstream.

ib_device_cap_flags 64-bit expansion caused caps overlapping
and made consumers read wrong device capabilities. For example
IB_DEVICE_SG_GAPS_REG was falsely read by the iser driver causing
it to use a non-existing capability. This happened because signed
int becomes sign extended when converted it to u64. Fix this by
casting IB_DEVICE_ON_DEMAND_PAGING enumeration to ULL.

Fixes: f5aa9159a418 ('IB/core: Add arbitrary sg_list support')
Reported-by: Robert LeBlanc <robert@leblancnet.us>
Acked-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Max Gurtovoy <maxg@mellanox.com>
Signed-off-by: Matan Barak <matanb@mellanox.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 include/rdma/ib_verbs.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -217,7 +217,7 @@ enum ib_device_cap_flags {
 	IB_DEVICE_CROSS_CHANNEL		= (1 << 27),
 	IB_DEVICE_MANAGED_FLOW_STEERING		= (1 << 29),
 	IB_DEVICE_SIGNATURE_HANDOVER		= (1 << 30),
-	IB_DEVICE_ON_DEMAND_PAGING		= (1 << 31),
+	IB_DEVICE_ON_DEMAND_PAGING		= (1ULL << 31),
 	IB_DEVICE_SG_GAPS_REG			= (1ULL << 32),
 	IB_DEVICE_VIRTUAL_FUNCTION		= ((u64)1 << 33),
 };


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

queue-4.6/ib-core-fix-bit-curruption-in-ib_device_cap_flags-structure.patch