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

IB/mlx5: Fix mlx5_ib_alloc_mr error flow

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: ib-mlx5-fix-mlx5_ib_alloc_mr-error-flow.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 Wed Feb 28 16:13:29 CET 2018

From: Nitzan Carmi nitzanc@mellanox.com Date: Tue, 26 Dec 2017 11:20:20 +0200 Subject: IB/mlx5: Fix mlx5_ib_alloc_mr error flow

From: Nitzan Carmi nitzanc@mellanox.com

[ Upstream commit 45e6ae7ef21b907dacb18da62d5787d74a31d860 ]

ibmr.device is being set only after ib_alloc_mr() is (successfully) complete. Therefore, in case mlx5_core_create_mkey() return with error, the error flow calls mlx5_free_priv_descs() which uses ibmr.device (which doesn't exist yet), causing a NULL dereference oops.

To fix this, the IB device should be set in the mr struct earlier stage (e.g. prior to calling mlx5_core_create_mkey()).

Fixes: 8a187ee52b04 ("IB/mlx5: Support the new memory registration API") Signed-off-by: Max Gurtovoy maxg@mellanox.com Signed-off-by: Nitzan Carmi nitzanc@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/hw/mlx5/mr.c | 1 + 1 file changed, 1 insertion(+)

--- a/drivers/infiniband/hw/mlx5/mr.c +++ b/drivers/infiniband/hw/mlx5/mr.c @@ -1648,6 +1648,7 @@ struct ib_mr *mlx5_ib_alloc_mr(struct ib MLX5_SET(mkc, mkc, access_mode, mr->access_mode); MLX5_SET(mkc, mkc, umr_en, 1);

+ mr->ibmr.device = pd->device; err = mlx5_core_create_mkey(dev->mdev, &mr->mmkey, in, inlen); if (err) goto err_destroy_psv;

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

queue-4.9/ib-mlx5-fix-mlx5_ib_alloc_mr-error-flow.patch queue-4.9/ib-mlx4-fix-mlx4_ib_alloc_mr-error-flow.patch