linux-kernel - [PATCH 4.19 64/86] RDMA/mlx4: Dont continue event handler after memory allocation failure

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Message-Id: <20220207103759.661417834@linuxfoundation.org>
Date:   Mon,  7 Feb 2022 12:06:27 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Leon Romanovsky <leonro@...dia.com>,
        Håkon Bugge <haakon.bugge@...cle.com>,
        Jason Gunthorpe <jgg@...dia.com>
Subject: [PATCH 4.19 64/86] RDMA/mlx4: Dont continue event handler after memory allocation failure

From: Leon Romanovsky <leonro@...dia.com>

commit f3136c4ce7acf64bee43135971ca52a880572e32 upstream.

The failure to allocate memory during MLX4_DEV_EVENT_PORT_MGMT_CHANGE
event handler will cause skip the assignment logic, but
ib_dispatch_event() will be called anyway.

Fix it by calling to return instead of break after memory allocation
failure.

Fixes: 00f5ce99dc6e ("mlx4: Use port management change event instead of smp_snoop")
Link: https://lore.kernel.org/r/12a0e83f18cfad4b5f62654f141e240d04915e10.1643622264.git.leonro@nvidia.com
Signed-off-by: Leon Romanovsky <leonro@...dia.com>
Reviewed-by: Håkon Bugge <haakon.bugge@...cle.com>
Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/infiniband/hw/mlx4/main.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -3351,7 +3351,7 @@ static void mlx4_ib_event(struct mlx4_de
 	case MLX4_DEV_EVENT_PORT_MGMT_CHANGE:
 		ew = kmalloc(sizeof *ew, GFP_ATOMIC);
 		if (!ew)
-			break;
+			return;
 
 		INIT_WORK(&ew->work, handle_port_mgmt_change_event);
 		memcpy(&ew->ib_eqe, eqe, sizeof *eqe);