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* [PATCH] IB/mlx4: Fix memory leaks
@ 2019-08-18 20:23 Wenwen Wang
  2019-08-19 11:56 ` Leon Romanovsky
  2019-08-20 17:18 ` Doug Ledford
  0 siblings, 2 replies; 3+ messages in thread
From: Wenwen Wang @ 2019-08-18 20:23 UTC (permalink / raw)
  To: Wenwen Wang
  Cc: Yishai Hadas, Doug Ledford, Jason Gunthorpe, linux-rdma, linux-kernel

In mlx4_ib_alloc_pv_bufs(), 'tun_qp->tx_ring' is allocated through
kcalloc(). However, it is not always deallocated in the following execution
if an error occurs, leading to memory leaks. To fix this issue, free
'tun_qp->tx_ring' whenever an error occurs.

Signed-off-by: Wenwen Wang <wenwen@cs.uga.edu>
---
 drivers/infiniband/hw/mlx4/mad.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/mlx4/mad.c b/drivers/infiniband/hw/mlx4/mad.c
index 68c9514..5707911 100644
--- a/drivers/infiniband/hw/mlx4/mad.c
+++ b/drivers/infiniband/hw/mlx4/mad.c
@@ -1677,8 +1677,6 @@ static int mlx4_ib_alloc_pv_bufs(struct mlx4_ib_demux_pv_ctx *ctx,
 				    tx_buf_size, DMA_TO_DEVICE);
 		kfree(tun_qp->tx_ring[i].buf.addr);
 	}
-	kfree(tun_qp->tx_ring);
-	tun_qp->tx_ring = NULL;
 	i = MLX4_NUM_TUNNEL_BUFS;
 err:
 	while (i > 0) {
@@ -1687,6 +1685,8 @@ static int mlx4_ib_alloc_pv_bufs(struct mlx4_ib_demux_pv_ctx *ctx,
 				    rx_buf_size, DMA_FROM_DEVICE);
 		kfree(tun_qp->ring[i].addr);
 	}
+	kfree(tun_qp->tx_ring);
+	tun_qp->tx_ring = NULL;
 	kfree(tun_qp->ring);
 	tun_qp->ring = NULL;
 	return -ENOMEM;
-- 
2.7.4


^ permalink raw reply	[flat|nested] 3+ messages in thread

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2019-08-18 20:23 [PATCH] IB/mlx4: Fix memory leaks Wenwen Wang
2019-08-19 11:56 ` Leon Romanovsky
2019-08-20 17:18 ` Doug Ledford

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