linux-kernel - [PATCH 5.4 088/178] RDMA/mad: Fix possible memory leak in ib_mad_post_receive

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Message-Id: <20200629152523.2494198-89-sashal@kernel.org>
Date:   Mon, 29 Jun 2020 11:23:53 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Fan Guo <guofan5@...wei.com>, Jason Gunthorpe <jgg@...lanox.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 088/178] RDMA/mad: Fix possible memory leak in ib_mad_post_receive_mads()

From: Fan Guo <guofan5@...wei.com>

[ Upstream commit a17f4bed811c60712d8131883cdba11a105d0161 ]

If ib_dma_mapping_error() returns non-zero value,
ib_mad_post_receive_mads() will jump out of loops and return -ENOMEM
without freeing mad_priv. Fix this memory-leak problem by freeing mad_priv
in this case.

Fixes: 2c34e68f4261 ("IB/mad: Check and handle potential DMA mapping errors")
Link: https://lore.kernel.org/r/20200612063824.180611-1-guofan5@huawei.com
Signed-off-by: Fan Guo <guofan5@...wei.com>
Signed-off-by: Jason Gunthorpe <jgg@...lanox.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/infiniband/core/mad.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/infiniband/core/mad.c b/drivers/infiniband/core/mad.c
index a9e00cdf717b8..2284930b5f915 100644
--- a/drivers/infiniband/core/mad.c
+++ b/drivers/infiniband/core/mad.c
@@ -2960,6 +2960,7 @@ static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
 						 DMA_FROM_DEVICE);
 		if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device,
 						  sg_list.addr))) {
+			kfree(mad_priv);
 			ret = -ENOMEM;
 			break;
 		}
-- 
2.25.1