linux-kernel - [PATCH 4.19 18/86] IB/umem: fix reference count leak in ib_umem_odp

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Message-Id: <20200727134915.278101253@linuxfoundation.org>
Date:   Mon, 27 Jul 2020 16:03:52 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yang Yingliang <yangyingliang@...wei.com>
Subject: [PATCH 4.19 18/86] IB/umem: fix reference count leak in ib_umem_odp_get()

From: Yang Yingliang <yangyingliang@...wei.com>

Add missing mmput() on error path to avoid ref-count leak.

This problem is introduced by 79bb5b7ee177 ("RDMA/umem: Fix missing mmap_sem in get umem ODP call")
and resolved by f27a0d50a4bc ("RDMA/umem: Use umem->owning_mm inside ODP").
So, it's only needed in stable-4.14 and stable-4.19.

Fixes: 79bb5b7ee177 ("RDMA/umem: Fix missing mmap_sem in get umem ODP call")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/infiniband/core/umem_odp.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/infiniband/core/umem_odp.c
+++ b/drivers/infiniband/core/umem_odp.c
@@ -356,7 +356,8 @@ int ib_umem_odp_get(struct ib_ucontext *
 		vma = find_vma(mm, ib_umem_start(umem));
 		if (!vma || !is_vm_hugetlb_page(vma)) {
 			up_read(&mm->mmap_sem);
-			return -EINVAL;
+			ret_val = -EINVAL;
+			goto out_mm;
 		}
 		h = hstate_vma(vma);
 		umem->page_shift = huge_page_shift(h);