linux-kernel - [PATCH 5.0 71/89] rdma: fix build errors on s390 and MIPS due to bad ZERO

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Date:   Tue, 30 Apr 2019 13:39:02 +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, Andrea Arcangeli <aarcange@...hat.com>,
        Leon Romanovsky <leonro@...lanox.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 5.0 71/89] rdma: fix build errors on s390 and MIPS due to bad ZERO_PAGE use

From: Linus Torvalds <torvalds@...ux-foundation.org>

commit 6a5c5d26c4c6c3cc486fef0bf04ff9551132611b upstream.

The parameter to ZERO_PAGE() was wrong, but since all architectures
except for MIPS and s390 ignore it, it wasn't noticed until 0-day
reported the build error.

Fixes: 67f269b37f9b ("RDMA/ucontext: Fix regression with disassociate")
Cc: stable@...r.kernel.org
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Leon Romanovsky <leonro@...lanox.com>
Cc: Jason Gunthorpe <jgg@...lanox.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/infiniband/core/uverbs_main.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -894,7 +894,7 @@ static vm_fault_t rdma_umap_fault(struct
 
 	/* Read only pages can just use the system zero page. */
 	if (!(vmf->vma->vm_flags & (VM_WRITE | VM_MAYWRITE))) {
-		vmf->page = ZERO_PAGE(vmf->vm_start);
+		vmf->page = ZERO_PAGE(vmf->address);
 		get_page(vmf->page);
 		return 0;
 	}