From 2c16d291236b50f4af83dcdc687ee405c22ad0d3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com>
Date: Thu, 5 Nov 2020 17:06:30 +0100
Subject: [PATCH] Revert "mm: mmap: fix fput in error path v2"
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The kernel test robot is not happy with that.
This reverts commit 0227da01f2559626396af5f6c7453360db86c1f6.
Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Daniel Vetter <daniel@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/394772/
---
drivers/dma-buf/dma-buf.c | 20 +++++++++++++++++---
mm/mmap.c | 2 +-
2 files changed, 18 insertions(+), 4 deletions(-)
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 282bd8b841708..0eb80c1ecdab3 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -1166,6 +1166,9 @@ EXPORT_SYMBOL_GPL(dma_buf_end_cpu_access);
int dma_buf_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma,
unsigned long pgoff)
{
+ struct file *oldfile;
+ int ret;
+
if (WARN_ON(!dmabuf || !vma))
return -EINVAL;
@@ -1183,11 +1186,22 @@ int dma_buf_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma,
return -EINVAL;
/* readjust the vma */
- fput(vma->vm_file);
- vma->vm_file = get_file(dmabuf->file);
+ get_file(dmabuf->file);
+ oldfile = vma->vm_file;
+ vma->vm_file = dmabuf->file;
vma->vm_pgoff = pgoff;
- return dmabuf->ops->mmap(dmabuf, vma);
+ ret = dmabuf->ops->mmap(dmabuf, vma);
+ if (ret) {
+ /* restore old parameters on failure */
+ vma->vm_file = oldfile;
+ fput(dmabuf->file);
+ } else {
+ if (oldfile)
+ fput(oldfile);
+ }
+ return ret;
+
}
EXPORT_SYMBOL_GPL(dma_buf_mmap);
diff --git a/mm/mmap.c b/mm/mmap.c
index 30a4e8412a585..d91ecb00d38cd 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1899,8 +1899,8 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
return addr;
unmap_and_free_vma:
- fput(vma->vm_file);
vma->vm_file = NULL;
+ fput(file);
/* Undo any partial mapping done by a device driver. */
unmap_region(mm, vma, prev, vma->vm_start, vma->vm_end);
--
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