Commit 2896900e authored by Christian König's avatar Christian König Committed by Linus Torvalds

ovl: fix reference counting in ovl_mmap error path

mmap_region() now calls fput() on the vma->vm_file.

Fix this by using vma_set_file() so it doesn't need to be handled
manually here any more.

Link: https://lkml.kernel.org/r/20210421132012.82354-2-christian.koenig@amd.com
Fixes: 1527f926 ("mm: mmap: fix fput in error path v2")
Signed-off-by: default avatarChristian König <christian.koenig@amd.com>
Reviewed-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Cc: Jan Harkes <jaharkes@cs.cmu.edu>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: <stable@vger.kernel.org>	[5.11+]
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 9da29c7f
...@@ -430,20 +430,11 @@ static int ovl_mmap(struct file *file, struct vm_area_struct *vma) ...@@ -430,20 +430,11 @@ static int ovl_mmap(struct file *file, struct vm_area_struct *vma)
if (WARN_ON(file != vma->vm_file)) if (WARN_ON(file != vma->vm_file))
return -EIO; return -EIO;
vma->vm_file = get_file(realfile); vma_set_file(vma, realfile);
old_cred = ovl_override_creds(file_inode(file)->i_sb); old_cred = ovl_override_creds(file_inode(file)->i_sb);
ret = call_mmap(vma->vm_file, vma); ret = call_mmap(vma->vm_file, vma);
revert_creds(old_cred); revert_creds(old_cred);
if (ret) {
/* Drop reference count from new vm_file value */
fput(realfile);
} else {
/* Drop reference count from previous vm_file value */
fput(file);
}
ovl_file_accessed(file); ovl_file_accessed(file);
return ret; return ret;
......
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