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cifs: Fix missing put_xid in cifs_file_strict_mmap 

If cifs_zap_mapping() returned an error, we would return without putting
the xid that we got earlier.  Restructure cifs_file_strict_mmap() and
cifs_file_mmap() to be more similar to each other and have a single
point of return that always puts the xid.

Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: Steve French <smfrench@gmail.com>
CC: Stable <stable@vger.kernel.org>
This commit is contained in:
Matthew Wilcox 2017-12-15 12:48:32 -08:00 committed by Steve French
parent d8ec913b17
commit f04a703c3d
1 changed files with 12 additions and 14 deletions
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26
fs/cifs/file.c
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@ -3471,20 +3471,18 @@ static const struct vm_operations_struct cifs_file_vm_ops = {
int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma)
{
int rc, xid;
int xid, rc = 0;
struct inode *inode = file_inode(file);
xid = get_xid();
if (!CIFS_CACHE_READ(CIFS_I(inode))) {
if (!CIFS_CACHE_READ(CIFS_I(inode)))
rc = cifs_zap_mapping(inode);
if (rc)
return rc;
}
rc = generic_file_mmap(file, vma);
if (rc == 0)
if (!rc)
rc = generic_file_mmap(file, vma);
if (!rc)
vma->vm_ops = &cifs_file_vm_ops;
free_xid(xid);
return rc;
}
@ -3494,16 +3492,16 @@ int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
int rc, xid;
xid = get_xid();
rc = cifs_revalidate_file(file);
if (rc) {
if (rc)
cifs_dbg(FYI, "Validation prior to mmap failed, error=%d\n",
rc);
free_xid(xid);
return rc;
}
rc = generic_file_mmap(file, vma);
if (rc == 0)
if (!rc)
rc = generic_file_mmap(file, vma);
if (!rc)
vma->vm_ops = &cifs_file_vm_ops;
free_xid(xid);
return rc;
}