From: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
This patch has been added to the 4.1 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit f04a703c3d613845ae3141bfaf223489de8ab3eb ]
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@xxxxxxxxxxxxx>
Signed-off-by: Steve French <smfrench@xxxxxxxxx>
CC: Stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
---
fs/cifs/file.c | 26 ++++++++++++--------------
1 file changed, 12 insertions(+), 14 deletions(-)
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 47e04038a846..1366d2151389 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -3231,20 +3231,18 @@ static 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;
}
@@ -3254,16 +3252,16 @@ 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;
}
--
2.14.1