This is a note to let you know that I've just added the patch titled
cifs: Fix missing put_xid in cifs_file_strict_mmap
to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: cifs-fix-missing-put_xid-in-cifs_file_strict_mmap.patch and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From f04a703c3d613845ae3141bfaf223489de8ab3eb Mon Sep 17 00:00:00 2001
From: Matthew Wilcox mawilcox@microsoft.com Date: Fri, 15 Dec 2017 12:48:32 -0800 Subject: cifs: Fix missing put_xid in cifs_file_strict_mmap
From: Matthew Wilcox mawilcox@microsoft.com
commit f04a703c3d613845ae3141bfaf223489de8ab3eb upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/cifs/file.c | 26 ++++++++++++-------------- 1 file changed, 12 insertions(+), 14 deletions(-)
--- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -3285,20 +3285,18 @@ static const struct vm_operations_struct
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; } @@ -3308,16 +3306,16 @@ int cifs_file_mmap(struct file *file, st 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; }
Patches currently in stable-queue which might be from mawilcox@microsoft.com are
queue-4.9/cifs-fix-missing-put_xid-in-cifs_file_strict_mmap.patch