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cifs: don't call cifs_new_fileinfo unless cifs_open succeeds

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It's currently possible for cifs_open to fail after it has already
called cifs_new_fileinfo. In that situation, the new fileinfo will be
leaked as the caller doesn't call fput. That in turn leads to a busy
inodes after umount problem since the fileinfo holds an extra inode
reference now. Shuffle cifs_open around a bit so that it only calls
cifs_new_fileinfo if it's going to succeed.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reviewed-and-Tested-by: Suresh Jayaraman <sjayaraman@suse.de>
This commit is contained in:
Jeff Layton 2010-06-16 13:40:17 -04:00
parent d9d5d8df95
commit 47c78b7f40
1 changed files with 11 additions and 6 deletions
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17
fs/cifs/file.c
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@ -268,17 +268,20 @@ int cifs_open(struct inode *inode, struct file *file)
/* no need for special case handling of setting mode
on read only files needed here */
rc = cifs_posix_open_inode_helper(inode, file,
pCifsInode, oplock, netfid);
if (rc != 0) {
CIFSSMBClose(xid, tcon, netfid);
goto out;
}
pCifsFile = cifs_new_fileinfo(inode, netfid, file,
file->f_path.mnt,
oflags);
if (pCifsFile == NULL) {
CIFSSMBClose(xid, tcon, netfid);
rc = -ENOMEM;
goto out;
}
rc = cifs_posix_open_inode_helper(inode, file,
pCifsInode, oplock, netfid);
goto out;
} else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
if (tcon->ses->serverNOS)
@ -359,6 +362,10 @@ int cifs_open(struct inode *inode, struct file *file)
goto out;
}
rc = cifs_open_inode_helper(inode, tcon, &oplock, buf, full_path, xid);
if (rc != 0)
goto out;
pCifsFile = cifs_new_fileinfo(inode, netfid, file, file->f_path.mnt,
file->f_flags);
if (pCifsFile == NULL) {
@ -366,8 +373,6 @@ int cifs_open(struct inode *inode, struct file *file)
goto out;
}
rc = cifs_open_inode_helper(inode, tcon, &oplock, buf, full_path, xid);
if (oplock & CIFS_CREATE_ACTION) {
/* time to set mode which we can not set earlier due to
problems creating new read-only files */