Commit 60a8744f authored by Sachin Prabhu's avatar Sachin Prabhu Committed by Willy Tarreau

cifs: Check for existing directory when opening file with O_CREAT

commit 8d9535b6 upstream.

When opening a file with O_CREAT flag, check to see if the file opened
is an existing directory.

This prevents the directory from being opened which subsequently causes
a crash when the close function for directories cifs_closedir() is called
which frees up the file->private_data memory while the file is still
listed on the open file list for the tcon.
Signed-off-by: default avatarSachin Prabhu <sprabhu@redhat.com>
Signed-off-by: default avatarSteve French <smfrench@gmail.com>
CC: Stable <stable@vger.kernel.org>
Reported-by: default avatarXiaoli Feng <xifeng@redhat.com>
Signed-off-by: default avatarWilly Tarreau <w@1wt.eu>
parent 9e10c116
......@@ -227,6 +227,13 @@ cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
goto cifs_create_get_file_info;
}
if (S_ISDIR(newinode->i_mode)) {
CIFSSMBClose(xid, tcon, fid->netfid);
iput(newinode);
rc = -EISDIR;
goto out;
}
if (!S_ISREG(newinode->i_mode)) {
/*
* The server may allow us to open things like
......@@ -391,10 +398,14 @@ cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
if (rc != 0) {
cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
rc);
if (server->ops->close)
server->ops->close(xid, tcon, fid);
goto out;
goto out_err;
}
if (S_ISDIR(newinode->i_mode)) {
rc = -EISDIR;
goto out_err;
}
d_drop(direntry);
d_add(direntry, newinode);
......@@ -402,6 +413,13 @@ cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
kfree(buf);
kfree(full_path);
return rc;
out_err:
if (server->ops->close)
server->ops->close(xid, tcon, fid);
if (newinode)
iput(newinode);
goto out;
}
int
......
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