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cifs: fix CIFS_IOC_GET_MNT_INFO oops 

An open directory may have a NULL private_data pointer prior to readdir.

Fixes: 0de1f4c6f6 ("Add way to query server fs info for smb3")
Cc: stable@vger.kernel.org
Signed-off-by: David Disseldorp <ddiss@suse.de>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
David Disseldorp 2017-05-04 00:41:13 +02:00 committed by Steve French
parent b704e70b7c
commit d8a6e505d6
1 changed files with 2 additions and 0 deletions
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2
fs/cifs/ioctl.c
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@ -209,6 +209,8 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
rc = -EOPNOTSUPP;
break;
case CIFS_IOC_GET_MNT_INFO:
if (pSMBFile == NULL)
break;
tcon = tlink_tcon(pSMBFile->tlink);
rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
break;