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Subject[PATCH 4.10 69/93] cifs: fix CIFS_IOC_GET_MNT_INFO oops
Date
4.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Disseldorp <ddiss@suse.de>

commit d8a6e505d6bba2250852fbc1c1c86fe68aaf9af3 upstream.

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

Fixes: 0de1f4c6f6c0 ("Add way to query server fs info for smb3")
Signed-off-by: David Disseldorp <ddiss@suse.de>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/cifs/ioctl.c | 2 ++
1 file changed, 2 insertions(+)

--- a/fs/cifs/ioctl.c
+++ b/fs/cifs/ioctl.c
@@ -264,6 +264,8 @@ long cifs_ioctl(struct file *filep, unsi
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;

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