Commit d8a6e505 authored by David Disseldorp's avatar David Disseldorp Committed by Steve French

cifs: fix CIFS_IOC_GET_MNT_INFO oops

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

Fixes: 0de1f4c6 ("Add way to query server fs info for smb3")
Cc: stable@vger.kernel.org
Signed-off-by: default avatarDavid Disseldorp <ddiss@suse.de>
Signed-off-by: default avatarSteve French <smfrench@gmail.com>
parent b704e70b
...@@ -209,6 +209,8 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg) ...@@ -209,6 +209,8 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
rc = -EOPNOTSUPP; rc = -EOPNOTSUPP;
break; break;
case CIFS_IOC_GET_MNT_INFO: case CIFS_IOC_GET_MNT_INFO:
if (pSMBFile == NULL)
break;
tcon = tlink_tcon(pSMBFile->tlink); tcon = tlink_tcon(pSMBFile->tlink);
rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg); rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
break; break;
......
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