As with 618763958b22, an open directory may have a NULL private_data
pointer prior to readdir. CIFS_ENUMERATE_SNAPSHOTS must check for this
before dereference.
Fixes: 834170c85978 ("Enable previous version support")
Signed-off-by: David Disseldorp <ddiss@xxxxxxx>
---
fs/cifs/ioctl.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/cifs/ioctl.c b/fs/cifs/ioctl.c
index 7f4bba574930..4d598a71cf84 100644
--- a/fs/cifs/ioctl.c
+++ b/fs/cifs/ioctl.c
@@ -213,6 +213,8 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
break;
case CIFS_ENUMERATE_SNAPSHOTS:
+ if (pSMBFile == NULL)
+ break;
if (arg == 0) {
rc = -EINVAL;
goto cifs_ioc_exit;
--
2.12.0
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