cifs: fix CIFS_ENUMERATE_SNAPSHOTS oops
authorDavid Disseldorp <ddiss@suse.de>
Wed, 3 May 2017 15:39:08 +0000 (17:39 +0200)
committerSteve French <smfrench@gmail.com>
Wed, 3 May 2017 14:59:20 +0000 (09:59 -0500)
commit6026685de33b0db5b2b6b0e9b41b3a1a3261033c
tree01c0c2fcf7cc95eb8c29b3664e54addf146a5987
parent0e5c795592930d51fd30d53a2e7b73cba022a29b
cifs: fix CIFS_ENUMERATE_SNAPSHOTS oops

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@suse.de>
CC: Stable <stable@vger.kernel.org>
Signed-off-by: Steve French <smfrench@gmail.com>
fs/cifs/ioctl.c