Patch "libceph: add an ONSTACK initializer for oids" has been added to the 4.7-stable tree

Patch "libceph: add an ONSTACK initializer for oids" has been added to the 4.7-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    libceph: add an ONSTACK initializer for oids

to the 4.7-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     libceph-add-an-onstack-initializer-for-oids.patch
and it can be found in the queue-4.7 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 281dbe5db81c6137def9757e07a7aea14b1ed86e Mon Sep 17 00:00:00 2001
From: Ilya Dryomov <idryomov@gmail.com>
Date: Tue, 26 Jul 2016 15:22:35 +0200
Subject: libceph: add an ONSTACK initializer for oids

From: Ilya Dryomov <idryomov@gmail.com>

commit 281dbe5db81c6137def9757e07a7aea14b1ed86e upstream.

An on-stack oid in ceph_ioctl_get_dataloc() is not initialized,
resulting in a WARN and a NULL pointer dereference later on.  We will
have more of these on-stack in the future, so fix it with a convenience
macro.

Fixes: d30291b985d1 ("libceph: variable-sized ceph_object_id")
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/ceph/ioctl.c             |    2 +-
 include/linux/ceph/osdmap.h |    5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

--- a/fs/ceph/ioctl.c
+++ b/fs/ceph/ioctl.c
@@ -183,7 +183,7 @@ static long ceph_ioctl_get_dataloc(struc
 	struct ceph_osd_client *osdc =
 		&ceph_sb_to_client(inode->i_sb)->client->osdc;
 	struct ceph_object_locator oloc;
-	struct ceph_object_id oid;
+	CEPH_DEFINE_OID_ONSTACK(oid);
 	u64 len = 1, olen;
 	u64 tmp;
 	struct ceph_pg pgid;
--- a/include/linux/ceph/osdmap.h
+++ b/include/linux/ceph/osdmap.h
@@ -115,6 +115,11 @@ static inline void ceph_oid_init(struct
 	oid->name_len = 0;
 }
 
+#define CEPH_OID_INIT_ONSTACK(oid)					\
+    ({ ceph_oid_init(&oid); oid; })
+#define CEPH_DEFINE_OID_ONSTACK(oid)					\
+	struct ceph_object_id oid = CEPH_OID_INIT_ONSTACK(oid)
+
 static inline bool ceph_oid_empty(const struct ceph_object_id *oid)
 {
 	return oid->name == oid->inline_name && !oid->name_len;


Patches currently in stable-queue which might be from idryomov@gmail.com are

queue-4.7/ceph-fix-symbol-versioning-for-ceph_monc_do_statfs.patch
queue-4.7/libceph-fix-return-value-check-in-alloc_msg_with_page_vector.patch
queue-4.7/libceph-add-an-onstack-initializer-for-oids.patch