netdev - [PATCH] libceph: Avoid a NULL pointer dereference

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Message-Id: <20190314211724.21306-1-pakki001@umn.edu>
Date:   Thu, 14 Mar 2019 16:17:24 -0500
From:   Aditya Pakki <pakki001@....edu>
To:     pakki001@....edu
Cc:     kjlu@....edu, Ilya Dryomov <idryomov@...il.com>,
        "Yan, Zheng" <zyan@...hat.com>, Sage Weil <sage@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        ceph-devel@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] libceph: Avoid a NULL pointer dereference

kmalloc allocates memory for dest->name and attempts to call
memcpy without a check for failure. This patch avoids such a scenario.

Signed-off-by: Aditya Pakki <pakki001@....edu>
---
 net/ceph/osdmap.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
index 48a31dc9161c..c76a7c7e6a77 100644
--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -1901,6 +1901,8 @@ void ceph_oid_copy(struct ceph_object_id *dest,
 	} else {
 		dest->name = dest->inline_name;
 	}
+	if (!dest->name)
+		return;
 	memcpy(dest->name, src->name, src->name_len + 1);
 	dest->name_len = src->name_len;
 }
-- 
2.17.1