[PATCH 3.18 012/145] ping: fix a null pointer dereference

3.18-stable review patch. If anyone has any objections, please let me know. -- From: WANG Cong [ Upstream commit 73d2c6678e6c3af7e7a42b1e78cd0211782ade32 ] Andrey reported a kernel crash: general protection fault: [#1] SMP KASAN Dumping

[PATCH 3.18 012/145] ping: fix a null pointer dereference

3.18-stable review patch. If anyone has any objections, please let me know. -- From: WANG Cong [ Upstream commit 73d2c6678e6c3af7e7a42b1e78cd0211782ade32 ] Andrey reported a kernel crash: general protection fault: [#1] SMP KASAN Dumping ftrace buffer: (ftrace