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Date: Sun, 15 May 2016 11:04:28 +0800 From: Baozeng Ding <sploving1@...il.com> To: Eric Dumazet <eric.dumazet@...il.com> Cc: jon.maloy@...csson.com, ying.xue@...driver.com, davem@...emloft.net, netdev@...r.kernel.org, tipc-discussion@...ts.sourceforge.net Subject: Re: BUG: net/tipc: NULL-ptr dereference in tipc_nl_publ_dump On 2016/5/15 1:13, Eric Dumazet wrote: > On Sat, 2016-05-14 at 23:22 +0800, Baozeng Ding wrote: >> Hello all, >> The following program triggers NULL-ptr dereference in >> tipc_nl_publ_dump. The kernel version is 4.6.0-rc7+ (on May 13 commit >> 1410b74e4061e05a5d2bffb1f99829efce27c8a9). Thanks. >> ---------------------------------------------------------------------------------- >> netlink: 1 bytes leftover after parsing attributes in process >> `syz-executor'. >> kasan: CONFIG_KASAN_INLINE enabled >> kasan: GPF could be caused by NULL-ptr deref or user memory >> accessgeneral protection fault: 0000 [#1] SMP KASAN >> Modules linked in: >> CPU: 2 PID: 1346 Comm: syz-executor Not tainted 4.6.0-rc7+ #2 >> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS >> Ubuntu-1.8.2-1ubuntu1 04/01/2014 >> task: ffff88001eb1dd40 ti: ffff88001bd98000 task.ti: ffff88001bd98000 >> RIP: 0010:[<ffffffff85940bb9>] [<ffffffff85940bb9>] >> tipc_nl_publ_dump+0xa39/0xdf0 >> RSP: 0018:ffff88001bd9f428 EFLAGS: 00010246 >> RAX: dffffc0000000000 RBX: ffff88003562efc0 RCX: ffffc900012c7000 >> RDX: 0000000000000000 RSI: ffff880036215d98 RDI: ffff8800196fda98 >> RBP: ffff88001bd9f678 R08: 0000000000000001 R09: 0000000000000000 >> R10: ffffed00032dfb5a R11: 1ffffffff1131255 R12: 0000000000000000 >> R13: ffff88002d0f8040 R14: 0000000000000000 R15: ffff88002ea220a8 >> FS: 00007f0b7c70f700(0000) GS:ffff880036200000(0000) knlGS:0000000000000000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 0000000020b5d7f2 CR3: 00000000301fe000 CR4: 00000000000006e0 >> Stack: >> 0000000000000000 ffff88002ea22100 ffff88002ea220f8 ffff88002ea220f0 >> 000000001bd9f520 1ffff100037b3e92 ffff88002ea220b0 ffff88001bd9f498 >> ffffffff815bcc6e ffff880036223e40 ffff88002fd60008 0000000000000000 >> Call Trace: >> [<ffffffff84b9d298>] genl_lock_dumpit+0x68/0x90 >> net/netlink/genetlink.c:517 >> [<ffffffff84b9250a>] netlink_dump+0x36a/0xa40 >> net/netlink/af_netlink.c:2108 >> [<ffffffff84b95349>] __netlink_dump_start+0x4e9/0x760 >> net/netlink/af_netlink.c:2196 >> [<ffffffff84b9e5f1>] genl_family_rcv_msg+0xa91/0xc30 >> net/netlink/genetlink.c:584 >> [<ffffffff84b9e93b>] genl_rcv_msg+0x1ab/0x260 net/netlink/genetlink.c:658 >> [<ffffffff84b9ca3c>] netlink_rcv_skb+0x29c/0x390 >> net/netlink/af_netlink.c:2277 >> [<ffffffff84b9db48>] genl_rcv+0x28/0x40 net/netlink/genetlink.c:669 >> [< inline >] netlink_unicast_kernel net/netlink/af_netlink.c:1214 >> [<ffffffff84b9b352>] netlink_unicast+0x5a2/0x890 >> net/netlink/af_netlink.c:1240 >> [<ffffffff84b9bfc1>] netlink_sendmsg+0x981/0xcb0 >> net/netlink/af_netlink.c:1786 >> [< inline >] sock_sendmsg_nosec net/socket.c:612 >> [<ffffffff849ee09a>] sock_sendmsg+0xca/0x110 net/socket.c:622 >> [<ffffffff849efee8>] ___sys_sendmsg+0x728/0x860 net/socket.c:1946 >> [<ffffffff849f1ed1>] __sys_sendmsg+0xd1/0x170 net/socket.c:1980 >> [< inline >] SYSC_sendmsg net/socket.c:1991 >> [<ffffffff849f1f9d>] SyS_sendmsg+0x2d/0x50 net/socket.c:1987 >> [<ffffffff85b4b340>] entry_SYSCALL_64_fastpath+0x23/0xc1 >> arch/x86/entry/entry_64.S:207 >> Code: df 49 8d 7e 10 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 df 01 00 00 >> 4d 8b 76 10 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <0f> b6 >> 14 02 4c 89 f0 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 >> RIP [<ffffffff85940bb9>] tipc_nl_publ_dump+0xa39/0xdf0 >> net/tipc/socket.c:2810 >> RSP <ffff88001bd9f428> >> ---[ end trace e8355fded2057a4f ]--- > Probable fix : > > diff --git a/net/tipc/socket.c b/net/tipc/socket.c > index 3eeb50a27b89..5f80d3fa9c85 100644 > --- a/net/tipc/socket.c > +++ b/net/tipc/socket.c > @@ -2807,6 +2807,9 @@ int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb) > if (err) > return err; > > + if (!attrs[TIPC_NLA_SOCK]) > + return -EINVAL; > + > err = nla_parse_nested(sock, TIPC_NLA_SOCK_MAX, > attrs[TIPC_NLA_SOCK], > tipc_nl_sock_policy); > Yes. I tested with the patch. It works. Thanks.
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