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| author | Ying Xue <ying.xue@windriver.com> | 2019-01-14 17:22:24 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-01-15 20:29:20 -0800 |
| commit | a88289f4ddee4165d5f796bd99e09eec3133c16b (patch) | |
| tree | 509473bb1f9496c9be9c0d57974a64873f8ec39c | |
| parent | d62f38c295e56147e8298af1e0e0ec9e7cc14937 (diff) | |
| download | linux-a88289f4ddee4165d5f796bd99e09eec3133c16b.tar.bz2 | |
tipc: fix uninit-value in in tipc_conn_rcv_sub
syzbot reported:
BUG: KMSAN: uninit-value in tipc_conn_rcv_sub+0x184/0x950 net/tipc/topsrv.c:373
CPU: 0 PID: 66 Comm: kworker/u4:4 Not tainted 4.17.0-rc3+ #88
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: tipc_rcv tipc_conn_recv_work
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x185/0x1d0 lib/dump_stack.c:113
kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
__msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683
tipc_conn_rcv_sub+0x184/0x950 net/tipc/topsrv.c:373
tipc_conn_rcv_from_sock net/tipc/topsrv.c:409 [inline]
tipc_conn_recv_work+0x3cd/0x560 net/tipc/topsrv.c:424
process_one_work+0x12c6/0x1f60 kernel/workqueue.c:2145
worker_thread+0x113c/0x24f0 kernel/workqueue.c:2279
kthread+0x539/0x720 kernel/kthread.c:239
ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:412
Local variable description: ----s.i@tipc_conn_recv_work
Variable was created at:
tipc_conn_recv_work+0x65/0x560 net/tipc/topsrv.c:419
process_one_work+0x12c6/0x1f60 kernel/workqueue.c:2145
In tipc_conn_rcv_from_sock(), it always supposes the length of message
received from sock_recvmsg() is not smaller than the size of struct
tipc_subscr. However, this assumption is false. Especially when the
length of received message is shorter than struct tipc_subscr size,
we will end up touching uninitialized fields in tipc_conn_rcv_sub().
Reported-by: syzbot+8951a3065ee7fd6d6e23@syzkaller.appspotmail.com
Reported-by: syzbot+75e6e042c5bbf691fc82@syzkaller.appspotmail.com
Signed-off-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/tipc/topsrv.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/tipc/topsrv.c b/net/tipc/topsrv.c index efb16f69bd2c..a457c0fbbef1 100644 --- a/net/tipc/topsrv.c +++ b/net/tipc/topsrv.c @@ -398,7 +398,7 @@ static int tipc_conn_rcv_from_sock(struct tipc_conn *con) ret = sock_recvmsg(con->sock, &msg, MSG_DONTWAIT); if (ret == -EWOULDBLOCK) return -EWOULDBLOCK; - if (ret > 0) { + if (ret == sizeof(s)) { read_lock_bh(&sk->sk_callback_lock); ret = tipc_conn_rcv_sub(srv, con, &s); read_unlock_bh(&sk->sk_callback_lock); |