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Message-ID: <1578106116-22543-1-git-send-email-ying.xue@windriver.com>
Date: Sat, 4 Jan 2020 10:48:36 +0800
From: Ying Xue <ying.xue@...driver.com>
To: <netdev@...r.kernel.org>, <davem@...emloft.net>
CC: <maloy@...jonn.com>, <tipc-discussion@...ts.sourceforge.net>
Subject: [PATCH net] tipc: eliminate KMSAN: uninit-value in __tipc_nl_compat_dumpit error
syzbot found the following crash on:
=====================================================
BUG: KMSAN: uninit-value in __nlmsg_parse include/net/netlink.h:661 [inline]
BUG: KMSAN: uninit-value in nlmsg_parse_deprecated
include/net/netlink.h:706 [inline]
BUG: KMSAN: uninit-value in __tipc_nl_compat_dumpit+0x553/0x11e0
net/tipc/netlink_compat.c:215
CPU: 0 PID: 12425 Comm: syz-executor062 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1c9/0x220 lib/dump_stack.c:118
kmsan_report+0x128/0x220 mm/kmsan/kmsan_report.c:108
__msan_warning+0x57/0xa0 mm/kmsan/kmsan_instr.c:245
__nlmsg_parse include/net/netlink.h:661 [inline]
nlmsg_parse_deprecated include/net/netlink.h:706 [inline]
__tipc_nl_compat_dumpit+0x553/0x11e0 net/tipc/netlink_compat.c:215
tipc_nl_compat_dumpit+0x761/0x910 net/tipc/netlink_compat.c:308
tipc_nl_compat_handle net/tipc/netlink_compat.c:1252 [inline]
tipc_nl_compat_recv+0x12e9/0x2870 net/tipc/netlink_compat.c:1311
genl_family_rcv_msg_doit net/netlink/genetlink.c:672 [inline]
genl_family_rcv_msg net/netlink/genetlink.c:717 [inline]
genl_rcv_msg+0x1dd0/0x23a0 net/netlink/genetlink.c:734
netlink_rcv_skb+0x431/0x620 net/netlink/af_netlink.c:2477
genl_rcv+0x63/0x80 net/netlink/genetlink.c:745
netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
netlink_unicast+0xfa0/0x1100 net/netlink/af_netlink.c:1328
netlink_sendmsg+0x11f0/0x1480 net/netlink/af_netlink.c:1917
sock_sendmsg_nosec net/socket.c:639 [inline]
sock_sendmsg net/socket.c:659 [inline]
____sys_sendmsg+0x1362/0x13f0 net/socket.c:2330
___sys_sendmsg net/socket.c:2384 [inline]
__sys_sendmsg+0x4f0/0x5e0 net/socket.c:2417
__do_sys_sendmsg net/socket.c:2426 [inline]
__se_sys_sendmsg+0x97/0xb0 net/socket.c:2424
__x64_sys_sendmsg+0x4a/0x70 net/socket.c:2424
do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:295
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x444179
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 1b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd2d6409c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000444179
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 00000000006ce018 R08: 0000000000000000 R09: 00000000004002e0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401e20
R13: 0000000000401eb0 R14: 0000000000000000 R15: 0000000000000000
Uninit was created at:
kmsan_save_stack_with_flags mm/kmsan/kmsan.c:149 [inline]
kmsan_internal_poison_shadow+0x5c/0x110 mm/kmsan/kmsan.c:132
kmsan_slab_alloc+0x8a/0xe0 mm/kmsan/kmsan_hooks.c:86
slab_alloc_node mm/slub.c:2774 [inline]
__kmalloc_node_track_caller+0xe47/0x11f0 mm/slub.c:4382
__kmalloc_reserve net/core/skbuff.c:141 [inline]
__alloc_skb+0x309/0xa50 net/core/skbuff.c:209
alloc_skb include/linux/skbuff.h:1049 [inline]
nlmsg_new include/net/netlink.h:888 [inline]
tipc_nl_compat_dumpit+0x6e4/0x910 net/tipc/netlink_compat.c:301
tipc_nl_compat_handle net/tipc/netlink_compat.c:1252 [inline]
tipc_nl_compat_recv+0x12e9/0x2870 net/tipc/netlink_compat.c:1311
genl_family_rcv_msg_doit net/netlink/genetlink.c:672 [inline]
genl_family_rcv_msg net/netlink/genetlink.c:717 [inline]
genl_rcv_msg+0x1dd0/0x23a0 net/netlink/genetlink.c:734
netlink_rcv_skb+0x431/0x620 net/netlink/af_netlink.c:2477
genl_rcv+0x63/0x80 net/netlink/genetlink.c:745
netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
netlink_unicast+0xfa0/0x1100 net/netlink/af_netlink.c:1328
netlink_sendmsg+0x11f0/0x1480 net/netlink/af_netlink.c:1917
sock_sendmsg_nosec net/socket.c:639 [inline]
sock_sendmsg net/socket.c:659 [inline]
____sys_sendmsg+0x1362/0x13f0 net/socket.c:2330
___sys_sendmsg net/socket.c:2384 [inline]
__sys_sendmsg+0x4f0/0x5e0 net/socket.c:2417
__do_sys_sendmsg net/socket.c:2426 [inline]
__se_sys_sendmsg+0x97/0xb0 net/socket.c:2424
__x64_sys_sendmsg+0x4a/0x70 net/socket.c:2424
do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:295
entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
The complaint above occurred because the memory region pointed by attrbuf
variable was not initialized. To eliminate this warning, we use kcalloc()
rather than kmalloc_array() to allocate memory for attrbuf.
Reported-by: syzbot+b1fd2bf2c89d8407e15f@...kaller.appspotmail.com
Signed-off-by: Ying Xue <ying.xue@...driver.com>
---
net/tipc/netlink_compat.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/tipc/netlink_compat.c b/net/tipc/netlink_compat.c
index 0254bb7..2175163 100644
--- a/net/tipc/netlink_compat.c
+++ b/net/tipc/netlink_compat.c
@@ -204,8 +204,8 @@ static int __tipc_nl_compat_dumpit(struct tipc_nl_compat_cmd_dump *cmd,
return -ENOMEM;
}
- attrbuf = kmalloc_array(tipc_genl_family.maxattr + 1,
- sizeof(struct nlattr *), GFP_KERNEL);
+ attrbuf = kcalloc(tipc_genl_family.maxattr + 1,
+ sizeof(struct nlattr *), GFP_KERNEL);
if (!attrbuf) {
err = -ENOMEM;
goto err_out;
--
2.7.4
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