From 8be6f88b9d3fe1f6724daec4a70d6023742c9df7 Mon Sep 17 00:00:00 2001
From: Eric Dumazet <edumazet@google.com>
Date: Mon, 28 Aug 2023 08:47:32 +0000
Subject: [PATCH] inet: fix IP_TRANSPARENT error handling
My recent patch forgot to change error handling for IP_TRANSPARENT
socket option.
WARNING: bad unlock balance detected!
6.5.0-rc7-syzkaller-01717-g59da9885767a #0 Not tainted
-------------------------------------
syz-executor151/5028 is trying to release lock (sk_lock-AF_INET) at:
[<ffffffff88213983>] sockopt_release_sock+0x53/0x70 net/core/sock.c:1073
but there are no more locks to release!
other info that might help us debug this:
1 lock held by syz-executor151/5028:
stack backtrace:
CPU: 0 PID: 5028 Comm: syz-executor151 Not tainted 6.5.0-rc7-syzkaller-01717-g59da9885767a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
__lock_release kernel/locking/lockdep.c:5438 [inline]
lock_release+0x4b5/0x680 kernel/locking/lockdep.c:5781
sock_release_ownership include/net/sock.h:1824 [inline]
release_sock+0x175/0x1b0 net/core/sock.c:3527
sockopt_release_sock+0x53/0x70 net/core/sock.c:1073
do_ip_setsockopt+0x12c1/0x3640 net/ipv4/ip_sockglue.c:1364
ip_setsockopt+0x59/0xe0 net/ipv4/ip_sockglue.c:1419
raw_setsockopt+0x218/0x290 net/ipv4/raw.c:833
__sys_setsockopt+0x2cd/0x5b0 net/socket.c:2305
__do_sys_setsockopt net/socket.c:2316 [inline]
__se_sys_setsockopt net/socket.c:2313 [inline]
Fixes: 4bd0623f04ee ("inet: move inet->transparent to inet->inet_flags")
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Soheil Hassas Yeganeh <soheil@google.com>
Cc: Simon Horman <horms@kernel.org>
Cc: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/ipv4/ip_sockglue.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 54ad0f0d5c2dd..d1c73660b8449 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -1007,12 +1007,10 @@ int do_ip_setsockopt(struct sock *sk, int level, int optname,
return 0;
case IP_TRANSPARENT:
if (!!val && !sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
- !sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
- err = -EPERM;
- break;
- }
+ !sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
+ return -EPERM;
if (optlen < 1)
- goto e_inval;
+ return -EINVAL;
inet_assign_bit(TRANSPARENT, sk, val);
return 0;
case IP_NODEFRAG: