linux-kernel - Re: [syzbot] [net?] possible deadlock in do_ip

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Message-ID: <aa2b8eb7-a60c-43cf-ae70-9569dd7b9e85@gmail.com>
Date: Tue, 17 Sep 2024 17:58:57 -0400
From: Ananta Srikar Puranam <srikarananta01@...il.com>
To: syzbot+e4c27043b9315839452d@...kaller.appspotmail.com
Cc: alibuda@...ux.alibaba.com, davem@...emloft.net, dsahern@...nel.org,
 dust.li@...ux.alibaba.com, edumazet@...gle.com, kuba@...nel.org,
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com,
 schnelle@...ux.ibm.com, srikarananta01@...il.com,
 syzkaller-bugs@...glegroups.com, wenjia@...ux.ibm.com
Subject: Re: [syzbot] [net?] possible deadlock in do_ip_setsockopt (4)

#syz test 
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
2f27fce67173bbb05d5a0ee03dae5c021202c912

Fixed the circular lock dependency reported by syzkaller.

Signed-off-by: Ananta Srikar <srikarananta01@...il.com>
Reported-by: syzbot+e4c27043b9315839452d@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=e4c27043b9315839452d
Fixes: d2bafcf224f3 ("Merge tag 'cgroup-for-6.11-rc4-fixes' of 
git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup")
---
  net/ipv4/ip_sockglue.c | 4 +++-
  1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index cf377377b52d..a8f46d1ba62b 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -1073,9 +1073,11 @@ int do_ip_setsockopt(struct sock *sk, int level, 
int optname,
      }

      err = 0;
+
+    sockopt_lock_sock(sk);
+
      if (needs_rtnl)
          rtnl_lock();
-    sockopt_lock_sock(sk);

      switch (optname) {
      case IP_OPTIONS:
-- 
2.43.0