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Message-ID: <0d3ccb61-22e0-4aa1-97f3-ac4f08a4c20b@gmail.com>
Date: Tue, 17 Sep 2024 17:47:00 -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)
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
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