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86581852d7
Unrolling mcast state at msk dismantel time is bug prone, as
syzkaller reported:
======================================================
WARNING: possible circular locking dependency detected
5.11.0-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor905/8822 is trying to acquire lock:
ffffffff8d678fe8 (rtnl_mutex){+.+.}-{3:3}, at: ipv6_sock_mc_close+0xd7/0x110 net/ipv6/mcast.c:323
but task is already holding lock:
ffff888024390120 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1600 [inline]
ffff888024390120 (sk_lock-AF_INET6){+.+.}-{0:0}, at: mptcp6_release+0x57/0x130 net/mptcp/protocol.c:3507
which lock already depends on the new lock.
Instead we can simply forbit any mcast-related setsockopt
Fixes:
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.. | ||
crypto.c | ||
crypto_test.c | ||
ctrl.c | ||
diag.c | ||
Kconfig | ||
Makefile | ||
mib.c | ||
mib.h | ||
mptcp_diag.c | ||
options.c | ||
pm.c | ||
pm_netlink.c | ||
protocol.c | ||
protocol.h | ||
subflow.c | ||
syncookies.c | ||
token.c | ||
token_test.c |