DEBIAN-CVE-2022-49018

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix sleep in atomic at close time Matt reported a splat at msk close time: BUG: sleeping function called from invalid context at net/mptcp/protocol.c:2877 inatomic(): 1, irqsdisabled(): 0, nonblock: 0, pid: 155, name: packetdrill preemptcount: 201, expected: 0 RCU nest depth: 0, expected: 0 4 locks held by packetdrill/155: #0: ffff888001536990 (&sb->stype->imutex_key#6){+.+.}-{3:3}, at: __sockrelease (net/socket.c:650) #1: ffff88800b498130 (sklock-AFINET){+.+.}-{0:0}, at: mptcpclose (net/mptcp/protocol.c:2973) #2: ffff88800b49a130 (sklock-AFINET/1){+.+.}-{0:0}, at: __mptcpclosessk (net/mptcp/protocol.c:2363) #3: ffff88800b49a0b0 (slock-AF_INET){+...}-{2:2}, at: __locksockfast (include/net/sock.h:1820) Preemption disabled at: 0x0 CPU: 1 PID: 155 Comm: packetdrill Not tainted 6.1.0-rc5 #365 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Call Trace: <TASK> dump_stacklvl (lib/dumpstack.c:107 (discriminator 4)) __might_resched.cold (kernel/sched/core.c:9891) __mptcpdestroysock (include/linux/kernel.h:110) __mptcpclose (net/mptcp/protocol.c:2959) mptcpsubflowqueueclean (include/net/sock.h:1777) __mptcpclosessk (net/mptcp/protocol.c:2363) mptcpdestroycommon (net/mptcp/protocol.c:3170) mptcp_destroy (include/net/sock.h:1495) __mptcpdestroysock (net/mptcp/protocol.c:2886) __mptcpclose (net/mptcp/protocol.c:2959) mptcpclose (net/mptcp/protocol.c:2974) inetrelease (net/ipv4/afinet.c:432) __sockrelease (net/socket.c:651) sockclose (net/socket.c:1367) __fput (fs/filetable.c:320) taskworkrun (kernel/taskwork.c:181 (discriminator 1)) exittousermodeprepare (include/linux/resumeusermode.h:49) syscallexittousermode (kernel/entry/common.c:130) dosyscall64 (arch/x86/entry/common.c:87) entrySYSCALL64afterhwframe (arch/x86/entry/entry64.S:120) We can't call mptcpclose under the 'fast' socket lock variant, replace it with a socklocknested() as the relevant code is already under the listening msk socket lock protection.