CVE-2024-40959

In the Linux kernel, the following vulnerability has been resolved:

xfrm6: check ip6dstidev() return value in xfrm6getsaddr()

ip6dstidev() can return NULL, xfrm6getsaddr() must act accordingly.

syzbot reported:

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 12 Comm: kworker/u8:1 Not tainted 6.10.0-rc2-syzkaller-00383-gb8481381d4e2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Workqueue: wg-kex-wg1 wgpackethandshakesendworker RIP: 0010:xfrm6getsaddr+0x93/0x130 net/ipv6/xfrm6policy.c:64 Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 97 00 00 00 4c 8b ab d8 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 86 00 00 00 4d 8b 6d 00 e8 ca 13 47 01 48 b8 00 RSP: 0018:ffffc90000117378 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff88807b079dc0 RCX: ffffffff89a0d6d7 RDX: 0000000000000000 RSI: ffffffff89a0d6e9 RDI: ffff88807b079e98 RBP: ffff88807ad73248 R08: 0000000000000007 R09: fffffffffffff000 R10: ffff88807b079dc0 R11: 0000000000000007 R12: ffffc90000117480 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4586d00440 CR3: 0000000079042000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> xfrmgetsaddr net/xfrm/xfrmpolicy.c:2452 [inline] xfrmtmplresolveone net/xfrm/xfrmpolicy.c:2481 [inline] xfrmtmplresolve+0xa26/0xf10 net/xfrm/xfrmpolicy.c:2541 xfrmresolveandcreatebundle+0x140/0x2570 net/xfrm/xfrmpolicy.c:2835 xfrmbundlelookup net/xfrm/xfrmpolicy.c:3070 [inline] xfrmlookupwithifid+0x4d1/0x1e60 net/xfrm/xfrmpolicy.c:3201 xfrmlookup net/xfrm/xfrmpolicy.c:3298 [inline] xfrmlookuproute+0x3b/0x200 net/xfrm/xfrmpolicy.c:3309 ip6dstlookupflow+0x15c/0x1d0 net/ipv6/ip6output.c:1256 send6+0x611/0xd20 drivers/net/wireguard/socket.c:139 wgsocketsendskbtopeer+0xf9/0x220 drivers/net/wireguard/socket.c:178 wgsocketsendbuffertopeer+0x12b/0x190 drivers/net/wireguard/socket.c:200 wgpacketsendhandshakeinitiation+0x227/0x360 drivers/net/wireguard/send.c:40 wgpackethandshakesendworker+0x1c/0x30 drivers/net/wireguard/send.c:51 processonework+0x9fb/0x1b60 kernel/workqueue.c:3231 processscheduledworks kernel/workqueue.c:3312 [inline] workerthread+0x6c8/0xf70 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 retfromfork+0x45/0x80 arch/x86/kernel/process.c:147 retfromforkasm+0x1a/0x30 arch/x86/entry/entry_64.S:244