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Subject: [syzbot ci] Re: tipc: bound reassembly size in tipc_buf_append() From: syzbot ci To: davem@davemloft.net, edumazet@kernel.org, jmaloy@redhat.com, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, noahweinberger2003@proton.me, pabeni@redhat.com, tung.quang.nguyen@est.tech Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v1] tipc: bound reassembly size in tipc_buf_append() https://lore.kernel.org/all/AoU-V5M5ZCKF37bLl8ILhgeNdsnCEaiaQNuWP4K56kRfJsnhkIexZ8tFRLq7uzGiA0qNqK6shXcSZ5E4hyV0-QI0ZWSuKiJzKvMrv3NfqCg=@proton.me * [PATCH] tipc: bound reassembly size in tipc_buf_append() and found the following issue: general protection fault in tipc_buf_append Full report is available here: https://ci.syzbot.org/series/3856f5b1-55ca-4bc2-885e-034eb8af1bdf *** general protection fault in tipc_buf_append tree: net-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git base: c4c470912125ec8a1a427a70f4085d8a731b00e4 arch: amd64 compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 config: https://ci.syzbot.org/builds/28264169-6c3f-405e-9f6a-339572b43e52/config syz repro: https://ci.syzbot.org/findings/e9e2a2a5-41e6-4866-89fc-45c75bfe992b/syz_repro Oops: general protection fault, probably for non-canonical address 0xdffffc000000000e: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000070-0x0000000000000077] CPU: 1 UID: 0 PID: 5915 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:tipc_buf_append+0x389/0xa20 net/tipc/msg.c:153 Code: e9 b5 01 00 00 e8 97 ea 29 f6 48 8b 44 24 20 42 80 3c 30 00 48 8b 5c 24 28 74 08 48 89 df e8 8e 74 a1 f6 48 c7 03 00 00 00 00 <41> 0f b6 46 0e 84 c0 0f 85 ea 04 00 00 8b 1c 25 70 00 00 00 4d 8d RSP: 0018:ffffc900039defa0 EFLAGS: 00010246 RAX: 1ffff9200073be13 RBX: ffffc900039df098 RCX: ffff88810d335a00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88816af130c0 RBP: ffffc900039df078 R08: ffff8881ba5f6ee3 R09: 1ffff110374beddc R10: dffffc0000000000 R11: ffffed10374beddd R12: 1ffff1102d5e2617 R13: 1ffff9200073bdfc R14: dffffc0000000000 R15: ffff88816af12ff0 FS: 00007fbe193e76c0(0000) GS:ffff8882a7809000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbe193e6ff8 CR3: 0000000117562000 CR4: 00000000000006f0 Call Trace: tipc_msg_reassemble+0x230/0x3b0 net/tipc/msg.c:807 tipc_mcast_xmit+0x254/0x19e0 net/tipc/bcast.c:392 tipc_sendmcast net/tipc/socket.c:887 [inline] __tipc_sendmsg+0x2074/0x2b60 net/tipc/socket.c:1470 tipc_sendmsg+0x55/0x70 net/tipc/socket.c:1404 sock_sendmsg_nosec+0x14e/0x190 net/socket.c:800 __sock_sendmsg net/socket.c:818 [inline] ____sys_sendmsg+0x54e/0x850 net/socket.c:2715 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2769 __sys_sendmmsg+0x273/0x4e0 net/socket.c:2858 __do_sys_sendmmsg net/socket.c:2885 [inline] __se_sys_sendmmsg net/socket.c:2882 [inline] __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2882 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbe185a8f19 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fbe193e7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007fbe18825fa0 RCX: 00007fbe185a8f19 RDX: 0000000000000300 RSI: 0000200000006740 RDI: 0000000000000003 RBP: 00007fbe18637f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbe18826038 R14: 00007fbe18825fa0 R15: 00007ffeceeefb38 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:tipc_buf_append+0x389/0xa20 net/tipc/msg.c:153 Code: e9 b5 01 00 00 e8 97 ea 29 f6 48 8b 44 24 20 42 80 3c 30 00 48 8b 5c 24 28 74 08 48 89 df e8 8e 74 a1 f6 48 c7 03 00 00 00 00 <41> 0f b6 46 0e 84 c0 0f 85 ea 04 00 00 8b 1c 25 70 00 00 00 4d 8d RSP: 0018:ffffc900039defa0 EFLAGS: 00010246 RAX: 1ffff9200073be13 RBX: ffffc900039df098 RCX: ffff88810d335a00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88816af130c0 RBP: ffffc900039df078 R08: ffff8881ba5f6ee3 R09: 1ffff110374beddc R10: dffffc0000000000 R11: ffffed10374beddd R12: 1ffff1102d5e2617 R13: 1ffff9200073bdfc R14: dffffc0000000000 R15: ffff88816af12ff0 FS: 00007fbe193e76c0(0000) GS:ffff8882a7809000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbe193e6ff8 CR3: 0000000117562000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess): 0: e9 b5 01 00 00 jmp 0x1ba 5: e8 97 ea 29 f6 call 0xf629eaa1 a: 48 8b 44 24 20 mov 0x20(%rsp),%rax f: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) 14: 48 8b 5c 24 28 mov 0x28(%rsp),%rbx 19: 74 08 je 0x23 1b: 48 89 df mov %rbx,%rdi 1e: e8 8e 74 a1 f6 call 0xf6a174b1 23: 48 c7 03 00 00 00 00 movq $0x0,(%rbx) * 2a: 41 0f b6 46 0e movzbl 0xe(%r14),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 ea 04 00 00 jne 0x521 37: 8b 1c 25 70 00 00 00 mov 0x70,%ebx 3e: 4d rex.WRB 3f: 8d .byte 0x8d *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com.