================================================================================ UBSAN: array-index-out-of-bounds in kernel/bpf/helpers.c:736:13 index -3 is out of range for type 'char[3][512]' CPU: 1 PID: 339 Comm: syz-executor319 Not tainted 5.15.148-syzkaller-00718-g993bed180178 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 dump_stack+0x15/0x17 lib/dump_stack.c:113 ubsan_epilogue lib/ubsan.c:151 [inline] __ubsan_handle_out_of_bounds+0x118/0x140 lib/ubsan.c:282 try_get_fmt_tmp_buf kernel/bpf/helpers.c:736 [inline] bpf_bprintf_prepare+0x132e/0x1360 kernel/bpf/helpers.c:778 ____bpf_snprintf kernel/bpf/helpers.c:998 [inline] bpf_snprintf+0x155/0x210 kernel/bpf/helpers.c:984 bpf_prog_24bf2b0b20d1d123+0x4c/0x7ac bpf_dispatcher_nop_func include/linux/bpf.h:785 [inline] __bpf_prog_run include/linux/filter.h:625 [inline] bpf_prog_run include/linux/filter.h:632 [inline] bpf_test_run+0x478/0xa10 net/bpf/test_run.c:119 bpf_prog_test_run_skb+0xb41/0x1420 net/bpf/test_run.c:663 bpf_prog_test_run+0x3b0/0x630 kernel/bpf/syscall.c:3342 __sys_bpf+0x525/0x760 kernel/bpf/syscall.c:4645 __do_sys_bpf kernel/bpf/syscall.c:4731 [inline] __se_sys_bpf kernel/bpf/syscall.c:4729 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:4729 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f807c5c9229 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffce24ccac8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f807c5c9229 RDX: 0000000000000050 RSI: 0000000020000640 RDI: 000000000000000a RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000000000a0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ================================================================================