================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:199 [inline] BUG: KASAN: use-after-free in __lt_find include/linux/rbtree_latch.h:118 [inline] BUG: KASAN: use-after-free in latch_tree_find include/linux/rbtree_latch.h:208 [inline] BUG: KASAN: use-after-free in bpf_prog_kallsyms_find kernel/bpf/core.c:674 [inline] BUG: KASAN: use-after-free in bpf_prog_kallsyms_find+0x2a9/0x2c0 kernel/bpf/core.c:667 Read of size 8 at addr ffff8880a78ed108 by task syz-executor825/14679 CPU: 0 PID: 14679 Comm: syz-executor825 Not tainted 5.4.0-rc1+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:634 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 __read_once_size include/linux/compiler.h:199 [inline] __lt_find include/linux/rbtree_latch.h:118 [inline] latch_tree_find include/linux/rbtree_latch.h:208 [inline] bpf_prog_kallsyms_find kernel/bpf/core.c:674 [inline] bpf_prog_kallsyms_find+0x2a9/0x2c0 kernel/bpf/core.c:667 is_bpf_text_address+0x78/0x170 kernel/bpf/core.c:709 kernel_text_address+0x73/0xf0 kernel/extable.c:147 __kernel_text_address+0xd/0x40 kernel/extable.c:102 unwind_get_return_address arch/x86/kernel/unwind_frame.c:19 [inline] unwind_get_return_address+0x61/0xa0 arch/x86/kernel/unwind_frame.c:14 arch_stack_walk+0x97/0xf0 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0xac/0xe0 kernel/stacktrace.c:123 save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:510 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:483 kasan_krealloc+0x84/0xc0 mm/kasan/common.c:565 __do_krealloc mm/slab_common.c:1634 [inline] krealloc+0xa6/0xd0 mm/slab_common.c:1689 push_jmp_history.isra.0+0x83/0x260 kernel/bpf/verifier.c:1411 is_state_visited kernel/bpf/verifier.c:7361 [inline] do_check+0x23bb/0x8a30 kernel/bpf/verifier.c:7517 bpf_check+0x6fff/0x99c0 kernel/bpf/verifier.c:9303 bpf_prog_load+0xe68/0x1660 kernel/bpf/syscall.c:1709 __do_sys_bpf+0xa44/0x3350 kernel/bpf/syscall.c:2866 __se_sys_bpf kernel/bpf/syscall.c:2825 [inline] __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:2825 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441449 Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 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 0f 83 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fffb4b308c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441449 RDX: 0000000000000032 RSI: 0000000020000440 RDI: 0000000000000005 RBP: 000000000007a041 R08: 0000000000000004 R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004021c0 R13: 0000000000402250 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 14677: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:510 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:483 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524 kmem_cache_alloc_trace+0x158/0x790 mm/slab.c:3550 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:686 [inline] bpf_prog_alloc_no_stats+0xe6/0x2b0 kernel/bpf/core.c:88 jit_subprogs kernel/bpf/verifier.c:8716 [inline] fixup_call_args kernel/bpf/verifier.c:8845 [inline] bpf_check+0x6b3d/0x99c0 kernel/bpf/verifier.c:9349 bpf_prog_load+0xe68/0x1660 kernel/bpf/syscall.c:1709 __do_sys_bpf+0xa44/0x3350 kernel/bpf/syscall.c:2866 __se_sys_bpf kernel/bpf/syscall.c:2825 [inline] __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:2825 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 11414: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:471 kasan_slab_free+0xe/0x10 mm/kasan/common.c:480 __cache_free mm/slab.c:3425 [inline] kfree+0x10a/0x2c0 mm/slab.c:3756 __bpf_prog_free+0x87/0xc0 kernel/bpf/core.c:258 bpf_jit_free+0x64/0x1b0 bpf_prog_free_deferred+0x1a6/0x350 kernel/bpf/core.c:1980 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff8880a78ed0c0 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 72 bytes inside of 512-byte region [ffff8880a78ed0c0, ffff8880a78ed2c0) The buggy address belongs to the page: page:ffffea00029e3b40 refcount:1 mapcount:0 mapping:ffff8880aa400a80 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea00029e4208 ffffea00029cf3c8 ffff8880aa400a80 raw: 0000000000000000 ffff8880a78ed0c0 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a78ed000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a78ed080: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb >ffff8880a78ed100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a78ed180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a78ed200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================