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BUG: KASAN: slab-out-of-bounds in do_jit.isra.0+0x4c35/0x5630 arch/x86/net/bpf_jit_comp.c:966
Read of size 4 at addr ffff888096509bfc by task syz-executor.5/4739

CPU: 0 PID: 4739 Comm: syz-executor.5 Not tainted 5.2.0+ #41
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.cold+0xd4/0x306 mm/kasan/report.c:351
 __kasan_report.cold+0x1b/0x36 mm/kasan/report.c:482
 kasan_report+0x12/0x20 mm/kasan/common.c:612
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:131
 do_jit.isra.0+0x4c35/0x5630 arch/x86/net/bpf_jit_comp.c:966
 bpf_int_jit_compile+0x374/0xda0 arch/x86/net/bpf_jit_comp.c:1132
 bpf_prog_select_runtime+0x4cd/0x7d0 kernel/bpf/core.c:1726
 bpf_prog_load+0xe9b/0x1670 kernel/bpf/syscall.c:1702
 __do_sys_bpf+0xa46/0x42f0 kernel/bpf/syscall.c:2849
 __se_sys_bpf kernel/bpf/syscall.c:2808 [inline]
 __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:2808
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459829
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f0735481c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459829
RDX: 0000000000000048 RSI: 0000000020000200 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f07354826d4
R13: 00000000004bfc7c R14: 00000000004d1878 R15: 00000000ffffffff

Allocated by task 2572:
 save_stack+0x23/0x90 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc mm/kasan/common.c:487 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:460
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:501
 __do_kmalloc mm/slab.c:3655 [inline]
 __kmalloc+0x163/0x780 mm/slab.c:3664
 kmalloc include/linux/slab.h:557 [inline]
 kzalloc include/linux/slab.h:748 [inline]
 ext4_htree_store_dirent+0x8a/0x650 fs/ext4/dir.c:452
 htree_dirblock_to_tree+0x4e5/0x8f0 fs/ext4/namei.c:1039
 ext4_htree_fill_tree+0x26c/0xa80 fs/ext4/namei.c:1116
 ext4_dx_readdir fs/ext4/dir.c:576 [inline]
 ext4_readdir+0x1bd3/0x3520 fs/ext4/dir.c:124
 iterate_dir+0x47f/0x5e0 fs/readdir.c:51
 __do_sys_getdents fs/readdir.c:231 [inline]
 __se_sys_getdents fs/readdir.c:212 [inline]
 __x64_sys_getdents+0x1dd/0x370 fs/readdir.c:212
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 2572:
 save_stack+0x23/0x90 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:449
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:457
 __cache_free mm/slab.c:3425 [inline]
 kfree+0x10a/0x2c0 mm/slab.c:3756
 free_rb_tree_fname+0x87/0xe0 fs/ext4/dir.c:404
 ext4_htree_free_dir_info fs/ext4/dir.c:426 [inline]
 ext4_release_dir+0x46/0x70 fs/ext4/dir.c:624
 __fput+0x2ff/0x890 fs/file_table.c:280
 ____fput+0x16/0x20 fs/file_table.c:313
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:185 [inline]
 exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x5a9/0x6a0 arch/x86/entry/common.c:299
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff888096509b80
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 60 bytes to the right of
 64-byte region [ffff888096509b80, ffff888096509bc0)
The buggy address belongs to the page:
page:ffffea0002594240 refcount:1 mapcount:0 mapping:ffff8880aa400380 index:0xffff888096509580
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea000277a048 ffffea0002834508 ffff8880aa400380
raw: ffff888096509580 ffff888096509000 000000010000001a 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888096509a80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
 ffff888096509b00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff888096509b80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                                                                ^
 ffff888096509c00: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
 ffff888096509c80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
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