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BUG: KASAN: slab-out-of-bounds in bpf_prog_create+0xda/0x1f0 net/core/filter.c:1351
Read of size 128 at addr ffff8880a3530e40 by task syz-executor.1/3643

CPU: 0 PID: 3643 Comm: syz-executor.1 Not tainted 5.4.0-syzkaller #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+0x1fb/0x318 lib/dump_stack.c:118
 print_address_description+0x75/0x5c0 mm/kasan/report.c:374
 __kasan_report+0x14b/0x1c0 mm/kasan/report.c:506
 kasan_report+0x26/0x50 mm/kasan/common.c:634
 check_memory_region_inline mm/kasan/generic.c:182 [inline]
 check_memory_region+0x2cf/0x2e0 mm/kasan/generic.c:192
 memcpy+0x28/0x60 mm/kasan/common.c:122
 bpf_prog_create+0xda/0x1f0 net/core/filter.c:1351
 get_filter drivers/net/ppp/ppp_generic.c:572 [inline]
 ppp_get_filter drivers/net/ppp/ppp_generic.c:584 [inline]
 ppp_ioctl+0x1870/0x1ff0 drivers/net/ppp/ppp_generic.c:801
 do_vfs_ioctl+0x744/0x1730 fs/ioctl.c:47
 ksys_ioctl fs/ioctl.c:743 [inline]
 __do_sys_ioctl fs/ioctl.c:750 [inline]
 __se_sys_ioctl fs/ioctl.c:748 [inline]
 __x64_sys_ioctl+0xe3/0x120 fs/ioctl.c:748
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a679
Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f1d5e6fac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a679
RDX: 0000000020000140 RSI: 0000000040107446 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1d5e6fb6d4
R13: 00000000004c45dc R14: 00000000004d9b30 R15: 00000000ffffffff

Allocated by task 3643:
 save_stack mm/kasan/common.c:69 [inline]
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc+0x11c/0x1b0 mm/kasan/common.c:510
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524
 __do_kmalloc mm/slab.c:3655 [inline]
 __kmalloc_track_caller+0x253/0x340 mm/slab.c:3670
 memdup_user+0x25/0xa0 mm/util.c:172
 get_filter drivers/net/ppp/ppp_generic.c:568 [inline]
 ppp_get_filter drivers/net/ppp/ppp_generic.c:584 [inline]
 ppp_ioctl+0x1411/0x1ff0 drivers/net/ppp/ppp_generic.c:801
 do_vfs_ioctl+0x744/0x1730 fs/ioctl.c:47
 ksys_ioctl fs/ioctl.c:743 [inline]
 __do_sys_ioctl fs/ioctl.c:750 [inline]
 __se_sys_ioctl fs/ioctl.c:748 [inline]
 __x64_sys_ioctl+0xe3/0x120 fs/ioctl.c:748
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 9530:
 save_stack mm/kasan/common.c:69 [inline]
 set_track mm/kasan/common.c:77 [inline]
 kasan_set_free_info mm/kasan/common.c:332 [inline]
 __kasan_slab_free+0x12a/0x1e0 mm/kasan/common.c:471
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:480
 __cache_free mm/slab.c:3425 [inline]
 kfree+0x115/0x200 mm/slab.c:3756
 tomoyo_path_perm+0x6af/0x850 security/tomoyo/file.c:842
 tomoyo_inode_getattr+0x1c/0x20 security/tomoyo/tomoyo.c:129
 security_inode_getattr+0xd5/0x150 security/security.c:1222
 vfs_getattr+0x2a/0x6d0 fs/stat.c:115
 vfs_statx fs/stat.c:191 [inline]
 vfs_lstat include/linux/fs.h:3250 [inline]
 __do_sys_newlstat fs/stat.c:354 [inline]
 __se_sys_newlstat+0x9a/0x150 fs/stat.c:348
 __x64_sys_newlstat+0x5b/0x70 fs/stat.c:348
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880a3530e40
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
 32-byte region [ffff8880a3530e40, ffff8880a3530e60)
The buggy address belongs to the page:
page:ffffea00028d4c00 refcount:1 mapcount:0 mapping:ffff8880aa4001c0 index:0xffff8880a3530fc1
raw: 00fffe0000000200 ffffea00029df448 ffffea00028cb8c8 ffff8880aa4001c0
raw: ffff8880a3530fc1 ffff8880a3530000 000000010000003f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a3530d00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8880a3530d80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8880a3530e00: 00 00 00 fc fc fc fc fc 00 00 fc fc fc fc fc fc
                                                 ^
 ffff8880a3530e80: 00 00 00 fc fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8880a3530f00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
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