==================================================================
BUG: KASAN: slab-use-after-free in rose_get_neigh+0x549/0x640 net/rose/rose_route.c:692
Read of size 1 at addr ffff8880562ef030 by task syz.5.1791/14894
CPU: 1 UID: 0 PID: 14894 Comm: syz.5.1791 Not tainted 6.16.0-rc3-syzkaller-00057-g92ca6c498a5e #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xcd/0x680 mm/kasan/report.c:521
kasan_report+0xe0/0x110 mm/kasan/report.c:634
rose_get_neigh+0x549/0x640 net/rose/rose_route.c:692
rose_connect+0x2d4/0x1540 net/rose/af_rose.c:816
__sys_connect_file+0x141/0x1a0 net/socket.c:2038
__sys_connect+0x13b/0x160 net/socket.c:2057
__do_sys_connect net/socket.c:2063 [inline]
__se_sys_connect net/socket.c:2060 [inline]
__x64_sys_connect+0x72/0xb0 net/socket.c:2060
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f312218e929
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3123088038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007f31223b6080 RCX: 00007f312218e929
RDX: 000000000000001c RSI: 0000200000000040 RDI: 0000000000000009
RBP: 00007f3122210b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f31223b6080 R15: 00007ffe7d839ef8
Allocated by task 6138:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
kernfs_fop_open+0x244/0xda0 fs/kernfs/file.c:623
do_dentry_open+0x744/0x1c10 fs/open.c:964
vfs_open+0x82/0x3f0 fs/open.c:1094
do_open fs/namei.c:3896 [inline]
path_openat+0x1de4/0x2cb0 fs/namei.c:4055
do_filp_open+0x20b/0x470 fs/namei.c:4082
do_sys_openat2+0x11b/0x1d0 fs/open.c:1437
do_sys_open fs/open.c:1452 [inline]
__do_sys_openat fs/open.c:1468 [inline]
__se_sys_openat fs/open.c:1463 [inline]
__x64_sys_openat+0x174/0x210 fs/open.c:1463
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 6138:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2381 [inline]
slab_free mm/slub.c:4643 [inline]
kfree+0x2b4/0x4d0 mm/slub.c:4842
kernfs_fop_release+0x12c/0x1e0 fs/kernfs/file.c:768
__fput+0x402/0xb70 fs/file_table.c:465
fput_close_sync+0x118/0x260 fs/file_table.c:570
__do_sys_close fs/open.c:1589 [inline]
__se_sys_close fs/open.c:1574 [inline]
__x64_sys_close+0x8b/0x120 fs/open.c:1574
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff8880562ef000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 48 bytes inside of
freed 512-byte region [ffff8880562ef000, ffff8880562ef200)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880562ef000 pfn:0x562ec
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000240 ffff88801b841c80 ffffea0000c2c910 ffffea0000c49510
raw: ffff8880562ef000 000000000010000e 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88801b841c80 ffffea0000c2c910 ffffea0000c49510
head: ffff8880562ef000 000000000010000e 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea000158bb01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5840, tgid 5840 (syz-executor), ts 115557433177, free_ts 36331847661
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704
prep_new_page mm/page_alloc.c:1712 [inline]
get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669
__alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2419
alloc_slab_page mm/slub.c:2451 [inline]
allocate_slab mm/slub.c:2619 [inline]
new_slab+0x23b/0x330 mm/slub.c:2673
___slab_alloc+0xd9c/0x1940 mm/slub.c:3859
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3949
__slab_alloc_node mm/slub.c:4024 [inline]
slab_alloc_node mm/slub.c:4185 [inline]
__do_kmalloc_node mm/slub.c:4327 [inline]
__kmalloc_noprof+0x2f2/0x510 mm/slub.c:4340
kmalloc_noprof include/linux/slab.h:909 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
fib6_info_alloc+0x40/0x160 net/ipv6/ip6_fib.c:155
ip6_route_info_create+0x14c/0x870 net/ipv6/route.c:3811
ip6_route_add.part.0+0x22/0x1d0 net/ipv6/route.c:3940
ip6_route_add+0x45/0x60 net/ipv6/route.c:3937
addrconf_prefix_route+0x2fd/0x510 net/ipv6/addrconf.c:2487
addrconf_add_linklocal+0x329/0x500 net/ipv6/addrconf.c:3312
addrconf_addr_gen+0x36d/0x3c0 net/ipv6/addrconf.c:3441
addrconf_dev_config net/ipv6/addrconf.c:3487 [inline]
addrconf_init_auto_addrs+0x4b9/0x8f0 net/ipv6/addrconf.c:3571
page last free pid 1 tgid 1 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1248 [inline]
__free_frozen_pages+0x7fe/0x1180 mm/page_alloc.c:2706
__free_pages mm/page_alloc.c:5071 [inline]
free_contig_range+0x183/0x4b0 mm/page_alloc.c:6927
destroy_args+0x7f6/0xa60 mm/debug_vm_pgtable.c:1009
debug_vm_pgtable+0x13b8/0x2d00 mm/debug_vm_pgtable.c:1389
do_one_initcall+0x123/0x6e0 init/main.c:1274
do_initcall_level init/main.c:1336 [inline]
do_initcalls init/main.c:1352 [inline]
do_basic_setup init/main.c:1371 [inline]
kernel_init_freeable+0x5c2/0x900 init/main.c:1584
kernel_init+0x1c/0x2b0 init/main.c:1474
ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Memory state around the buggy address:
ffff8880562eef00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880562eef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880562ef000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880562ef080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880562ef100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in rose_new_lci+0x130/0x140 net/rose/af_rose.c:325
Read of size 1 at addr ffff8880562ef031 by task syz.5.1791/14894
CPU: 0 UID: 0 PID: 14894 Comm: syz.5.1791 Tainted: G B 6.16.0-rc3-syzkaller-00057-g92ca6c498a5e #0 PREEMPT(full)
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xcd/0x680 mm/kasan/report.c:521
kasan_report+0xe0/0x110 mm/kasan/report.c:634
rose_new_lci+0x130/0x140 net/rose/af_rose.c:325
rose_connect+0x317/0x1540 net/rose/af_rose.c:823
__sys_connect_file+0x141/0x1a0 net/socket.c:2038
__sys_connect+0x13b/0x160 net/socket.c:2057
__do_sys_connect net/socket.c:2063 [inline]
__se_sys_connect net/socket.c:2060 [inline]
__x64_sys_connect+0x72/0xb0 net/socket.c:2060
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f312218e929
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3123088038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007f31223b6080 RCX: 00007f312218e929
RDX: 000000000000001c RSI: 0000200000000040 RDI: 0000000000000009
RBP: 00007f3122210b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f31223b6080 R15: 00007ffe7d839ef8
Allocated by task 6138:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
kernfs_fop_open+0x244/0xda0 fs/kernfs/file.c:623
do_dentry_open+0x744/0x1c10 fs/open.c:964
vfs_open+0x82/0x3f0 fs/open.c:1094
do_open fs/namei.c:3896 [inline]
path_openat+0x1de4/0x2cb0 fs/namei.c:4055
do_filp_open+0x20b/0x470 fs/namei.c:4082
do_sys_openat2+0x11b/0x1d0 fs/open.c:1437
do_sys_open fs/open.c:1452 [inline]
__do_sys_openat fs/open.c:1468 [inline]
__se_sys_openat fs/open.c:1463 [inline]
__x64_sys_openat+0x174/0x210 fs/open.c:1463
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 6138:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2381 [inline]
slab_free mm/slub.c:4643 [inline]
kfree+0x2b4/0x4d0 mm/slub.c:4842
kernfs_fop_release+0x12c/0x1e0 fs/kernfs/file.c:768
__fput+0x402/0xb70 fs/file_table.c:465
fput_close_sync+0x118/0x260 fs/file_table.c:570
__do_sys_close fs/open.c:1589 [inline]
__se_sys_close fs/open.c:1574 [inline]
__x64_sys_close+0x8b/0x120 fs/open.c:1574
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff8880562ef000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 49 bytes inside of
freed 512-byte region [ffff8880562ef000, ffff8880562ef200)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880562ef000 pfn:0x562ec
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000240 ffff88801b841c80 ffffea0000c2c910 ffffea0000c49510
raw: ffff8880562ef000 000000000010000e 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88801b841c80 ffffea0000c2c910 ffffea0000c49510
head: ffff8880562ef000 000000000010000e 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea000158bb01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5840, tgid 5840 (syz-executor), ts 115557433177, free_ts 36331847661
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704
prep_new_page mm/page_alloc.c:1712 [inline]
get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669
__alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2419
alloc_slab_page mm/slub.c:2451 [inline]
allocate_slab mm/slub.c:2619 [inline]
new_slab+0x23b/0x330 mm/slub.c:2673
___slab_alloc+0xd9c/0x1940 mm/slub.c:3859
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3949
__slab_alloc_node mm/slub.c:4024 [inline]
slab_alloc_node mm/slub.c:4185 [inline]
__do_kmalloc_node mm/slub.c:4327 [inline]
__kmalloc_noprof+0x2f2/0x510 mm/slub.c:4340
kmalloc_noprof include/linux/slab.h:909 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
fib6_info_alloc+0x40/0x160 net/ipv6/ip6_fib.c:155
ip6_route_info_create+0x14c/0x870 net/ipv6/route.c:3811
ip6_route_add.part.0+0x22/0x1d0 net/ipv6/route.c:3940
ip6_route_add+0x45/0x60 net/ipv6/route.c:3937
addrconf_prefix_route+0x2fd/0x510 net/ipv6/addrconf.c:2487
addrconf_add_linklocal+0x329/0x500 net/ipv6/addrconf.c:3312
addrconf_addr_gen+0x36d/0x3c0 net/ipv6/addrconf.c:3441
addrconf_dev_config net/ipv6/addrconf.c:3487 [inline]
addrconf_init_auto_addrs+0x4b9/0x8f0 net/ipv6/addrconf.c:3571
page last free pid 1 tgid 1 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1248 [inline]
__free_frozen_pages+0x7fe/0x1180 mm/page_alloc.c:2706
__free_pages mm/page_alloc.c:5071 [inline]
free_contig_range+0x183/0x4b0 mm/page_alloc.c:6927
destroy_args+0x7f6/0xa60 mm/debug_vm_pgtable.c:1009
debug_vm_pgtable+0x13b8/0x2d00 mm/debug_vm_pgtable.c:1389
do_one_initcall+0x123/0x6e0 init/main.c:1274
do_initcall_level init/main.c:1336 [inline]
do_initcalls init/main.c:1352 [inline]
do_basic_setup init/main.c:1371 [inline]
kernel_init_freeable+0x5c2/0x900 init/main.c:1584
kernel_init+0x1c/0x2b0 init/main.c:1474
ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Memory state around the buggy address:
ffff8880562eef00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880562eef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880562ef000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880562ef080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880562ef100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================