loop7: detected capacity change from 0 to 16 EXT4-fs (loop7): bad geometry: block count 64 exceeds size of device (2 blocks) ================================================================== BUG: KASAN: slab-use-after-free in xfrm_alloc_spi+0xf67/0x1210 Read of size 4 at addr ffff88800a160944 by task syz-executor.4/5832 CPU: 1 UID: 0 PID: 5832 Comm: syz-executor.4 Not tainted 6.16.0-next-20250805 #1 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0xca/0x120 print_report+0xcb/0x610 kasan_report+0xca/0x100 xfrm_alloc_spi+0xf67/0x1210 xfrm_alloc_userspi+0x607/0xbb0 xfrm_user_rcv_msg+0x459/0xa00 netlink_rcv_skb+0x147/0x430 xfrm_netlink_rcv+0x74/0x90 netlink_unicast+0x5a7/0x870 netlink_sendmsg+0x8ac/0xd80 ____sys_sendmsg+0xa67/0xc20 ___sys_sendmsg+0x10f/0x1b0 __sys_sendmsg+0x150/0x200 do_syscall_64+0xbf/0x360 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe82469db19 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe821c13188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fe8247b0f60 RCX: 00007fe82469db19 RDX: 0000000000000000 RSI: 0000000020000400 RDI: 0000000000000003 RBP: 00007fe8246f7f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff9235ff2f R14: 00007fe821c13300 R15: 0000000000022000 Allocated by task 5826: kasan_save_stack+0x24/0x50 kasan_save_track+0x14/0x30 __kasan_slab_alloc+0x59/0x70 kmem_cache_alloc_noprof+0x13c/0x3d0 xfrm_state_alloc+0x25/0x600 xfrm_add_acquire+0x103/0xc30 xfrm_user_rcv_msg+0x459/0xa00 netlink_rcv_skb+0x147/0x430 xfrm_netlink_rcv+0x74/0x90 netlink_unicast+0x5a7/0x870 netlink_sendmsg+0x8ac/0xd80 ____sys_sendmsg+0xa67/0xc20 ___sys_sendmsg+0x10f/0x1b0 __sys_sendmsg+0x150/0x200 do_syscall_64+0xbf/0x360 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5826: kasan_save_stack+0x24/0x50 kasan_save_track+0x14/0x30 kasan_save_free_info+0x3a/0x60 __kasan_slab_free+0x3f/0x50 kmem_cache_free+0x2a1/0x460 xfrm_add_acquire+0x936/0xc30 xfrm_user_rcv_msg+0x459/0xa00 netlink_rcv_skb+0x147/0x430 xfrm_netlink_rcv+0x74/0x90 netlink_unicast+0x5a7/0x870 netlink_sendmsg+0x8ac/0xd80 ____sys_sendmsg+0xa67/0xc20 ___sys_sendmsg+0x10f/0x1b0 __sys_sendmsg+0x150/0x200 do_syscall_64+0xbf/0x360 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88800a160880 which belongs to the cache xfrm_state of size 920 The buggy address is located 196 bytes inside of freed 920-byte region [ffff88800a160880, ffff88800a160c18) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88800a160cc0 pfn:0xa160 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x100000000000040(head|node=0|zone=1) page_type: f5(slab) raw: 0100000000000040 ffff88800a6f5000 dead000000000122 0000000000000000 raw: ffff88800a160cc0 00000000800f000c 00000000f5000000 0000000000000000 head: 0100000000000040 ffff88800a6f5000 dead000000000122 0000000000000000 head: ffff88800a160cc0 00000000800f000c 00000000f5000000 0000000000000000 head: 0100000000000002 ffffea0000285801 00000000ffffffff 00000000ffffffff head: ffff88800a161de0 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88800a160800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88800a160880: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88800a160900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88800a160980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88800a160a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 UID: 0 PID: 5832 Comm: syz-executor.4 Tainted: G B 6.16.0-next-20250805 #1 PREEMPT(voluntary) Tainted: [B]=BAD_PAGE Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:xfrm_alloc_spi+0xb62/0x1210 Code: 89 f2 48 c1 ea 03 80 3c 02 00 0f 85 e9 05 00 00 48 8b 44 24 28 4c 8b 68 30 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 b8 05 00 00 4c 89 e2 49 89 6d 00 48 b8 00 00 00 RSP: 0018:ffff888016087338 EFLAGS: 00010256 RAX: dffffc0000000000 RBX: ffff88800a160880 RCX: ffffffff841ccd86 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88800a1608b0 RBP: ffff88800a161128 R08: 0000000000000001 R09: fffffbfff0f10c90 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800a1608b0 R13: 0000000000000000 R14: ffff88800a161130 R15: 0000000000000000 FS: 00007fe821c13700(0000) GS:ffff8880e56e5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f859f149018 CR3: 000000000d782000 CR4: 0000000000350ef0 Call Trace: xfrm_alloc_userspi+0x607/0xbb0 xfrm_user_rcv_msg+0x459/0xa00 netlink_rcv_skb+0x147/0x430 xfrm_netlink_rcv+0x74/0x90 netlink_unicast+0x5a7/0x870 netlink_sendmsg+0x8ac/0xd80 ____sys_sendmsg+0xa67/0xc20 ___sys_sendmsg+0x10f/0x1b0 __sys_sendmsg+0x150/0x200 do_syscall_64+0xbf/0x360 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe82469db19 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe821c13188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fe8247b0f60 RCX: 00007fe82469db19 RDX: 0000000000000000 RSI: 0000000020000400 RDI: 0000000000000003 RBP: 00007fe8246f7f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff9235ff2f R14: 00007fe821c13300 R15: 0000000000022000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:xfrm_alloc_spi+0xb62/0x1210 Code: 89 f2 48 c1 ea 03 80 3c 02 00 0f 85 e9 05 00 00 48 8b 44 24 28 4c 8b 68 30 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 b8 05 00 00 4c 89 e2 49 89 6d 00 48 b8 00 00 00 RSP: 0018:ffff888016087338 EFLAGS: 00010256 RAX: dffffc0000000000 RBX: ffff88800a160880 RCX: ffffffff841ccd86 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88800a1608b0 RBP: ffff88800a161128 R08: 0000000000000001 R09: fffffbfff0f10c90 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800a1608b0 R13: 0000000000000000 R14: ffff88800a161130 R15: 0000000000000000 FS: 00007fe821c13700(0000) GS:ffff8880e56e5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f859f149018 CR3: 000000000d782000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: 89 f2 mov %esi,%edx 2: 48 c1 ea 03 shr $0x3,%rdx 6: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) a: 0f 85 e9 05 00 00 jne 0x5f9 10: 48 8b 44 24 28 mov 0x28(%rsp),%rax 15: 4c 8b 68 30 mov 0x30(%rax),%r13 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 4c 89 ea mov %r13,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 b8 05 00 00 jne 0x5ec 34: 4c 89 e2 mov %r12,%rdx 37: 49 89 6d 00 mov %rbp,0x0(%r13) 3b: 48 rex.W 3c: b8 .byte 0xb8 3d: 00 00 add %al,(%rax)