================================================================== BUG: KASAN: slab-out-of-bounds in csum_partial_copy_nocheck include/net/checksum.h:53 [inline] BUG: KASAN: slab-out-of-bounds in skb_copy_and_csum_bits+0x433/0x9c0 net/core/skbuff.c:3620 Write of size 1144 at addr ffff8880484cf624 by task syz.8.4269/21185 CPU: 0 UID: 0 PID: 21185 Comm: syz.8.4269 Not tainted 6.12.0-rc5-next-20241030-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106 csum_partial_copy_nocheck include/net/checksum.h:53 [inline] skb_copy_and_csum_bits+0x433/0x9c0 net/core/skbuff.c:3620 __ip_append_data+0x2fc1/0x40f0 net/ipv4/ip_output.c:1159 ip_append_data+0x14c/0x190 net/ipv4/ip_output.c:1375 udp_sendmsg+0x52c/0x2a50 net/ipv4/udp.c:1298 sock_sendmsg_nosec net/socket.c:729 [inline] __sock_sendmsg+0x1a6/0x270 net/socket.c:744 sock_sendmsg+0x134/0x200 net/socket.c:767 splice_to_socket+0xa10/0x10b0 fs/splice.c:889 do_splice_from fs/splice.c:941 [inline] do_splice+0xd68/0x18e0 fs/splice.c:1354 __do_splice fs/splice.c:1436 [inline] __do_sys_splice fs/splice.c:1652 [inline] __se_sys_splice+0x331/0x4a0 fs/splice.c:1634 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f78b0f7e719 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:00007f78b1d83038 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007f78b1136130 RCX: 00007f78b0f7e719 RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f78b0ff132e R08: 0000000000007151 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f78b1136130 R15: 00007ffcb49e7458 Allocated by task 21185: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4104 [inline] slab_alloc_node mm/slub.c:4153 [inline] kmem_cache_alloc_node_noprof+0x1d9/0x380 mm/slub.c:4205 kmalloc_reserve+0xa8/0x2a0 net/core/skbuff.c:587 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:678 alloc_skb include/linux/skbuff.h:1322 [inline] __ip_append_data+0x2da7/0x40f0 net/ipv4/ip_output.c:1134 ip_append_data+0x14c/0x190 net/ipv4/ip_output.c:1375 udp_sendmsg+0x52c/0x2a50 net/ipv4/udp.c:1298 sock_sendmsg_nosec net/socket.c:729 [inline] __sock_sendmsg+0x1a6/0x270 net/socket.c:744 sock_sendmsg+0x134/0x200 net/socket.c:767 splice_to_socket+0xa10/0x10b0 fs/splice.c:889 do_splice_from fs/splice.c:941 [inline] do_splice+0xd68/0x18e0 fs/splice.c:1354 __do_splice fs/splice.c:1436 [inline] __do_sys_splice fs/splice.c:1652 [inline] __se_sys_splice+0x331/0x4a0 fs/splice.c:1634 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880484cf600 which belongs to the cache skbuff_small_head of size 640 The buggy address is located 36 bytes inside of allocated 640-byte region [ffff8880484cf600, ffff8880484cf880) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x484cc head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff8881416f6a00 ffffea0001c2a600 dead000000000002 raw: 0000000000000000 0000000080150015 00000001f5000000 0000000000000000 head: 00fff00000000040 ffff8881416f6a00 ffffea0001c2a600 dead000000000002 head: 0000000000000000 0000000080150015 00000001f5000000 0000000000000000 head: 00fff00000000002 ffffea0001213301 ffffffffffffffff 0000000000000000 head: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xf2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_MEMALLOC), pid 17113, tgid 17107 (syz.8.3163), ts 526141882152, free_ts 15998945277 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1541 prep_new_page mm/page_alloc.c:1549 [inline] get_page_from_freelist+0x3725/0x3870 mm/page_alloc.c:3495 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4771 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 alloc_slab_page+0x6a/0x140 mm/slub.c:2408 allocate_slab+0x5a/0x2f0 mm/slub.c:2574 new_slab mm/slub.c:2627 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3815 __slab_alloc+0x58/0xa0 mm/slub.c:3905 __slab_alloc_node mm/slub.c:3980 [inline] slab_alloc_node mm/slub.c:4141 [inline] kmem_cache_alloc_node_noprof+0x269/0x380 mm/slub.c:4205 kmalloc_reserve+0xa8/0x2a0 net/core/skbuff.c:587 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:678 __netdev_alloc_skb+0x104/0xa10 net/core/skbuff.c:742 netdev_alloc_skb include/linux/skbuff.h:3370 [inline] dev_alloc_skb include/linux/skbuff.h:3383 [inline] __ieee80211_beacon_get+0x998/0x15c0 net/mac80211/tx.c:5474 ieee80211_beacon_get_tim+0xb4/0x320 net/mac80211/tx.c:5596 ieee80211_beacon_get include/net/mac80211.h:5632 [inline] mac80211_hwsim_beacon_tx+0x39d/0x850 drivers/net/wireless/virtual/mac80211_hwsim.c:2311 __iterate_interfaces+0x297/0x570 net/mac80211/util.c:775 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:1112 [inline] free_unref_page+0xcfb/0xf20 mm/page_alloc.c:2678 free_contig_range+0x152/0x550 mm/page_alloc.c:6786 destroy_args+0x92/0x910 mm/debug_vm_pgtable.c:1017 debug_vm_pgtable+0x4be/0x550 mm/debug_vm_pgtable.c:1397 do_one_initcall+0x248/0x880 init/main.c:1266 do_initcall_level+0x157/0x210 init/main.c:1328 do_initcalls+0x3f/0x80 init/main.c:1344 kernel_init_freeable+0x435/0x5d0 init/main.c:1577 kernel_init+0x1d/0x2b0 init/main.c:1466 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff8880484cf780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880484cf800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880484cf880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880484cf900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880484cf980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================