================================================================== BUG: KASAN: slab-out-of-bounds in cfg80211_wext_freq+0x1a0/0x1c0 net/wireless/wext-compat.c:238 Read of size 2 at addr ffff8880667e6d40 by task syz-executor.2/1601 CPU: 0 PID: 1601 Comm: syz-executor.2 Not tainted 6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 cfg80211_wext_freq+0x1a0/0x1c0 net/wireless/wext-compat.c:238 cfg80211_wext_siwscan+0x6e2/0xf30 net/wireless/scan.c:3463 ioctl_standard_iw_point+0x599/0xc10 net/wireless/wext-core.c:867 ioctl_standard_call+0x191/0x210 net/wireless/wext-core.c:1052 wireless_process_ioctl+0x4e3/0x5e0 net/wireless/wext-core.c:983 wext_ioctl_dispatch net/wireless/wext-core.c:1016 [inline] wext_ioctl_dispatch net/wireless/wext-core.c:1004 [inline] wext_handle_ioctl+0x23d/0x2c0 net/wireless/wext-core.c:1077 sock_ioctl+0x3ac/0x6c0 net/socket.c:1275 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __x64_sys_ioctl+0x193/0x220 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fcaff07cea9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fcaffe610c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fcaff1b41f0 RCX: 00007fcaff07cea9 RDX: 0000000020000000 RSI: 0000000000008b18 RDI: 0000000000000003 RBP: 00007fcaff0ebff4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007fcaff1b41f0 R15: 00007ffe35d45418 Allocated by task 1601: 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:370 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4122 [inline] __kmalloc_noprof+0x1ec/0x410 mm/slub.c:4135 kmalloc_noprof include/linux/slab.h:664 [inline] kzalloc_noprof include/linux/slab.h:778 [inline] ioctl_standard_iw_point+0x3c6/0xc10 net/wireless/wext-core.c:828 ioctl_standard_call+0x191/0x210 net/wireless/wext-core.c:1052 wireless_process_ioctl+0x4e3/0x5e0 net/wireless/wext-core.c:983 wext_ioctl_dispatch net/wireless/wext-core.c:1016 [inline] wext_ioctl_dispatch net/wireless/wext-core.c:1004 [inline] wext_handle_ioctl+0x23d/0x2c0 net/wireless/wext-core.c:1077 sock_ioctl+0x3ac/0x6c0 net/socket.c:1275 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __x64_sys_ioctl+0x193/0x220 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880667e6c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 4 bytes to the right of allocated 316-byte region [ffff8880667e6c00, ffff8880667e6d3c) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x667e4 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: 0xffffefff(slab) raw: 00fff00000000040 ffff888015441c80 ffffea0000b20300 dead000000000002 raw: 0000000000000000 0000000080100010 00000001ffffefff 0000000000000000 head: 00fff00000000040 ffff888015441c80 ffffea0000b20300 dead000000000002 head: 0000000000000000 0000000080100010 00000001ffffefff 0000000000000000 head: 00fff00000000002 ffffea000199f901 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 30196, tgid 30196 (syz-executor.1), ts 2984909825960, free_ts 2984688050017 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1468 prep_new_page mm/page_alloc.c:1476 [inline] get_page_from_freelist+0x136a/0x2e50 mm/page_alloc.c:3420 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4678 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x56/0x110 mm/slub.c:2265 allocate_slab mm/slub.c:2428 [inline] new_slab+0x84/0x260 mm/slub.c:2481 ___slab_alloc+0xdac/0x1870 mm/slub.c:3667 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3757 __slab_alloc_node mm/slub.c:3810 [inline] slab_alloc_node mm/slub.c:3989 [inline] __do_kmalloc_node mm/slub.c:4121 [inline] __kmalloc_noprof+0x36d/0x410 mm/slub.c:4135 kmalloc_noprof include/linux/slab.h:664 [inline] kzalloc_noprof include/linux/slab.h:778 [inline] fib6_info_alloc+0x40/0x160 net/ipv6/ip6_fib.c:155 ip6_route_info_create+0x337/0x1940 net/ipv6/route.c:3761 ip6_route_add+0x26/0x190 net/ipv6/route.c:3853 addrconf_add_mroute+0x1de/0x350 net/ipv6/addrconf.c:2549 addrconf_add_dev+0x14e/0x1c0 net/ipv6/addrconf.c:2567 inet6_addr_add+0x1a8/0xbe0 net/ipv6/addrconf.c:3023 inet6_rtm_newaddr+0x11e7/0x1ab0 net/ipv6/addrconf.c:5047 rtnetlink_rcv_msg+0x3c7/0xea0 net/core/rtnetlink.c:6635 page last free pid 30219 tgid 30219 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1088 [inline] free_unref_page+0x64a/0xe40 mm/page_alloc.c:2583 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3941 [inline] slab_alloc_node mm/slub.c:4001 [inline] kmem_cache_alloc_noprof+0x121/0x2f0 mm/slub.c:4008 add+0x9e7/0x1820 drivers/net/wireguard/allowedips.c:190 wg_allowedips_insert_v4+0xde/0x130 drivers/net/wireguard/allowedips.c:289 set_allowedip drivers/net/wireguard/netlink.c:343 [inline] set_peer+0x1266/0x1490 drivers/net/wireguard/netlink.c:463 wg_set_device+0x8e3/0x13e0 drivers/net/wireguard/netlink.c:592 genl_family_rcv_msg_doit+0x202/0x2f0 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x565/0x800 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2564 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline] netlink_unicast+0x542/0x820 net/netlink/af_netlink.c:1361 netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1905 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] __sys_sendto+0x47f/0x4e0 net/socket.c:2192 Memory state around the buggy address: ffff8880667e6c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880667e6c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880667e6d00: 00 00 00 00 00 00 00 04 fc fc fc fc fc fc fc fc ^ ffff8880667e6d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880667e6e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================