================================================================== BUG: KASAN: slab-out-of-bounds in cfg80211_wext_freq+0x1f9/0x240 net/wireless/wext-compat.c:238 Read of size 2 at addr ffff88807d897940 by task syz-executor.2/8115 CPU: 1 PID: 8115 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+0x241/0x360 lib/dump_stack.c:114 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 cfg80211_wext_freq+0x1f9/0x240 net/wireless/wext-compat.c:238 cfg80211_wext_siwscan+0x4fd/0x10d0 net/wireless/scan.c:3463 ioctl_standard_iw_point+0x788/0xcb0 net/wireless/wext-core.c:867 ioctl_standard_call+0xc7/0x290 net/wireless/wext-core.c:1052 wext_ioctl_dispatch+0x58e/0x640 net/wireless/wext-core.c:1016 wext_handle_ioctl+0x15f/0x270 net/wireless/wext-core.c:1077 sock_ioctl+0x17f/0x8e0 net/socket.c:1275 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 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: 0033:0x7fdc0027cea9 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:00007fdc0109f0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fdc003b3f80 RCX: 00007fdc0027cea9 RDX: 0000000020000000 RSI: 0000000000008b18 RDI: 0000000000000004 RBP: 00007fdc002ebff4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fdc003b3f80 R15: 00007fffd3dedd68 Allocated by task 8115: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4122 [inline] __kmalloc_noprof+0x1f9/0x400 mm/slub.c:4135 kmalloc_noprof include/linux/slab.h:664 [inline] kzalloc_noprof include/linux/slab.h:778 [inline] ioctl_standard_iw_point+0x4ae/0xcb0 net/wireless/wext-core.c:828 ioctl_standard_call+0xc7/0x290 net/wireless/wext-core.c:1052 wext_ioctl_dispatch+0x58e/0x640 net/wireless/wext-core.c:1016 wext_handle_ioctl+0x15f/0x270 net/wireless/wext-core.c:1077 sock_ioctl+0x17f/0x8e0 net/socket.c:1275 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 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 ffff88807d897800 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 [ffff88807d897800, ffff88807d89793c) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7d894 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 ffff888015041c80 dead000000000100 dead000000000122 raw: 0000000000000000 0000000080100010 00000001ffffefff 0000000000000000 head: 00fff00000000040 ffff888015041c80 dead000000000100 dead000000000122 head: 0000000000000000 0000000080100010 00000001ffffefff 0000000000000000 head: 00fff00000000002 ffffea0001f62501 ffffffffffffffff 0000000000000000 head: ffff888000000004 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4537, tgid 4537 (udevd), ts 30208728724, free_ts 28254490023 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1468 prep_new_page mm/page_alloc.c:1476 [inline] get_page_from_freelist+0x2e43/0x2f00 mm/page_alloc.c:3420 __alloc_pages_noprof+0x256/0x6c0 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+0x5f/0x120 mm/slub.c:2265 allocate_slab+0x5a/0x2f0 mm/slub.c:2428 new_slab mm/slub.c:2481 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3667 __slab_alloc+0x58/0xa0 mm/slub.c:3757 __slab_alloc_node mm/slub.c:3810 [inline] slab_alloc_node mm/slub.c:3989 [inline] kmalloc_trace_noprof+0x1d5/0x2c0 mm/slub.c:4148 kmalloc_noprof include/linux/slab.h:660 [inline] kzalloc_noprof include/linux/slab.h:778 [inline] kernfs_fop_open+0x3e0/0xd10 fs/kernfs/file.c:623 do_dentry_open+0x95a/0x1720 fs/open.c:955 do_open fs/namei.c:3650 [inline] path_openat+0x289f/0x3280 fs/namei.c:3807 do_filp_open+0x235/0x490 fs/namei.c:3834 do_sys_openat2+0x13e/0x1d0 fs/open.c:1405 do_sys_open fs/open.c:1420 [inline] __do_sys_openat fs/open.c:1436 [inline] __se_sys_openat fs/open.c:1431 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1431 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 page last free pid 16 tgid 16 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1088 [inline] free_unref_page+0xd19/0xea0 mm/page_alloc.c:2583 rcu_do_batch kernel/rcu/tree.c:2535 [inline] rcu_core+0xafd/0x1830 kernel/rcu/tree.c:2809 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 run_ksoftirqd+0xca/0x130 kernel/softirq.c:928 smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164 kthread+0x2f0/0x390 kernel/kthread.c:389 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: ffff88807d897800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807d897880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88807d897900: 00 00 00 00 00 00 00 04 fc fc fc fc fc fc fc fc ^ ffff88807d897980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807d897a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================