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BUG: KASAN: use-after-free in rose_timer_expiry+0x404/0x45c net/rose/rose_timer.c:183
Read of size 2 at addr ffff0000f37f982a by task ksoftirqd/1/21

CPU: 1 PID: 21 Comm: ksoftirqd/1 Not tainted 6.1.147-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 print_address_description+0x88/0x200 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:418
 kasan_report+0xa8/0x100 mm/kasan/report.c:522
 __asan_report_load2_noabort+0x2c/0x38 mm/kasan/report_generic.c:349
 rose_timer_expiry+0x404/0x45c net/rose/rose_timer.c:183
 call_timer_fn+0x1b8/0x964 kernel/time/timer.c:1504
 expire_timers kernel/time/timer.c:1549 [inline]
 __run_timers+0x460/0x6bc kernel/time/timer.c:1820
 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1833
 handle_softirqs+0x318/0xc6c kernel/softirq.c:596
 run_ksoftirqd+0x7c/0x2a0 kernel/softirq.c:963
 smpboot_thread_fn+0x4b0/0x964 kernel/smpboot.c:164
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:849

Allocated by task 6774:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:52
 kasan_save_alloc_info+0x28/0x34 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:936 [inline]
 __kmalloc_node_track_caller+0xe0/0x16c mm/slab_common.c:956
 kmalloc_reserve net/core/skbuff.c:446 [inline]
 __alloc_skb+0x264/0x718 net/core/skbuff.c:515
 __netdev_alloc_skb+0xb8/0x3c4 net/core/skbuff.c:579
 netdev_alloc_skb include/linux/skbuff.h:3206 [inline]
 dev_alloc_skb include/linux/skbuff.h:3219 [inline]
 __ieee80211_beacon_get+0x71c/0x19cc net/mac80211/tx.c:5260
 ieee80211_beacon_get_tim+0x68/0x444 net/mac80211/tx.c:5342
 ieee80211_beacon_get include/net/mac80211.h:5262 [inline]
 mac80211_hwsim_beacon_tx+0x1e8/0x914 drivers/net/wireless/mac80211_hwsim.c:2091
 __iterate_interfaces+0x204/0x484 net/mac80211/util.c:788
 ieee80211_iterate_active_interfaces_atomic+0xd4/0x180 net/mac80211/util.c:824
 mac80211_hwsim_beacon+0xc8/0x1b8 drivers/net/wireless/mac80211_hwsim.c:2147
 __run_hrtimer kernel/time/hrtimer.c:1752 [inline]
 __hrtimer_run_queues+0x44c/0xc64 kernel/time/hrtimer.c:1816
 hrtimer_run_softirq+0x160/0x400 kernel/time/hrtimer.c:1833
 handle_softirqs+0x318/0xc6c kernel/softirq.c:596
 __do_softirq+0x14/0x20 kernel/softirq.c:630

Freed by task 6774:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:52
 kasan_save_free_info+0x3c/0x60 mm/kasan/generic.c:516
 ____kasan_slab_free+0x148/0x1b0 mm/kasan/common.c:236
 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1724 [inline]
 slab_free_freelist_hook+0x16c/0x1ec mm/slub.c:1750
 slab_free mm/slub.c:3661 [inline]
 __kmem_cache_free+0xc0/0x224 mm/slub.c:3674
 kfree+0xd0/0x1ac mm/slab_common.c:988
 skb_free_head net/core/skbuff.c:762 [inline]
 skb_release_data+0x43c/0x648 net/core/skbuff.c:791
 skb_release_all net/core/skbuff.c:856 [inline]
 __kfree_skb net/core/skbuff.c:870 [inline]
 consume_skb+0xa0/0x104 net/core/skbuff.c:1035
 mac80211_hwsim_tx_frame+0x1c8/0x1f4 drivers/net/wireless/mac80211_hwsim.c:2059
 mac80211_hwsim_beacon_tx+0x4c8/0x914 drivers/net/wireless/mac80211_hwsim.c:2121
 __iterate_interfaces+0x204/0x484 net/mac80211/util.c:788
 ieee80211_iterate_active_interfaces_atomic+0xd4/0x180 net/mac80211/util.c:824
 mac80211_hwsim_beacon+0xc8/0x1b8 drivers/net/wireless/mac80211_hwsim.c:2147
 __run_hrtimer kernel/time/hrtimer.c:1752 [inline]
 __hrtimer_run_queues+0x44c/0xc64 kernel/time/hrtimer.c:1816
 hrtimer_run_softirq+0x160/0x400 kernel/time/hrtimer.c:1833
 handle_softirqs+0x318/0xc6c kernel/softirq.c:596
 __do_softirq+0x14/0x20 kernel/softirq.c:630

The buggy address belongs to the object at ffff0000f37f9800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
 512-byte region [ffff0000f37f9800, ffff0000f37f9a00)

The buggy address belongs to the physical page:
page:0000000078d859a2 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1337f8
head:0000000078d859a2 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 fffffc0003c89e00 dead000000000002 ffff0000c0002600
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000f37f9700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000f37f9780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000f37f9800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff0000f37f9880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000f37f9900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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