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BUG: KASAN: use-after-free in rose_get_neigh+0x1a4/0x5ac net/rose/rose_route.c:690
Read of size 1 at addr ffff0000cefd4430 by task syz.4.877/8420

CPU: 0 PID: 8420 Comm: syz.4.877 Not tainted 5.15.179-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x174/0x1e4 mm/kasan/report.c:451
 __asan_report_load1_noabort+0x44/0x50 mm/kasan/report_generic.c:306
 rose_get_neigh+0x1a4/0x5ac net/rose/rose_route.c:690
 rose_connect+0x3b4/0xe38 net/rose/af_rose.c:814
 __sys_connect_file net/socket.c:1923 [inline]
 __sys_connect+0x268/0x290 net/socket.c:1940
 __do_sys_connect net/socket.c:1950 [inline]
 __se_sys_connect net/socket.c:1947 [inline]
 __arm64_sys_connect+0x7c/0x94 net/socket.c:1947
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Allocated by task 8199:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc+0xbc/0xfc mm/kasan/common.c:513
 __kasan_kmalloc+0x10/0x1c mm/kasan/common.c:522
 kasan_kmalloc include/linux/kasan.h:264 [inline]
 __kmalloc_node_track_caller+0x234/0x448 mm/slub.c:4963
 kmalloc_reserve+0xe8/0x270 net/core/skbuff.c:356
 __alloc_skb+0x1a4/0x584 net/core/skbuff.c:427
 __netdev_alloc_skb+0xb8/0x3c8 net/core/skbuff.c:494
 netdev_alloc_skb include/linux/skbuff.h:3001 [inline]
 dev_alloc_skb include/linux/skbuff.h:3014 [inline]
 __ieee80211_beacon_get+0x940/0x1b54 net/mac80211/tx.c:5080
 ieee80211_beacon_get_tim+0xb8/0x840 net/mac80211/tx.c:5194
 ieee80211_beacon_get include/net/mac80211.h:4981 [inline]
 mac80211_hwsim_beacon_tx+0x110/0x7d4 drivers/net/wireless/mac80211_hwsim.c:1812
 __iterate_interfaces+0x204/0x484 net/mac80211/util.c:793
 ieee80211_iterate_active_interfaces_atomic+0xd4/0x180 net/mac80211/util.c:829
 mac80211_hwsim_beacon+0xa0/0x184 drivers/net/wireless/mac80211_hwsim.c:1865
 __run_hrtimer kernel/time/hrtimer.c:1688 [inline]
 __hrtimer_run_queues+0x484/0xca4 kernel/time/hrtimer.c:1752
 hrtimer_run_softirq+0x158/0x21c kernel/time/hrtimer.c:1769
 handle_softirqs+0x384/0xdbc kernel/softirq.c:558
 __do_softirq kernel/softirq.c:592 [inline]
 do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
 invoke_softirq kernel/softirq.c:439 [inline]
 __irq_exit_rcu+0x268/0x4d8 kernel/softirq.c:641
 irq_exit+0x14/0x88 kernel/softirq.c:665
 handle_domain_irq+0x14c/0x1fc kernel/irq/irqdesc.c:711
 gic_handle_irq+0x78/0x1c8 drivers/irqchip/irq-gic-v3.c:765

The buggy address belongs to the object at ffff0000cefd4400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 48 bytes inside of
 512-byte region [ffff0000cefd4400, ffff0000cefd4600)
The buggy address belongs to the page:
page:000000001efd5e9e refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000cefd5c00 pfn:0x10efd4
head:000000001efd5e9e order:2 compound_mapcount:0 compound_pincount:0
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 fffffc000394a508 fffffc0003999f08 ffff0000c0002600
raw: ffff0000cefd5c00 0000000000100008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000cefd4300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000cefd4380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000cefd4400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff0000cefd4480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000cefd4500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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