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BUG: KMSAN: kernel-infoleak-after-free in instrument_copy_to_user include/linux/instrumented.h:114 [inline]
BUG: KMSAN: kernel-infoleak-after-free in copy_to_user_iter lib/iov_iter.c:24 [inline]
BUG: KMSAN: kernel-infoleak-after-free in iterate_ubuf include/linux/iov_iter.h:30 [inline]
BUG: KMSAN: kernel-infoleak-after-free in iterate_and_advance2 include/linux/iov_iter.h:302 [inline]
BUG: KMSAN: kernel-infoleak-after-free in iterate_and_advance include/linux/iov_iter.h:330 [inline]
BUG: KMSAN: kernel-infoleak-after-free in _copy_to_iter+0xef3/0x33f0 lib/iov_iter.c:185
 instrument_copy_to_user include/linux/instrumented.h:114 [inline]
 copy_to_user_iter lib/iov_iter.c:24 [inline]
 iterate_ubuf include/linux/iov_iter.h:30 [inline]
 iterate_and_advance2 include/linux/iov_iter.h:302 [inline]
 iterate_and_advance include/linux/iov_iter.h:330 [inline]
 _copy_to_iter+0xef3/0x33f0 lib/iov_iter.c:185
 copy_to_iter include/linux/uio.h:220 [inline]
 simple_copy_to_iter net/core/datagram.c:521 [inline]
 __skb_datagram_iter+0x196/0x12c0 net/core/datagram.c:402
 skb_copy_datagram_iter+0x5b/0x1e0 net/core/datagram.c:535
 skb_copy_datagram_msg include/linux/skbuff.h:4167 [inline]
 packet_recvmsg+0xe2b/0x24e0 net/packet/af_packet.c:3525
 sock_recvmsg_nosec net/socket.c:1065 [inline]
 sock_recvmsg+0x2dc/0x390 net/socket.c:1087
 sock_read_iter+0x2c8/0x360 net/socket.c:1157
 new_sync_read fs/read_write.c:491 [inline]
 vfs_read+0x8ea/0xf90 fs/read_write.c:572
 ksys_read fs/read_write.c:715 [inline]
 __do_sys_read fs/read_write.c:724 [inline]
 __se_sys_read fs/read_write.c:722 [inline]
 __x64_sys_read+0x1fb/0x4d0 fs/read_write.c:722
 x64_sys_call+0x2f9c/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:1
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_free_hook mm/slub.c:2343 [inline]
 slab_free mm/slub.c:4680 [inline]
 kmem_cache_free+0x2a1/0xec0 mm/slub.c:4782
 skb_kfree_head net/core/skbuff.c:1045 [inline]
 skb_free_head+0x13c/0x3a0 net/core/skbuff.c:1059
 skb_release_data+0x9f7/0xac0 net/core/skbuff.c:1086
 skb_release_all net/core/skbuff.c:1151 [inline]
 __kfree_skb+0x6b/0x260 net/core/skbuff.c:1165
 consume_skb+0x83/0x230 net/core/skbuff.c:1397
 mac80211_hwsim_tx_frame+0x2d0/0x390 drivers/net/wireless/virtual/mac80211_hwsim.c:2223
 __mac80211_hwsim_beacon_tx+0x4fa/0x5e0 drivers/net/wireless/virtual/mac80211_hwsim.c:2272
 mac80211_hwsim_beacon_tx+0x755/0xca0 drivers/net/wireless/virtual/mac80211_hwsim.c:2323
 __iterate_interfaces+0x49c/0x750 net/mac80211/util.c:761
 ieee80211_iterate_active_interfaces_atomic+0x3f/0x60 net/mac80211/util.c:797
 mac80211_hwsim_beacon+0xe0/0x2e0 drivers/net/wireless/virtual/mac80211_hwsim.c:2353
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x556/0xd80 kernel/time/hrtimer.c:1825
 hrtimer_run_softirq+0x18e/0x760 kernel/time/hrtimer.c:1842
 handle_softirqs+0x166/0x6e0 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0x66/0x180 kernel/softirq.c:680
 irq_exit_rcu+0x12/0x20 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0x84/0x90 arch/x86/kernel/apic/apic.c:1050
 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:702

Bytes 4-5 of 48 are uninitialized
Memory access of size 48 starts at ffff888062165c04
Data copied to user address 000020000000000a

CPU: 0 UID: 0 PID: 16321 Comm: syz.5.2661 Not tainted syzkaller #0 PREEMPT(none) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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