=====================================================
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_iovec include/linux/iov_iter.h:52 [inline]
BUG: KMSAN: kernel-infoleak-after-free in iterate_and_advance2 include/linux/iov_iter.h:304 [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+0x4e4/0x33f0 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_iovec include/linux/iov_iter.h:52 [inline]
 iterate_and_advance2 include/linux/iov_iter.h:304 [inline]
 iterate_and_advance include/linux/iov_iter.h:330 [inline]
 _copy_to_iter+0x4e4/0x33f0 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:4217 [inline]
 packet_recvmsg+0xe2b/0x24e0 net/packet/af_packet.c:3471
 sock_recvmsg_nosec net/socket.c:1078 [inline]
 sock_recvmsg+0x2df/0x390 net/socket.c:1100
 sock_read_iter+0x2c8/0x360 net/socket.c:1170
 do_iter_readv_writev+0x9e1/0xc20 fs/read_write.c:-1
 vfs_readv+0x34a/0xf30 fs/read_write.c:1018
 do_readv+0x1b5/0x580 fs/read_write.c:1080
 __do_sys_readv fs/read_write.c:1165 [inline]
 __se_sys_readv fs/read_write.c:1162 [inline]
 __ia32_sys_readv+0x9c/0xf0 fs/read_write.c:1162
 ia32_sys_call+0x40c0/0x4310 arch/x86/include/generated/asm/syscalls_32.h:146
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0xb0/0x150 arch/x86/entry/syscall_32.c:306
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Uninit was created at:
 slab_free_hook mm/slub.c:2465 [inline]
 slab_free mm/slub.c:6630 [inline]
 kmem_cache_free+0x2b0/0x1490 mm/slub.c:6740
 skb_kfree_head net/core/skbuff.c:1046 [inline]
 skb_free_head+0x13c/0x3a0 net/core/skbuff.c:1060
 skb_release_data+0x9f7/0xac0 net/core/skbuff.c:1087
 skb_release_all net/core/skbuff.c:1152 [inline]
 __kfree_skb+0x6b/0x260 net/core/skbuff.c:1166
 consume_skb+0x83/0x230 net/core/skbuff.c:1398
 skb_free_datagram+0x1e/0x30 net/core/datagram.c:324
 netlink_recvmsg+0xad1/0xfe0 net/netlink/af_netlink.c:1974
 sock_recvmsg_nosec net/socket.c:1078 [inline]
 sock_recvmsg+0x2df/0x390 net/socket.c:1100
 __sys_recvfrom+0x282/0x550 net/socket.c:2294
 __compat_sys_recvfrom net/compat.c:389 [inline]
 __do_compat_sys_socketcall net/compat.c:-1 [inline]
 __se_compat_sys_socketcall net/compat.c:423 [inline]
 __ia32_compat_sys_socketcall+0x1058/0x1af0 net/compat.c:423
 ia32_sys_call+0x2942/0x4310 arch/x86/include/generated/asm/syscalls_32.h:103
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0xb0/0x150 arch/x86/entry/syscall_32.c:306
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Bytes 4-5 of 120 are uninitialized
Memory access of size 120 starts at ffff88811468af64
Data copied to user address 000000008000038c

CPU: 0 UID: 0 PID: 8899 Comm: syz.0.1235 Not tainted syzkaller #0 PREEMPT(none) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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