=====================================================
BUG: KMSAN: uninit-value in __fget_files_rcu fs/file.c:881 [inline]
BUG: KMSAN: uninit-value in __fget_files+0x66f/0x6c0 fs/file.c:934
 __fget_files_rcu fs/file.c:881 [inline]
 __fget_files+0x66f/0x6c0 fs/file.c:934
 __fget fs/file.c:943 [inline]
 __fget_light fs/file.c:1038 [inline]
 __fdget+0x31d/0x420 fs/file.c:1046
 fdget include/linux/file.h:65 [inline]
 bpf_map_get+0x47/0x330 kernel/bpf/syscall.c:977
 bpf_sk_storage_diag_alloc+0x62f/0xe50 net/core/bpf_sk_storage.c:550
 __inet_diag_dump_start+0x753/0x18a0 net/ipv4/inet_diag.c:1230
 inet_diag_dump_start_compat+0x4d/0x60 net/ipv4/inet_diag.c:1249
 __netlink_dump_start+0x6f4/0xe90 net/netlink/af_netlink.c:2365
 netlink_dump_start include/linux/netlink.h:245 [inline]
 inet_diag_rcv_msg_compat+0x337/0x690 net/ipv4/inet_diag.c:1320
 sock_diag_rcv_msg+0x24a/0x620
 netlink_rcv_skb+0x40c/0x7e0 net/netlink/af_netlink.c:2496
 sock_diag_rcv+0x63/0x80 net/core/sock_diag.c:277
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x109c/0x1370 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x14dc/0x1720 net/netlink/af_netlink.c:1921
 sock_sendmsg_nosec net/socket.c:705 [inline]
 sock_sendmsg net/socket.c:725 [inline]
 ____sys_sendmsg+0xe11/0x12c0 net/socket.c:2413
 ___sys_sendmsg net/socket.c:2467 [inline]
 __sys_sendmsg+0x704/0x840 net/socket.c:2496
 __compat_sys_sendmsg net/compat.c:347 [inline]
 __do_compat_sys_sendmsg net/compat.c:354 [inline]
 __se_compat_sys_sendmsg net/compat.c:351 [inline]
 __ia32_compat_sys_sendmsg+0xed/0x130 net/compat.c:351
 do_syscall_32_irqs_on arch/x86/entry/common.c:113 [inline]
 __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:179
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:204
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:247
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Uninit was created at:
 slab_post_alloc_hook mm/slab.h:754 [inline]
 slab_alloc_node mm/slub.c:3231 [inline]
 __kmalloc_node_track_caller+0xde3/0x14f0 mm/slub.c:4962
 kmalloc_reserve net/core/skbuff.c:354 [inline]
 __alloc_skb+0x545/0xf90 net/core/skbuff.c:426
 alloc_skb include/linux/skbuff.h:1300 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1191 [inline]
 netlink_sendmsg+0xde3/0x1720 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:705 [inline]
 sock_sendmsg net/socket.c:725 [inline]
 ____sys_sendmsg+0xe11/0x12c0 net/socket.c:2413
 ___sys_sendmsg net/socket.c:2467 [inline]
 __sys_sendmsg+0x704/0x840 net/socket.c:2496
 __compat_sys_sendmsg net/compat.c:347 [inline]
 __do_compat_sys_sendmsg net/compat.c:354 [inline]
 __se_compat_sys_sendmsg net/compat.c:351 [inline]
 __ia32_compat_sys_sendmsg+0xed/0x130 net/compat.c:351
 do_syscall_32_irqs_on arch/x86/entry/common.c:113 [inline]
 __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:179
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:204
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:247
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

CPU: 0 PID: 10215 Comm: syz-executor.2 Not tainted 5.18.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================