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BUG: KMSAN: uninit-value in __fcheck_files include/linux/fdtable.h:86 [inline]
BUG: KMSAN: uninit-value in __fget_light+0x607/0x700 fs/file.c:796
CPU: 0 PID: 8807 Comm: syz-executor438 Not tainted 5.7.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c9/0x220 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
 __fcheck_files include/linux/fdtable.h:86 [inline]
 __fget_light+0x607/0x700 fs/file.c:796
 __fdget+0x4e/0x60 fs/file.c:809
 fdget include/linux/file.h:64 [inline]
 bpf_map_get+0x47/0x2b0 kernel/bpf/syscall.c:908
 bpf_sk_storage_diag_alloc+0x49e/0xb40 net/core/bpf_sk_storage.c:1002
 __inet_diag_dump_start+0x68c/0x1190 net/ipv4/inet_diag.c:1130
 inet_diag_dump_start_compat+0x4d/0x60 net/ipv4/inet_diag.c:1149
 __netlink_dump_start+0x633/0xd00 net/netlink/af_netlink.c:2343
 netlink_dump_start include/linux/netlink.h:246 [inline]
 inet_diag_rcv_msg_compat+0x5c1/0x940 net/ipv4/inet_diag.c:1219
 sock_diag_rcv_msg+0x211/0x610 net/core/sock_diag.c:256
 netlink_rcv_skb+0x451/0x650 net/netlink/af_netlink.c:2469
 sock_diag_rcv+0x63/0x80 net/core/sock_diag.c:275
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0xf9e/0x1100 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x1246/0x14d0 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x12b6/0x1350 net/socket.c:2362
 ___sys_sendmsg net/socket.c:2416 [inline]
 __sys_sendmsg+0x623/0x750 net/socket.c:2449
 __compat_sys_sendmsg net/compat.c:658 [inline]
 __do_compat_sys_sendmsg net/compat.c:665 [inline]
 __se_compat_sys_sendmsg+0xa7/0xc0 net/compat.c:662
 __ia32_compat_sys_sendmsg+0x4a/0x70 net/compat.c:662
 do_syscall_32_irqs_on arch/x86/entry/common.c:339 [inline]
 do_fast_syscall_32+0x3bf/0x6d0 arch/x86/entry/common.c:398
 entry_SYSENTER_compat+0x68/0x77 arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f4fdd9
Code: 90 e8 0b 00 00 00 f3 90 0f ae e8 eb f9 8d 74 26 00 89 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000ffd6d5cc EFLAGS: 00000246 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000000
RDX: 0000000000000000 RSI: 00000000080ea078 RDI: 00000000ffd6d620
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_poison_shadow+0x66/0xd0 mm/kmsan/kmsan.c:127
 kmsan_slab_alloc+0x8a/0xe0 mm/kmsan/kmsan_hooks.c:80
 slab_alloc_node mm/slub.c:2802 [inline]
 __kmalloc_node_track_caller+0xb40/0x1200 mm/slub.c:4436
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2fd/0xac0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1083 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1175 [inline]
 netlink_sendmsg+0x7d3/0x14d0 net/netlink/af_netlink.c:1893
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x12b6/0x1350 net/socket.c:2362
 ___sys_sendmsg net/socket.c:2416 [inline]
 __sys_sendmsg+0x623/0x750 net/socket.c:2449
 __compat_sys_sendmsg net/compat.c:658 [inline]
 __do_compat_sys_sendmsg net/compat.c:665 [inline]
 __se_compat_sys_sendmsg+0xa7/0xc0 net/compat.c:662
 __ia32_compat_sys_sendmsg+0x4a/0x70 net/compat.c:662
 do_syscall_32_irqs_on arch/x86/entry/common.c:339 [inline]
 do_fast_syscall_32+0x3bf/0x6d0 arch/x86/entry/common.c:398
 entry_SYSENTER_compat+0x68/0x77 arch/x86/entry/entry_64_compat.S:139
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