=====================================================
BUG: KMSAN: uninit-value in string_nocheck lib/vsprintf.c:643 [inline]
BUG: KMSAN: uninit-value in string+0x4ec/0x6f0 lib/vsprintf.c:725
 string_nocheck lib/vsprintf.c:643 [inline]
 string+0x4ec/0x6f0 lib/vsprintf.c:725
 vsnprintf+0x2222/0x3650 lib/vsprintf.c:2806
 seq_vprintf fs/seq_file.c:391 [inline]
 seq_printf+0x314/0x4f0 fs/seq_file.c:406
 proc_keys_show+0x12fb/0x1500 security/keys/proc.c:226
 traverse+0x345/0xd70 fs/seq_file.c:111
 seq_lseek+0x29a/0x4c0 fs/seq_file.c:323
 proc_reg_llseek+0x27a/0x4c0 fs/proc/inode.c:284
 vfs_llseek fs/read_write.c:300 [inline]
 ksys_lseek fs/read_write.c:313 [inline]
 __do_sys_lseek fs/read_write.c:324 [inline]
 __se_sys_lseek fs/read_write.c:322 [inline]
 __x64_sys_lseek+0x31e/0x480 fs/read_write.c:322
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x51/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Local variable ctx created at:
 proc_keys_show+0x94/0x1500 security/keys/proc.c:165
 seq_read_iter+0x1577/0x2150 fs/seq_file.c:272

CPU: 0 PID: 14743 Comm: syz-executor.5 Not tainted 5.18.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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