From d5bd821350e69f5f464c175455135727f986f793 Mon Sep 17 00:00:00 2001
From: Jan Kara <jack@suse.cz>
Date: Tue, 19 Dec 2017 08:11:01 +0100
Subject: [PATCH] udf: Sanitize nanoseconds for time stamps

Reportedly some UDF filesystems are recorded with bogus subsecond values
resulting in nanoseconds being over 10^9. Sanitize nanoseconds in time
stamps when loading them from disk.

Reported-by: Ian Turner <vectro@vectro.org>
Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/udf/udftime.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/udf/udftime.c b/fs/udf/udftime.c
index 14626b34d13e..0927a4b2ecaf 100644
--- a/fs/udf/udftime.c
+++ b/fs/udf/udftime.c
@@ -62,6 +62,11 @@ udf_disk_stamp_to_time(struct timespec *dest, struct timestamp src)
 	dest->tv_sec -= offset * 60;
 	dest->tv_nsec = 1000 * (src.centiseconds * 10000 +
 			src.hundredsOfMicroseconds * 100 + src.microseconds);
+	/*
+	 * Sanitize nanosecond field since reportedly some filesystems are
+	 * recorded with bogus sub-second values.
+	 */
+	dest->tv_nsec %= NSEC_PER_SEC;
 	return dest;
 }