linux-kernel - [PATCH] isofs: prevent file time rollover after year 2038

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Date:   Thu, 20 Oct 2022 18:00:29 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-fsdevel@...r.kernel.org, Thomas Schmitt <scdbackup@....net>,
        stable@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Jan Kara <jack@...e.cz>, Jeff Layton <jlayton@...nel.org>,
        Deepa Dinamani <deepa.kernel@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] isofs: prevent file time rollover after year 2038

From: Thomas Schmitt <scdbackup@....net>

Change the return type of function iso_date() from int to time64_t,
to avoid truncating to the 1902..2038 date range.

After this patch, the reported timestamps should fall into the
range reported in the s_time_min/s_time_max fields.

Signed-off-by: Thomas Schmitt <scdbackup@....net>
Cc: stable@...r.kernel.org
Link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=800627
Fixes: 34be4dbf87fc ("isofs: fix timestamps beyond 2027")
Fixes: 5ad32b3acded ("isofs: Initialize filesystem timestamp ranges")
[arnd: expand changelog text slightly]
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 fs/isofs/isofs.h | 2 +-
 fs/isofs/util.c  | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/isofs/isofs.h b/fs/isofs/isofs.h
index dcdc191ed183..c3473ca3f686 100644
--- a/fs/isofs/isofs.h
+++ b/fs/isofs/isofs.h
@@ -106,7 +106,7 @@ static inline unsigned int isonum_733(u8 *p)
 	/* Ignore bigendian datum due to broken mastering programs */
 	return get_unaligned_le32(p);
 }
-extern int iso_date(u8 *, int);
+extern time64_t iso_date(u8 *, int);
 
 struct inode;		/* To make gcc happy */
 
diff --git a/fs/isofs/util.c b/fs/isofs/util.c
index e88dba721661..348af786a8a4 100644
--- a/fs/isofs/util.c
+++ b/fs/isofs/util.c
@@ -16,10 +16,10 @@
  * to GMT.  Thus  we should always be correct.
  */
 
-int iso_date(u8 *p, int flag)
+time64_t iso_date(u8 *p, int flag)
 {
 	int year, month, day, hour, minute, second, tz;
-	int crtime;
+	time64_t crtime;
 
 	year = p[0];
 	month = p[1];
-- 
2.29.2