a8e86c7d9c
[ Upstream commit 3b84adf460381169c085e4bc09e7b57e9e16db0a ] An overflow can occur in a situation where src.centiseconds takes the value of 255. This situation is unlikely, but there is no validation check anywere in the code. Found by Linux Verification Center (linuxtesting.org) with Svace. Suggested-by: Jan Kara <jack@suse.cz> Signed-off-by: Roman Smirnov <r.smirnov@omp.ru> Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru> Signed-off-by: Jan Kara <jack@suse.cz> Message-Id: <20240327132755.13945-1-r.smirnov@omp.ru> Signed-off-by: Sasha Levin <sashal@kernel.org>
103 lines
3.3 KiB
C
Executable file
103 lines
3.3 KiB
C
Executable file
/* Copyright (C) 1993, 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Paul Eggert (eggert@twinsun.com).
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/*
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* dgb 10/02/98: ripped this from glibc source to help convert timestamps
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* to unix time
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* 10/04/98: added new table-based lookup after seeing how ugly
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* the gnu code is
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* blf 09/27/99: ripped out all the old code and inserted new table from
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* John Brockmeyer (without leap second corrections)
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* rewrote udf_stamp_to_time and fixed timezone accounting in
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* udf_time_to_stamp.
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*/
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/*
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* We don't take into account leap seconds. This may be correct or incorrect.
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* For more NIST information (especially dealing with leap seconds), see:
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* http://www.boulder.nist.gov/timefreq/pubs/bulletin/leapsecond.htm
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*/
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#include "udfdecl.h"
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/time.h>
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void
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udf_disk_stamp_to_time(struct timespec64 *dest, struct timestamp src)
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{
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u16 typeAndTimezone = le16_to_cpu(src.typeAndTimezone);
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u16 year = le16_to_cpu(src.year);
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uint8_t type = typeAndTimezone >> 12;
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int16_t offset;
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if (type == 1) {
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offset = typeAndTimezone << 4;
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/* sign extent offset */
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offset = (offset >> 4);
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if (offset == -2047) /* unspecified offset */
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offset = 0;
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} else
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offset = 0;
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dest->tv_sec = mktime64(year, src.month, src.day, src.hour, src.minute,
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src.second);
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dest->tv_sec -= offset * 60;
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/*
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* Sanitize nanosecond field since reportedly some filesystems are
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* recorded with bogus sub-second values.
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*/
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if (src.centiseconds < 100 && src.hundredsOfMicroseconds < 100 &&
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src.microseconds < 100) {
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dest->tv_nsec = 1000 * (src.centiseconds * 10000 +
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src.hundredsOfMicroseconds * 100 + src.microseconds);
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} else {
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dest->tv_nsec = 0;
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}
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}
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void
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udf_time_to_disk_stamp(struct timestamp *dest, struct timespec64 ts)
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{
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time64_t seconds;
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int16_t offset;
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struct tm tm;
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offset = -sys_tz.tz_minuteswest;
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dest->typeAndTimezone = cpu_to_le16(0x1000 | (offset & 0x0FFF));
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seconds = ts.tv_sec + offset * 60;
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time64_to_tm(seconds, 0, &tm);
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dest->year = cpu_to_le16(tm.tm_year + 1900);
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dest->month = tm.tm_mon + 1;
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dest->day = tm.tm_mday;
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dest->hour = tm.tm_hour;
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dest->minute = tm.tm_min;
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dest->second = tm.tm_sec;
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dest->centiseconds = ts.tv_nsec / 10000000;
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dest->hundredsOfMicroseconds = (ts.tv_nsec / 1000 -
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dest->centiseconds * 10000) / 100;
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dest->microseconds = (ts.tv_nsec / 1000 - dest->centiseconds * 10000 -
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dest->hundredsOfMicroseconds * 100);
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}
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/* EOF */
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