From: Andrey Smirnov <andrew.smirnov@gmail.com>
To: barebox@lists.infradead.org
Cc: Andrey Smirnov <andrew.smirnov@gmail.com>
Subject: [PATCH 3/6] rtc-lib: Check tm_wday for validity in rtc_valid_tm()
Date: Wed, 6 Jan 2016 22:17:32 -0800 [thread overview]
Message-ID: <1452147455-26524-3-git-send-email-andrew.smirnov@gmail.com> (raw)
In-Reply-To: <1452147455-26524-1-git-send-email-andrew.smirnov@gmail.com>
RTC drivers rely on rtc_valid_tm() in order to make sure that no bogus
values from uninitialized HW registers get passed to the uppper layers.
A somewhat contrived way to reproduce this problem with DS1307 RTC
would be to do the following:
> rtc_write -b <bus> -a <addr> -r 3 0x00
> hwclock
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
drivers/rtc/rtc-lib.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/rtc/rtc-lib.c b/drivers/rtc/rtc-lib.c
index 1b23458..83d8045 100644
--- a/drivers/rtc/rtc-lib.c
+++ b/drivers/rtc/rtc-lib.c
@@ -90,6 +90,8 @@ int rtc_valid_tm(struct rtc_time *tm)
{
if (tm->tm_year < 70
|| ((unsigned)tm->tm_mon) >= 12
+ || tm->tm_wday < 0
+ || tm->tm_wday > 6
|| tm->tm_mday < 1
|| tm->tm_mday > rtc_month_days(tm->tm_mon, tm->tm_year + 1900)
|| ((unsigned)tm->tm_hour) >= 24
--
2.5.0
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next prev parent reply other threads:[~2016-01-07 6:19 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-07 6:17 [PATCH 1/6] rtc: ds1307: Add code to support ds1337/1341 Andrey Smirnov
2016-01-07 6:17 ` [PATCH 2/6] rtc: ds1307: Fix a memory leak Andrey Smirnov
2016-01-07 6:17 ` Andrey Smirnov [this message]
2016-01-07 6:57 ` [PATCH 3/6] rtc-lib: Check tm_wday for validity in rtc_valid_tm() Antony Pavlov
2016-01-07 16:54 ` Andrey Smirnov
2016-01-07 6:17 ` [PATCH 5/6] common/date.c: Fix off-by-one error Andrey Smirnov
2016-01-07 7:50 ` Sascha Hauer
2016-01-07 6:17 ` [PATCH 6/6] commands/hwclock: Check return value of rtc_read_time() Andrey Smirnov
2016-01-07 6:58 ` Antony Pavlov
2016-01-07 6:51 ` [PATCH 1/6] rtc: ds1307: Add code to support ds1337/1341 Antony Pavlov
2016-01-07 7:48 ` Sascha Hauer
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