[PATCH] RTC class: error checks

The rtc_is_valid_tm() routine needs to treat some of the fields it checks as
unsigned, to prevent wrongly accepting invalid rtc_time structs; this is the
same approach used elsewhere in the RTC code for such tests.

Conversely, rtc_proc_show() is missing one invalid-day-of-month test that
rtc_is_valid_tm() makes: there is no day zero.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 5 insertions, 5 deletions

diff --git a/drivers/rtc/rtc-lib.c b/drivers/rtc/rtc-lib.c
index 9812120f3a7c..ba795a4db1e9 100644
--- a/drivers/rtc/rtc-lib.c
+++ b/drivers/rtc/rtc-lib.c
@@ -94,12 +94,12 @@ EXPORT_SYMBOL(rtc_time_to_tm);
 int rtc_valid_tm(struct rtc_time *tm)
 {
         if (tm->tm_year < 70
-                || tm->tm_mon >= 12
+                || ((unsigned)tm->tm_mon) >= 12
                 || tm->tm_mday < 1
                 || tm->tm_mday > rtc_month_days(tm->tm_mon, tm->tm_year + 1900)
-                || tm->tm_hour >= 24
-                || tm->tm_min >= 60
-                || tm->tm_sec >= 60)
+                || ((unsigned)tm->tm_hour) >= 24
+                || ((unsigned)tm->tm_min) >= 60
+                || ((unsigned)tm->tm_sec) >= 60)
                 return -EINVAL;
 
         return 0;
diff --git a/drivers/rtc/rtc-proc.c b/drivers/rtc/rtc-proc.c
index 1b2c2caa2a99..2943d83edfd1 100644
--- a/drivers/rtc/rtc-proc.c
+++ b/drivers/rtc/rtc-proc.c
@@ -61,7 +61,7 @@ static int rtc_proc_show(struct seq_file *seq, void *offset)
                         seq_printf(seq, "%02d-", alrm.time.tm_mon + 1);
                 else
                         seq_printf(seq, "**-");
-                if ((unsigned int)alrm.time.tm_mday <= 31)
+                if (alrm.time.tm_mday && (unsigned int)alrm.time.tm_mday <= 31)
                         seq_printf(seq, "%02d\n", alrm.time.tm_mday);
                 else
                         seq_printf(seq, "**\n");