[PATCH 1/6] parse-datetime, posixtm: avoid uninit access

[Paul Eggert]

* lib/parse-datetime.y (parse_datetime2):
* lib/posixtm.c (posixtime):
Do not access uninitialized storage, even though the resulting
value is never used.
---
 ChangeLog            |  8 ++++++++
 lib/parse-datetime.y | 16 ++++++++++++++--
 lib/posixtm.c        |  7 ++++++-
 3 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 386986ee7..9c6d73f72 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2017-09-25  Paul Eggert  <egg...@cs.ucla.edu>
+
+       parse-datetime, posixtm: avoid uninit access
+       * lib/parse-datetime.y (parse_datetime2):
+       * lib/posixtm.c (posixtime):
+       Do not access uninitialized storage, even though the resulting
+       value is never used.
+
 2017-09-25  Bruno Haible  <br...@clisp.org>
 
        vma-iter: Improvements for BSD platforms.
diff --git a/lib/parse-datetime.y b/lib/parse-datetime.y
index 9eff2dc3b..f8da02d3f 100644
--- a/lib/parse-datetime.y
+++ b/lib/parse-datetime.y
@@ -2034,7 +2034,13 @@ parse_datetime2 (struct timespec *result, char const *p,
       if (pc.local_zones_seen)
         tm.tm_isdst = pc.local_isdst;
 
-      tm0 = tm;
+      tm0.tm_sec = tm.tm_sec;
+      tm0.tm_min = tm.tm_min;
+      tm0.tm_hour = tm.tm_hour;
+      tm0.tm_mday = tm.tm_mday;
+      tm0.tm_mon = tm.tm_mon;
+      tm0.tm_year = tm.tm_year;
+      tm0.tm_isdst = tm.tm_isdst;
 
       Start = mktime_z (tz, &tm);
 
@@ -2064,7 +2070,13 @@ parse_datetime2 (struct timespec *result, char const *p,
                     dbg_printf (_("error: tzalloc (\"%s\") failed\n"), tz2buf);
                   goto fail;
                 }
-              tm = tm0;
+              tm.tm_sec = tm0.tm_sec;
+              tm.tm_min = tm0.tm_min;
+              tm.tm_hour = tm0.tm_hour;
+              tm.tm_mday = tm0.tm_mday;
+              tm.tm_mon = tm0.tm_mon;
+              tm.tm_year = tm0.tm_year;
+              tm.tm_isdst = tm0.tm_isdst;
               Start = mktime_z (tz2, &tm);
               repaired = mktime_ok (tz2, &tm0, &tm, Start);
               tzfree (tz2);
diff --git a/lib/posixtm.c b/lib/posixtm.c
index 26a35dd3f..030f704f0 100644
--- a/lib/posixtm.c
+++ b/lib/posixtm.c
@@ -182,7 +182,12 @@ posixtime (time_t *p, const char *s, unsigned int 
syntax_bits)
   if (! posix_time_parse (&tm0, s, syntax_bits))
     return false;
 
-  tm1 = tm0;
+  tm1.tm_sec = tm0.tm_sec;
+  tm1.tm_min = tm0.tm_min;
+  tm1.tm_hour = tm0.tm_hour;
+  tm1.tm_mday = tm0.tm_mday;
+  tm1.tm_mon = tm0.tm_mon;
+  tm1.tm_year = tm0.tm_year;
   tm1.tm_isdst = -1;
   t = mktime (&tm1);
 
-- 
2.13.5