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Fix subscript error with odd TZif file [BZ #28338]

Message ID 20210914054946.46372-1-eggert@cs.ucla.edu
State New
Headers show
Series Fix subscript error with odd TZif file [BZ #28338] | expand

Checks

Context Check Description
dj/TryBot-apply_patch success Patch applied to master at the time it was sent
dj/TryBot-32bit success Build for i686

Commit Message

Paul Eggert Sept. 14, 2021, 5:49 a.m. UTC
* time/tzfile.c (__tzfile_compute): Fix unlikely off-by-one bug
that accessed before start of an array when an oddball-but-valid
TZif file was queried with an unusual time_t value.
---
 time/tzfile.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
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Patch

diff --git a/time/tzfile.c b/time/tzfile.c
index 4377018a55..190a777152 100644
--- a/time/tzfile.c
+++ b/time/tzfile.c
@@ -765,8 +765,7 @@  __tzfile_compute (__time64_t timer, int use_localtime,
   *leap_correct = leaps[i].change;
 
   if (timer == leaps[i].transition /* Exactly at the transition time.  */
-      && ((i == 0 && leaps[i].change > 0)
-	  || leaps[i].change > leaps[i - 1].change))
+      && (leaps[i].change > (i == 0 ? 0 : leaps[i - 1].change)))
     {
       *leap_hit = 1;
       while (i > 0