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-rw-r--r--time/tzfile.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/time/tzfile.c b/time/tzfile.c
index 1bce14c3f0..2a1a953962 100644
--- a/time/tzfile.c
+++ b/time/tzfile.c
@@ -230,6 +230,8 @@ __tzfile_read (const char *file)
 	  || fread_unlocked (&types[i].isdst, 1, 1, f) != 1
 	  || fread_unlocked (&types[i].idx, 1, 1, f) != 1)
 	goto lose;
+      if (types[i].isdst > 1)
+	goto lose;
       if (types[i].idx >= chars) /* Bogus index in data file.  */
 	goto lose;
       types[i].offset = (long int) decode (x);