regexec.c: avoid overflow in computing sum of lengths

diff --git a/ChangeLog b/ChangeLog
index 31251f1..e6167fa 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2010-01-22  Jim Meyering  <jim@meyering.net>
 
+       [BZ #11191]
+       * posix/regexec.c (re_search_2_stub): Check for overflow
+       when adding the sizes of the two strings.
+
        [BZ #11190]
        * posix/regexec.c (re_search_internal): Avoid overflow
        in computing re_malloc buffer size.

diff --git a/posix/regexec.c b/posix/regexec.c
index 11f3d31..bad52ac 100644 (file)
--- a/posix/regexec.c
+++ b/posix/regexec.c
@@ -370,7 +370,7 @@ re_search_2_stub (bufp, string1, length1, string2, length2, start, range, regs,
   int len = length1 + length2;
   char *s = NULL;
 
-  if (BE (length1 < 0 || length2 < 0 || stop < 0, 0))
+  if (BE (length1 < 0 || length2 < 0 || stop < 0 || len < length1, 0))
     return -2;
 
   /* Concatenate the strings.  */