2012-02-26  Paul Smith  <psmith@gnu.org>

	* implicit.c (pattern_search): Check the stem length to avoid
	stack overflows in stem_str.  Fixes Savannah bug #35525.

--- a/implicit.c
+++ b/implicit.c
@@ -488,6 +488,13 @@ pattern_search (struct file *file, int archive,
               dir = pathdir;
             }
 
+          if (stemlen > GET_PATH_MAX)
+            {
+              DBS (DB_IMPLICIT, (_("Stem too long: `%.*s'.\n"),
+                                 (int) stemlen, stem));
+              continue;
+            }
+
           DBS (DB_IMPLICIT, (_("Trying pattern rule with stem `%.*s'.\n"),
                              (int) stemlen, stem));