[CVE-2009-5155] Diagnose ERE '()|\1'

Problem reported by Hanno Böck in: http://bugs.gnu.org/21513
* lib/regcomp.c (parse_reg_exp): While parsing alternatives, keep
track of the set of previously-completed subexpressions available
before the first alternative, and restore this set just before
parsing each subsequent alternative.  This lets us diagnose the
invalid back-reference in the ERE '()|\1'.

Change-Id: I18a2ec367b04a69d8429e92a1b4784b6d7692832
Signed-off-by: JinWang An <jinwang.an@samsung.com>

diff --git a/lib/regcomp.c b/lib/regcomp.c
index fe4d243d54f7da219569584dc5f03476ba59954c..022abb520dfe96311f12be3fd807988e29cd77a0 100644 (file)
--- a/lib/regcomp.c
+++ b/lib/regcomp.c
@@ -2116,6 +2116,7 @@ parse_reg_exp (re_string_t *regexp, regex_t *preg, re_token_t *token,
 {
   re_dfa_t *dfa = (re_dfa_t *) preg->buffer;
   bin_tree_t *tree, *branch = NULL;
+  bitset_word_t initial_bkref_map = dfa->completed_bkref_map;
   tree = parse_branch (regexp, preg, token, syntax, nest, err);
   if (BE (*err != REG_NOERROR && tree == NULL, 0))
     return NULL;
@@ -2126,9 +2127,16 @@ parse_reg_exp (re_string_t *regexp, regex_t *preg, re_token_t *token,
       if (token->type != OP_ALT && token->type != END_OF_RE
          && (nest == 0 || token->type != OP_CLOSE_SUBEXP))
        {
+         bitset_word_t accumulated_bkref_map = dfa->completed_bkref_map;
+         dfa->completed_bkref_map = initial_bkref_map;
          branch = parse_branch (regexp, preg, token, syntax, nest, err);
          if (BE (*err != REG_NOERROR && branch == NULL, 0))
-           return NULL;
+           {
+             if (tree != NULL)
+                    postorder (tree, free_tree, NULL);
+             return NULL;
+           }
+         dfa->completed_bkref_map |= accumulated_bkref_map;
        }
       else
        branch = NULL;