commit 2261dfa66ebe1a9eb7091d6abb79ab064d79fe4c
author Michal Vasko <mvasko@cesnet.cz> Thu Sep 29 12:29:20 2022 +0200
committer Michal Vasko <mvasko@cesnet.cz> Thu Sep 29 12:29:20 2022 +0200
tree 44062cba69c561c4b20a8f7915edcac8b377116c
parent 0ff191d41270235b4689eb9590fe7d7b3ca31b00

path UPDATE forbid positional predicate 0

Refs #1920

src/path.c

diff --git a/src/path.c b/src/path.c
index b6dc04a..9757699 100644
--- a/src/path.c
+++ b/src/path.c
@@ -130,6 +130,13 @@
         } else if ((pred == LY_PATH_PRED_SIMPLE) && !lyxp_next_token(NULL, exp, tok_idx, LYXP_TOKEN_NUMBER)) {
             /* Number */
 
+            /* check for index 0 */
+            if (!atoi(exp->expr + exp->tok_pos[*tok_idx - 1])) {
+                LOGVAL(ctx, LYVE_XPATH, "Invalid positional predicate \"%.*s\".", (int)exp->tok_len[*tok_idx - 1],
+                        exp->expr + exp->tok_pos[*tok_idx - 1]);
+                goto token_error;
+            }
+
             /* ']' */
             LY_CHECK_GOTO(lyxp_next_token(ctx, exp, tok_idx, LYXP_TOKEN_BRACK2), token_error);