parser BUGFIX forbid empty patterns
Refs sysrepo/sysrepo#2572
diff --git a/src/parser_yin.c b/src/parser_yin.c
index 6ab6921..1dd2856 100644
--- a/src/parser_yin.c
+++ b/src/parser_yin.c
@@ -650,6 +650,13 @@
LY_CHECK_RET(yin_parse_attribute(ctx, YIN_ARG_VALUE, &real_value, Y_STR_ARG, LY_STMT_PATTERN));
size_t len = strlen(real_value);
+ /* empty pattern is not valid */
+ if (!len) {
+ LOGVAL_PARSER((struct lys_parser_ctx *)ctx, LY_VCODE_INVAL_YIN, real_value, "value", ly_stmt2str(LY_STMT_PATTERN));
+ lydict_remove(ctx->xmlctx->ctx, real_value);
+ return LY_EVALID;
+ }
+
saved_value = malloc(len + 2);
LY_CHECK_ERR_RET(!saved_value, LOGMEM(ctx->xmlctx->ctx), LY_EMEM);
memmove(saved_value + 1, real_value, len);