[PATCH 4/8] libsepol/cil: Push line mark state first when processing a line mark

[James Carter <jwcart2@gmail.com>]

CIL line mark rules are used to annotate the original line and file
of a rule. It is mostly used for neverallow rules that have been
converted to CIL.

Pushing the current line mark state after processing a line mark
section does not make sense since that information is never used.
When the line mark section ends the information is just popped and
discarded. It also makes pop_hll_info() more complicated than it
needs to be.

Push the line mark state first and simplfy pop_hll_info().

Signed-off-by: James Carter <jwcart2@gmail.com>
---
 libsepol/cil/src/cil_parser.c | 22 +++++++++-------------
 1 file changed, 9 insertions(+), 13 deletions(-)

diff --git a/libsepol/cil/src/cil_parser.c b/libsepol/cil/src/cil_parser.c
index 24386f60..d36ffc49 100644
--- a/libsepol/cil/src/cil_parser.c
+++ b/libsepol/cil/src/cil_parser.c
@@ -66,19 +66,15 @@ static void push_hll_info(struct cil_stack *stack, uint32_t hll_lineno, uint32_t
 static void pop_hll_info(struct cil_stack *stack, uint32_t *hll_lineno, uint32_t *hll_expand)
 {
 	struct cil_stack_item *curr = cil_stack_pop(stack);
-	struct cil_stack_item *prev = cil_stack_peek(stack);
-	struct hll_info *old;
+	struct hll_info *info;
 
-	free(curr->data);
-
-	if (!prev) {
-		*hll_lineno = 0;
-		*hll_expand = 0;
-	} else {
-		old = prev->data;
-		*hll_lineno = old->hll_lineno;
-		*hll_expand = old->hll_expand;
+	if (!curr) {
+		return;
 	}
+	info = curr->data;
+	*hll_expand = info->hll_expand;
+	*hll_lineno = info->hll_lineno;
+	free(curr->data);
 }
 
 static void create_node(struct cil_tree_node **node, struct cil_tree_node *current, uint32_t line, uint32_t hll_line, void *value)
@@ -128,6 +124,8 @@ static int add_hll_linemark(struct cil_tree_node **current, uint32_t *hll_lineno
 		pop_hll_info(stack, hll_lineno, hll_expand);
 		*current = (*current)->parent;
 	} else {
+		push_hll_info(stack, *hll_lineno, *hll_expand);
+
 		create_node(&node, *current, tok.line, *hll_lineno, NULL);
 		insert_node(node, *current);
 		*current = node;
@@ -158,8 +156,6 @@ static int add_hll_linemark(struct cil_tree_node **current, uint32_t *hll_lineno
 		*hll_lineno = val;
 		*hll_expand = (hll_type == CIL_KEY_HLL_LMX) ? 1 : 0;
 
-		push_hll_info(stack, *hll_lineno, *hll_expand);
-
 		cil_lexer_next(&tok);
 		if (tok.type != SYMBOL && tok.type != QSTRING) {
 			cil_log(CIL_ERR, "Invalid line mark syntax\n");
-- 
2.31.1