Add check for null pointers in yr_lex_parse_rules_bytes and yr_lex_pa…

…rse_rules_string Closes #2139
VirusTotal · Feb 27, 2025 · 93d1de6 · 93d1de6
1 parent 53642c3
commit 93d1de6
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Showing 2 changed files with 12 additions and 0 deletions.
diff --git a/libyara/lexer.c b/libyara/lexer.c
@@ -3549,6 +3549,9 @@ int yr_lex_parse_rules_bytes(
 
   compiler->errors = 0;
 
+  if (rules_data == NULL)
+    return 0;
+
   if (yylex_init(&yyscanner) != 0)
   {
     compiler->errors = 1;
@@ -3581,6 +3584,9 @@ int yr_lex_parse_rules_string(
 
   compiler->errors = 0;
 
+  if (rules_string == NULL)
+    return 0;
+
   if (yylex_init(&yyscanner) != 0)
   {
     compiler->errors = 1;

diff --git a/libyara/lexer.l b/libyara/lexer.l
@@ -895,6 +895,9 @@ int yr_lex_parse_rules_bytes(
 
   compiler->errors = 0;
 
+  if (rules_data == NULL)
+    return 0;
+
   if (yylex_init(&yyscanner) != 0)
   {
     compiler->errors = 1;
@@ -927,6 +930,9 @@ int yr_lex_parse_rules_string(
 
   compiler->errors = 0;
 
+  if (rules_string == NULL)
+    return 0;
+
   if (yylex_init(&yyscanner) != 0)
   {
     compiler->errors = 1;