commit ac47b6b038c013c2084ef1d8d3d40841034b257c
parent d046f2956ae71450e1d6cfd734c1245d1a8186b8
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date: Wed, 26 Oct 2022 16:32:31 +0200
cc1: Avoid out of border access in cppelse()
Diffstat:
1 file changed, 5 insertions(+), 0 deletions(-)
diff --git a/src/cmd/cc/cc1/cpp.c b/src/cmd/cc/cc1/cpp.c
@@ -834,6 +834,11 @@ cppelse(void)
static void
elif(void)
{
+ if (cppctx == 0) {
+ cpperror("#elif without #ifdef/ifndef");
+ return;
+ }
+
elseclause();
if (ifstatus[cppctx-1]) {
--cppctx;