PR23939, Check frch_cfi_data before use

	PR 23939
	* dw2gencfi.c (dot_cfi_label): Check frch_cfi_data is non-NULL
	before use.

diff --git a/gas/ChangeLog b/gas/ChangeLog
index ba4aa15..dbb8a37 100644 (file)
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,9 @@
+2018-12-04  wu.heng  <wu.heng@zte.com.cn>
+
+       PR 23939
+       * dw2gencfi.c (dot_cfi_label): Check frch_cfi_data is non-NULL
+       before use.
+
 2018-12-03  Kito Cheng  <kito@andestech.com>
 
        * config/tc-riscv.c: Include elfxx-riscv.h.

diff --git a/gas/dw2gencfi.c b/gas/dw2gencfi.c
index 3b61070..4add173 100644 (file)
--- a/gas/dw2gencfi.c
+++ b/gas/dw2gencfi.c
@@ -1198,8 +1198,16 @@ dot_cfi_val_encoded_addr (int ignored ATTRIBUTE_UNUSED)
 static void
 dot_cfi_label (int ignored ATTRIBUTE_UNUSED)
 {
-  char *name = read_symbol_name ();
+  char *name;
+
+  if (frchain_now->frch_cfi_data == NULL)
+    {
+      as_bad (_("CFI instruction used without previous .cfi_startproc"));
+      ignore_rest_of_line ();
+      return;
+    }
 
+  name = read_symbol_name ();
   if (name == NULL)
     return;