[PATCH 1/2] RISC-V: Fix use-after free bug

[Palmer Dabbelt]

From: Andrew Waterman <andrew@sifive.com>

bfd/ChangeLog

2017-07-25  Andrew Waterman  <andrew@sifive.com>

	* config/tc-riscv.c (riscv_set_arch): Obviate use-after-free.
---
 gas/config/tc-riscv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gas/config/tc-riscv.c b/gas/config/tc-riscv.c
index 9843675ee3..8bf0db5e78 100644
--- a/gas/config/tc-riscv.c
+++ b/gas/config/tc-riscv.c
@@ -200,7 +200,6 @@ riscv_set_arch (const char *s)
 	  extension = subset;
 	  riscv_add_subset (subset);
 	  p += strlen (subset);
-	  free (subset);
 	}
       else if (*p == '_')
 	p++;
@@ -220,6 +219,8 @@ riscv_set_arch (const char *s)
       else
 	as_fatal ("-march=%s: unsupported ISA subset `%c'", s, *p);
     }
+
+  free (extension);
 }
 
 /* Handle of the OPCODE hash table.  */
-- 
2.13.0