From: Corey Farrell <git@cfware.com>
Date: Fri, 13 Oct 2017 13:51:09 +0000 (-0400)
Subject: ast_bt_get_symbols: Prevent double-free.
X-Git-Tag: 13.19.0-rc1~208^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=89f11364f674c67454e12a91464eda74932fe86a;p=thirdparty%2Fasterisk.git

ast_bt_get_symbols: Prevent double-free.

It's possible for bfdobj to be created but syms not created.  If syms
was not allocated in the current loop iteration but was allocated in the
previous iteration it would crash.

ASTERISK-27340

Change-Id: I5b110c609f6dfe91339f782a99a431bca5837363
---

diff --git a/main/backtrace.c b/main/backtrace.c
index a1156467f7..1659890548 100644
--- a/main/backtrace.c
+++ b/main/backtrace.c
@@ -173,6 +173,7 @@ char **__ast_bt_get_symbols(void **addresses, size_t num_frames)
 		if (bfdobj) {
 			bfd_close(bfdobj);
 			ast_std_free(syms);
+			syms = NULL;
 		}
 
 		/* Default output, if we cannot find the information within BFD */