https://git.ruby-lang.org/ruby.git/commit/?id=d795f494a8

From d795f494a89e0d9498dfedc54b8a98acc2bc4d7b Mon Sep 17 00:00:00 2001
From: xtkoba <69125751+xtkoba@u...>
Date: Thu, 29 Apr 2021 23:53:55 +0900
Subject: Avoid `free(3)`ing invalid pointer

Fixes [Bug #17794]
---
 addr2line.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/addr2line.c b/addr2line.c
index cf0a379..8ee4416 100644
--- a/addr2line.c
+++ b/addr2line.c
@@ -1699,6 +1699,7 @@ debug_info_read(DebugInfoReader *reader, int num_traces, void **traces, https://github.com/ruby/ruby/blob/trunk/addr2line.c#L1699
 static unsigned long
 uncompress_debug_section(ElfW(Shdr) *shdr, char *file, char **ptr)
 {
+    *ptr = NULL;
 #ifdef SUPPORT_COMPRESSED_DEBUG_LINE
     ElfW(Chdr) *chdr = (ElfW(Chdr) *)(file + shdr->sh_offset);
     unsigned long destsize = chdr->ch_size;
@@ -1719,6 +1720,7 @@ uncompress_debug_section(ElfW(Shdr) *shdr, char *file, char **ptr) https://github.com/ruby/ruby/blob/trunk/addr2line.c#L1720
 
 fail:
     free(*ptr);
+    *ptr = NULL;
 #endif
     return 0;
 }
-- 
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