From: Serge Tupchii <serge.tupchii@protonmail.com>
Date: Tue, 8 Dec 2020 20:22:34 +0000 (+0100)
Subject: Fix crash (segfault) in etags on generating tags for Erlang files
X-Git-Tag: emacs-27.1.90~12
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=809b22d18d;p=emacs.git

Fix crash (segfault) in etags on generating tags for Erlang files

* lib-src/etags.c: Set allocated and lastlen to zero, after
freeing last ptr in Erlang_functions to prevent dereferencing NULL
pointer (bug#45122).

Copyright-paperwork-exempt: yes

(cherry picked from commit 2d8f0364fcd1d5dad2b82dd3a9af870b03854547)
---

diff --git a/lib-src/etags.c b/lib-src/etags.c
index f761a7b7c33..502f90920d2 100644
--- a/lib-src/etags.c
+++ b/lib-src/etags.c
@@ -6062,6 +6062,7 @@ Erlang_functions (FILE *inf)
 	    {
 	      free (last);
 	      last = NULL;
+	      allocated = lastlen = 0;
 	    }
 	}
       else