From fa7bdf4c84e162d43cb6ba5b43f89cc230ebcc30 Mon Sep 17 00:00:00 2001
From: Dirk Koopman <djk@tobit.co.uk>
Date: Fri, 20 Dec 2019 14:38:15 +0000
Subject: [PATCH] stop userfile decode/thaw crashes

---
 Changes        |  2 ++
 perl/DXUser.pm |  4 ++--
 perl/QSL.pm    | 10 +++++++++-
 3 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/Changes b/Changes
index dca614a7..14be428b 100644
--- a/Changes
+++ b/Changes
@@ -1,3 +1,5 @@
+21Sep19=======================================================================
+1. Harden userfile decode / thaw to stop crashes from corrupt records
 10Sep19=======================================================================
 1. Improve DXSql database filtering to exclude most via <locator> type 
    reports.
diff --git a/perl/DXUser.pm b/perl/DXUser.pm
index 25672f96..c611fac3 100644
--- a/perl/DXUser.pm
+++ b/perl/DXUser.pm
@@ -247,7 +247,7 @@ sub get
 	
 	# search for it
 	unless ($dbm->get($call, $data)) {
-		$ref = decode($data);
+		$ref = eval{decode($data)};
 		if ($ref) {
 			if (!UNIVERSAL::isa($ref, 'DXUser')) {
 				dbg("DXUser::get: got strange answer from decode of $call". ref $ref. " ignoring");
@@ -255,7 +255,7 @@ sub get
 			}
 			# we have a reference and it *is* a DXUser
 		} else {
-			dbg("DXUser::get: no reference returned from decode of $call $!");
+			dbg("DXUser::get: no reference returned from decode of $call $! $@");
 			return undef;
 		}
 		$lru->put($call, $ref);
diff --git a/perl/QSL.pm b/perl/QSL.pm
index 1031c953..d8a75c7f 100644
--- a/perl/QSL.pm
+++ b/perl/QSL.pm
@@ -115,9 +115,17 @@ sub get
 	
 	my $r = $dbm->get($key, $value);
 	return undef if $r;
-	return thaw($value);
+	my $v;
+	eval { $v = thaw($value) };
+	if ($@) {
+		LogDbg("Error thawing DXQSL key '$key' (now deleted): $@");
+		eval {$dbm->del($key)};
+		return undef;
+	}
+	return $v;
 }
 
+
 sub put
 {
 	return unless $dbm;
-- 
2.34.1