apt-hook: verify that fd is numeric

since we read it from the environment

Co-authored-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
Reviewed-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
Tested-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>

diff --git a/debian/apthook/pve-apt-hook b/debian/apthook/pve-apt-hook
index 2053fefe27e3c6833095aed8b82e9f07cd00a6f4..8fa58c50ab478a4816f243d1320255e65842e84e 100755 (executable)
--- a/debian/apthook/pve-apt-hook
+++ b/debian/apthook/pve-apt-hook
@@ -15,7 +15,7 @@ my $log = sub {
   print "W: ($hook_name) $line";
 };
 
-if (!defined $fd || $fd == 0) {
+if (!defined $fd || $fd == 0 || $fd !~ /^\d+$/) {
   $log->("APT_HOOK_INFO_FD not correctly defined, skipping apt-pve-hook checks\n");
   exit 0;
 }