[pve-devel] [PATCH container] Fix invalid device passthrough being added to config

[Filip Schauer]

Fix a bug that allows a device passthrough entry to be added to the
config despite the device path not pointing to a device. Previously,
adding an invalid device passthrough entry would throw an error, but the
entry would still be added to the config. This is fixed by moving the
respective checks from update_lxc_config to update_pct_config, which is
run before the entry is written to the config file.

Signed-off-by: Filip Schauer <f.schauer at proxmox.com>
---
 src/PVE/LXC.pm        |  8 --------
 src/PVE/LXC/Config.pm | 19 ++++++++++++++++++-
 2 files changed, 18 insertions(+), 9 deletions(-)

diff --git a/src/PVE/LXC.pm b/src/PVE/LXC.pm
index 7883cfb..f0c000b 100644
--- a/src/PVE/LXC.pm
+++ b/src/PVE/LXC.pm
@@ -643,20 +643,12 @@ sub update_lxc_config {
     PVE::LXC::Config->foreach_passthrough_device($conf, sub {
 	my ($key, $device) = @_;
 
-	die "Path is not defined for passthrough device $key"
-	    unless (defined($device->{path}));
-
 	my $absolute_path = $device->{path};
 	my ($mode, $rdev) = (stat($absolute_path))[2, 6];
 
-	die "Device $absolute_path does not exist\n" if $! == ENOENT;
-
 	die "Error accessing device $absolute_path\n"
 	    if (!defined($mode) || !defined($rdev));
 
-	die "$absolute_path is not a device\n"
-	    if (!S_ISBLK($mode) && !S_ISCHR($mode));
-
 	my $major = PVE::Tools::dev_t_major($rdev);
 	my $minor = PVE::Tools::dev_t_minor($rdev);
 	my $device_type_char = S_ISBLK($mode) ? 'b' : 'c';
diff --git a/src/PVE/LXC/Config.pm b/src/PVE/LXC/Config.pm
index 5ac1446..4ea103e 100644
--- a/src/PVE/LXC/Config.pm
+++ b/src/PVE/LXC/Config.pm
@@ -3,7 +3,8 @@ package PVE::LXC::Config;
 use strict;
 use warnings;
 
-use Fcntl qw(O_RDONLY);
+use Errno qw(ENOENT);
+use Fcntl qw(O_RDONLY :mode);
 
 use PVE::AbstractConfig;
 use PVE::Cluster qw(cfs_register_file);
@@ -1193,6 +1194,22 @@ sub update_pct_config {
 		die "$opt: MTU size '$mtu' is bigger than bridge MTU '$bridge_mtu'\n"
 		    if ($mtu > $bridge_mtu);
 	    }
+	} elsif ($opt =~ m/^dev(\d+)$/) {
+	    my $device = $class->parse_device($value);
+
+	    die "Path is not defined for passthrough device $opt"
+		unless (defined($device->{path}));
+
+	    my $absolute_path = $device->{path};
+	    my ($mode, $rdev) = (stat($absolute_path))[2, 6];
+
+	    die "Device $absolute_path does not exist\n" if $! == ENOENT;
+
+	    die "Error accessing device $absolute_path\n"
+		if (!defined($mode) || !defined($rdev));
+
+	    die "$absolute_path is not a device\n"
+		if (!S_ISBLK($mode) && !S_ISCHR($mode));
 	}
 	$conf->{pending}->{$opt} = $value;
 	$class->remove_from_pending_delete($conf, $opt);
-- 
2.39.2