firewire: fw-sbp2: fix NULL pointer deref. in slave_alloc

Fix a kernel bug when running rescan-scsi-bus while a FireWire disk is connected: http://bugzilla.kernel.org/show_bug.cgi?id=10008 Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
git-mirror · Feb 19, 2008 · 5513c5f · 5513c5f
1 parent 2e2705b
commit 5513c5f
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c
@@ -1473,6 +1473,10 @@ static int sbp2_scsi_slave_alloc(struct scsi_device *sdev)
 {
 	struct sbp2_logical_unit *lu = sdev->hostdata;
 
+	/* (Re-)Adding logical units via the SCSI stack is not supported. */
+	if (!lu)
+		return -ENOSYS;
+
 	sdev->allow_restart = 1;
 
 	/*