sym53c8xx: Fix NULL pointer dereference in slave_destroy

[firefly-linux-kernel-4.4.55.git] / drivers / scsi / sym53c8xx_2 / sym_glue.c

diff --git a/drivers/scsi/sym53c8xx_2/sym_glue.c b/drivers/scsi/sym53c8xx_2/sym_glue.c
index b4543f575f466fc3c7fed5f3edad05be9595d0cd..36d1ed7817ebf9d52631c970023d31b31ff494e0 100644 (file)
--- a/drivers/scsi/sym53c8xx_2/sym_glue.c
+++ b/drivers/scsi/sym53c8xx_2/sym_glue.c
@@ -839,6 +839,10 @@ static void sym53c8xx_slave_destroy(struct scsi_device *sdev)
        struct sym_lcb *lp = sym_lp(tp, sdev->lun);
        unsigned long flags;
 
+       /* if slave_alloc returned before allocating a sym_lcb, return */
+       if (!lp)
+               return;
+
        spin_lock_irqsave(np->s.host->host_lock, flags);
 
        if (lp->busy_itlq || lp->busy_itl) {