From cced5041ed5a2d1352186510944b0ddfbdbe4c0b Mon Sep 17 00:00:00 2001 From: Stratos Psomadakis Date: Sun, 4 Dec 2011 02:23:54 +0200 Subject: [PATCH] [SCSI] sym53c8xx: Fix NULL pointer dereference in slave_destroy sym53c8xx_slave_destroy unconditionally assumes that sym53c8xx_slave_alloc has succesesfully allocated a sym_lcb. This can lead to a NULL pointer dereference (exposed by commit 4e6c82b). Signed-off-by: Stratos Psomadakis Cc: stable@vger.kernel.org Signed-off-by: James Bottomley --- drivers/scsi/sym53c8xx_2/sym_glue.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/scsi/sym53c8xx_2/sym_glue.c b/drivers/scsi/sym53c8xx_2/sym_glue.c index b4543f575f46..36d1ed7817eb 100644 --- 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) {