From: Jianglei Nie niejianglei2021@163.com
[ Upstream commit 271add11994ba1a334859069367e04d2be2ebdd4 ]
fc_exch_release(ep) will decrease the ep's reference count. When the reference count reaches zero, it is freed. But ep is still used in the following code, which will lead to a use after free.
Return after the fc_exch_release() call to avoid use after free.
Link: https://lore.kernel.org/r/20220303015115.459778-1-niejianglei2021@163.com Reviewed-by: Hannes Reinecke hare@suse.de Signed-off-by: Jianglei Nie niejianglei2021@163.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/scsi/libfc/fc_exch.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/scsi/libfc/fc_exch.c b/drivers/scsi/libfc/fc_exch.c index 841000445b9a..aa223db4cf53 100644 --- a/drivers/scsi/libfc/fc_exch.c +++ b/drivers/scsi/libfc/fc_exch.c @@ -1701,6 +1701,7 @@ static void fc_exch_abts_resp(struct fc_exch *ep, struct fc_frame *fp) if (cancel_delayed_work_sync(&ep->timeout_work)) { FC_EXCH_DBG(ep, "Exchange timer canceled due to ABTS response\n"); fc_exch_release(ep); /* release from pending timer hold */ + return; }
spin_lock_bh(&ep->ex_lock);