From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:1192 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729283AbfGHULF (ORCPT ); Mon, 8 Jul 2019 16:11:05 -0400 From: Farhan Ali Subject: [RFC v2 2/5] vfio-ccw: Fix memory leak and don't call cp_free in cp_init Date: Mon, 8 Jul 2019 16:10:35 -0400 Message-Id: In-Reply-To: References: In-Reply-To: References: Sender: linux-s390-owner@vger.kernel.org List-ID: To: cohuck@redhat.com, farman@linux.ibm.com, pasic@linux.ibm.com Cc: linux-s390@vger.kernel.org, kvm@vger.kernel.org, alifm@linux.ibm.com We don't set cp->initialized to true so calling cp_free will just return and not do anything. Also fix a memory leak where we fail to free a ccwchain on an error. Fixes: 812271b910 ("s390/cio: Squash cp_free() and cp_unpin_free()") Signed-off-by: Farhan Ali --- drivers/s390/cio/vfio_ccw_cp.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/drivers/s390/cio/vfio_ccw_cp.c b/drivers/s390/cio/vfio_ccw_cp.c index 7622b72..31a04a5 100644 --- a/drivers/s390/cio/vfio_ccw_cp.c +++ b/drivers/s390/cio/vfio_ccw_cp.c @@ -421,7 +421,7 @@ static int ccwchain_loop_tic(struct ccwchain *chain, static int ccwchain_handle_ccw(u32 cda, struct channel_program *cp) { struct ccwchain *chain; - int len; + int len, ret; /* Copy 2K (the most we support today) of possible CCWs */ len = copy_from_iova(cp->mdev, cp->guest_cp, cda, @@ -448,7 +448,12 @@ static int ccwchain_handle_ccw(u32 cda, struct channel_program *cp) memcpy(chain->ch_ccw, cp->guest_cp, len * sizeof(struct ccw1)); /* Loop for tics on this new chain. */ - return ccwchain_loop_tic(chain, cp); + ret = ccwchain_loop_tic(chain, cp); + + if (ret) + ccwchain_free(chain); + + return ret; } /* Loop for TICs. */ @@ -642,8 +647,6 @@ int cp_init(struct channel_program *cp, struct device *mdev, union orb *orb) /* Build a ccwchain for the first CCW segment */ ret = ccwchain_handle_ccw(orb->cmd.cpa, cp); - if (ret) - cp_free(cp); /* It is safe to force: if it was not set but idals used * ccwchain_calc_length would have returned an error. -- 2.7.4