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From: Christian Borntraeger <borntraeger@de.ibm.com>
To: "Paolo Bonzini" <pbonzini@redhat.com>,
	"Radim Krčmář" <rkrcmar@redhat.com>
Cc: KVM <kvm@vger.kernel.org>,
	Cornelia Huck <cornelia.huck@de.ibm.com>,
	linux-s390 <linux-s390@vger.kernel.org>,
	Christian Borntraeger <borntraeger@de.ibm.com>,
	Markus Elfring <elfring@users.sourceforge.net>
Subject: [GIT PULL 11/11] KVM: s390: Use memdup_user() rather than duplicating code
Date: Thu,  8 Sep 2016 14:00:23 +0200	[thread overview]
Message-ID: <1473336023-15522-12-git-send-email-borntraeger@de.ibm.com> (raw)
In-Reply-To: <1473336023-15522-1-git-send-email-borntraeger@de.ibm.com>

From: Markus Elfring <elfring@users.sourceforge.net>

* Reuse existing functionality from memdup_user() instead of keeping
  duplicate source code.

  This issue was detected by using the Coccinelle software.

* Return directly if this copy operation failed.

Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Message-Id: <c86f7520-885e-2829-ae9c-b81caa898e84@users.sourceforge.net>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
---
 arch/s390/kvm/guestdbg.c | 18 ++++--------------
 1 file changed, 4 insertions(+), 14 deletions(-)

diff --git a/arch/s390/kvm/guestdbg.c b/arch/s390/kvm/guestdbg.c
index 70b71ac..d7c6a7f 100644
--- a/arch/s390/kvm/guestdbg.c
+++ b/arch/s390/kvm/guestdbg.c
@@ -216,20 +216,10 @@ int kvm_s390_import_bp_data(struct kvm_vcpu *vcpu,
 	else if (dbg->arch.nr_hw_bp > MAX_BP_COUNT)
 		return -EINVAL;
 
-	bp_data = kmalloc_array(dbg->arch.nr_hw_bp,
-				sizeof(*bp_data),
-				GFP_KERNEL);
-	if (!bp_data) {
-		ret = -ENOMEM;
-		goto error;
-	}
-
-	if (copy_from_user(bp_data,
-			   dbg->arch.hw_bp,
-			   sizeof(*bp_data) * dbg->arch.nr_hw_bp)) {
-		ret = -EFAULT;
-		goto error;
-	}
+	bp_data = memdup_user(dbg->arch.hw_bp,
+			      sizeof(*bp_data) * dbg->arch.nr_hw_bp);
+	if (IS_ERR(bp_data))
+		return PTR_ERR(bp_data);
 
 	for (i = 0; i < dbg->arch.nr_hw_bp; i++) {
 		switch (bp_data[i].type) {
-- 
2.5.5

  parent reply	other threads:[~2016-09-08 12:00 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-09-08 12:00 [GIT PULL 00/11] KVM: s390: features and fixes for 4.9 (via kvm/next) Christian Borntraeger
2016-09-08 12:00 ` [GIT PULL 01/11] KVM: s390: generate facility mask from readable list Christian Borntraeger
2016-09-08 12:00 ` [GIT PULL 02/11] KVM: s390: factor out actual delivery of machine checks Christian Borntraeger
2016-09-08 12:00 ` [GIT PULL 03/11] KVM: s390: split store status and machine check handling Christian Borntraeger
2016-09-08 12:00 ` [GIT PULL 04/11] KVM: s390: fix delivery of vector regs during machine checks Christian Borntraeger
2016-09-08 12:00 ` [GIT PULL 05/11] KVM: s390: write external damage code on " Christian Borntraeger
2016-09-08 12:00 ` [GIT PULL 06/11] KVM: s390: guestdbg: separate defines for per code Christian Borntraeger
2016-09-08 12:00 ` [GIT PULL 07/11] KVM: s390: gaccess: simplify translation exception handling Christian Borntraeger
2016-09-08 12:00 ` [GIT PULL 08/11] KVM: s390: lazy enable RI Christian Borntraeger
2016-09-08 12:00 ` [GIT PULL 09/11] KVM: s390: allow 255 VCPUs when sca entries aren't used Christian Borntraeger
2016-09-08 12:00 ` [GIT PULL 10/11] KVM: s390: Improve determination of sizes in kvm_s390_import_bp_data() Christian Borntraeger
2016-09-08 12:00 ` Christian Borntraeger [this message]
2016-09-08 13:36 ` [GIT PULL 00/11] KVM: s390: features and fixes for 4.9 (via kvm/next) Paolo Bonzini

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