linux-kernel - [PATCH v2 2/2] KVM: s390: Use memdup_user() rather than duplicating code

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <c86f7520-885e-2829-ae9c-b81caa898e84@users.sourceforge.net>
Date:   Wed, 24 Aug 2016 20:40:03 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     kvm@...r.kernel.org, linux-s390@...r.kernel.org,
        Christian Bornträger <borntraeger@...ibm.com>,
        Cornelia Huck <cornelia.huck@...ibm.com>,
        David Hildenbrand <dahi@...ux.vnet.ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Julia Lawall <julia.lawall@...6.fr>,
        Walter Harms <wharms@....de>
Subject: [PATCH v2 2/2] KVM: s390: Use memdup_user() rather than duplicating
 code

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Wed, 24 Aug 2016 20:10:09 +0200

* 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@...ux.vnet.ibm.com>
Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---

v2: Rebased on source files from "Linux next-20160824".

 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) {
-- 
2.9.3