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Subject[PATCH v2 2/2] KVM: s390: Use memdup_user() rather than duplicating code
From
Date
From: Markus Elfring <elfring@users.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@linux.vnet.ibm.com>
Signed-off-by: Markus Elfring <elfring@users.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
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