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KVM: s390: Use memdup_user() rather than duplicating code 

* 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>
This commit is contained in:
Markus Elfring 2016-08-24 20:10:09 +02:00 committed by Christian Borntraeger
parent a1708a2ead
commit 0624a8eb82
1 changed files with 4 additions and 14 deletions
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18
arch/s390/kvm/guestdbg.c
View File

@ -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) {