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authorMarkus Elfring <elfring@users.sourceforge.net>2016-08-24 20:45:23 +0300
committerChristian Borntraeger <borntraeger@de.ibm.com>2016-09-08 14:40:54 +0300
commita1708a2eaded836b7fe64e89a137336c0e6244ea (patch)
treedae558022be44c3585e4315d922ed6f9c3def0b0 /arch/s390
parenta6940674c384ebf56aa0c44f417032de2b67100c (diff)
downloadlinux-a1708a2eaded836b7fe64e89a137336c0e6244ea.tar.xz
KVM: s390: Improve determination of sizes in kvm_s390_import_bp_data()
* A multiplication for the size determination of a memory allocation indicated that an array data structure should be processed. Thus reuse the corresponding function "kmalloc_array". Suggested-by: Paolo Bonzini <pbonzini@redhat.com> This issue was detected also by using the Coccinelle software. * Replace the specification of data structures by pointer dereferences to make the corresponding size determination a bit safer according to the Linux coding style convention. * Delete the local variable "size" which became unnecessary with this refactoring. Signed-off-by: Markus Elfring <elfring@users.sourceforge.net> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Message-Id: <c3323f6b-4af2-0bfb-9399-e529952e378e@users.sourceforge.net> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/kvm/guestdbg.c25
1 files changed, 15 insertions, 10 deletions
diff --git a/arch/s390/kvm/guestdbg.c b/arch/s390/kvm/guestdbg.c
index d1f8241993a4..70b71ac1660e 100644
--- a/arch/s390/kvm/guestdbg.c
+++ b/arch/s390/kvm/guestdbg.c
@@ -206,7 +206,7 @@ static int __import_wp_info(struct kvm_vcpu *vcpu,
int kvm_s390_import_bp_data(struct kvm_vcpu *vcpu,
struct kvm_guest_debug *dbg)
{
- int ret = 0, nr_wp = 0, nr_bp = 0, i, size;
+ int ret = 0, nr_wp = 0, nr_bp = 0, i;
struct kvm_hw_breakpoint *bp_data = NULL;
struct kvm_hw_wp_info_arch *wp_info = NULL;
struct kvm_hw_bp_info_arch *bp_info = NULL;
@@ -216,14 +216,17 @@ int kvm_s390_import_bp_data(struct kvm_vcpu *vcpu,
else if (dbg->arch.nr_hw_bp > MAX_BP_COUNT)
return -EINVAL;
- size = dbg->arch.nr_hw_bp * sizeof(struct kvm_hw_breakpoint);
- bp_data = kmalloc(size, GFP_KERNEL);
+ 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, size)) {
+ if (copy_from_user(bp_data,
+ dbg->arch.hw_bp,
+ sizeof(*bp_data) * dbg->arch.nr_hw_bp)) {
ret = -EFAULT;
goto error;
}
@@ -241,17 +244,19 @@ int kvm_s390_import_bp_data(struct kvm_vcpu *vcpu,
}
}
- size = nr_wp * sizeof(struct kvm_hw_wp_info_arch);
- if (size > 0) {
- wp_info = kmalloc(size, GFP_KERNEL);
+ if (nr_wp > 0) {
+ wp_info = kmalloc_array(nr_wp,
+ sizeof(*wp_info),
+ GFP_KERNEL);
if (!wp_info) {
ret = -ENOMEM;
goto error;
}
}
- size = nr_bp * sizeof(struct kvm_hw_bp_info_arch);
- if (size > 0) {
- bp_info = kmalloc(size, GFP_KERNEL);
+ if (nr_bp > 0) {
+ bp_info = kmalloc_array(nr_bp,
+ sizeof(*bp_info),
+ GFP_KERNEL);
if (!bp_info) {
ret = -ENOMEM;
goto error;