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xen/privcmd: Use memdup_array_user() in alloc_ioreq()

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* The function “memdup_array_user” was added with the
  commit 313ebe47d7 ("string.h: add
  array-wrappers for (v)memdup_user()").
  Thus use it accordingly.

  This issue was detected by using the Coccinelle software.

* Delete a label which became unnecessary with this refactoring.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/41e333f7-1f3a-41b6-a121-a3c0ae54e36f@web.de
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Markus Elfring 2024-01-28 17:50:43 +01:00 committed by Juergen Gross
parent 3693bb4465
commit b2c52b8c12
1 changed files with 5 additions and 10 deletions
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15
drivers/xen/privcmd.c
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@ -1223,18 +1223,13 @@ struct privcmd_kernel_ioreq *alloc_ioreq(struct privcmd_ioeventfd *ioeventfd)
kioreq->ioreq = (struct ioreq *)(page_to_virt(pages[0]));
mmap_write_unlock(mm);
size = sizeof(*ports) * kioreq->vcpus;
ports = kzalloc(size, GFP_KERNEL);
if (!ports) {
ret = -ENOMEM;
ports = memdup_array_user(u64_to_user_ptr(ioeventfd->ports),
kioreq->vcpus, sizeof(*ports));
if (IS_ERR(ports)) {
ret = PTR_ERR(ports);
goto error_kfree;
}
if (copy_from_user(ports, u64_to_user_ptr(ioeventfd->ports), size)) {
ret = -EFAULT;
goto error_kfree_ports;
}
for (i = 0; i < kioreq->vcpus; i++) {
kioreq->ports[i].vcpu = i;
kioreq->ports[i].port = ports[i];
@ -1256,7 +1251,7 @@ struct privcmd_kernel_ioreq *alloc_ioreq(struct privcmd_ioeventfd *ioeventfd)
error_unbind:
while (--i >= 0)
unbind_from_irqhandler(irq_from_evtchn(ports[i]), &kioreq->ports[i]);
error_kfree_ports:
kfree(ports);
error_kfree:
kfree(kioreq);