AcoSail/kernel_optimize_test
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VMCI: Use memdup_user() rather than duplicating its implementation

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Reuse existing functionality from memdup_user() instead of keeping
duplicate source code.

This issue was detected by using the Coccinelle software.

Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
CC: Arnd Bergmann <arnd@arndb.de>
CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
CC: linux-kernel@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wen Yang 2018-12-10 19:36:07 +08:00 committed by Greg Kroah-Hartman
parent f88fd66605
commit 8995fa1e1c
1 changed files with 4 additions and 14 deletions
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18
drivers/misc/vmw_vmci/vmci_host.c
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@ -750,19 +750,10 @@ static int vmci_host_do_ctx_set_cpt_state(struct vmci_host_dev *vmci_host_dev,
if (copy_from_user(&set_info, uptr, sizeof(set_info)))
return -EFAULT;
cpt_buf = kmalloc(set_info.buf_size, GFP_KERNEL);
if (!cpt_buf) {
vmci_ioctl_err(
"cannot allocate memory to set cpt state (type=%d)\n",
set_info.cpt_type);
return -ENOMEM;
}
if (copy_from_user(cpt_buf, (void __user *)(uintptr_t)set_info.cpt_buf,
set_info.buf_size)) {
retval = -EFAULT;
goto out;
}
cpt_buf = memdup_user((void __user *)(uintptr_t)set_info.cpt_buf,
set_info.buf_size);
if (IS_ERR(cpt_buf))
return PTR_ERR(cpt_buf);
cid = vmci_ctx_get_id(vmci_host_dev->context);
set_info.result = vmci_ctx_set_chkpt_state(cid, set_info.cpt_type,
@ -770,7 +761,6 @@ static int vmci_host_do_ctx_set_cpt_state(struct vmci_host_dev *vmci_host_dev,
retval = copy_to_user(uptr, &set_info, sizeof(set_info)) ? -EFAULT : 0;
out:
kfree(cpt_buf);
return retval;
}