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Subject[PATCH v2] VMCI: Use memdup_user() as a cleanup
Date
Fix coccicheck warning which recommends to use memdup_user()
and relative cleanup
drivers/misc/vmw_vmci/vmci_host.c:757:11-18: WARNING opportunity for memdup_user
Generated by: scripts/coccinelle/memdup_user/memdup_user.cocci

Signed-off-by: Vasyl Gomonovych <gomonovych@gmail.com>
---
drivers/misc/vmw_vmci/vmci_host.c | 25 ++++++++-----------------
1 file changed, 8 insertions(+), 17 deletions(-)

diff --git a/drivers/misc/vmw_vmci/vmci_host.c b/drivers/misc/vmw_vmci/vmci_host.c
index 8a16a26e9658..b0416dcc590a 100644
--- a/drivers/misc/vmw_vmci/vmci_host.c
+++ b/drivers/misc/vmw_vmci/vmci_host.c
@@ -744,7 +744,6 @@ static int vmci_host_do_ctx_set_cpt_state(struct vmci_host_dev *vmci_host_dev,
struct vmci_ctx_chkpt_buf_info set_info;
u32 cid;
void *cpt_buf;
- int retval;

if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
vmci_ioctl_err("only valid for contexts\n");
@@ -754,29 +753,21 @@ 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)) {
+ vmci_ioctl_err("cannot allocate memory to set cpt state (type=%d)\n",
+ set_info.cpt_type);
+ 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,
set_info.buf_size, cpt_buf);

- retval = copy_to_user(uptr, &set_info, sizeof(set_info)) ? -EFAULT : 0;
-
-out:
kfree(cpt_buf);
- return retval;
+
+ return copy_to_user(uptr, &set_info, sizeof(set_info)) ? -EFAULT : 0;
}

static int vmci_host_do_get_context_id(struct vmci_host_dev *vmci_host_dev,
--
1.9.1
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