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Subject[PATCH] staging: comedi: use memdup_user
Date
Use memdup_user() helper instead of open-coding to simplify the code.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
---
drivers/staging/comedi/comedi_fops.c | 22 +++++++---------------
1 file changed, 7 insertions(+), 15 deletions(-)

diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index f191c2a..4797c8f 100644
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -1450,22 +1450,14 @@ static int do_insnlist_ioctl(struct comedi_device *dev,
return -EFAULT;

data = kmalloc_array(MAX_SAMPLES, sizeof(unsigned int), GFP_KERNEL);
- if (!data) {
- ret = -ENOMEM;
- goto error;
- }
-
- insns = kcalloc(insnlist.n_insns, sizeof(*insns), GFP_KERNEL);
- if (!insns) {
- ret = -ENOMEM;
- goto error;
- }
+ if (!data)
+ return -ENOMEM;

- if (copy_from_user(insns, insnlist.insns,
- sizeof(*insns) * insnlist.n_insns)) {
- dev_dbg(dev->class_dev, "copy_from_user failed\n");
- ret = -EFAULT;
- goto error;
+ insns = memdup_user(insnlist.insns, sizeof(*insns) * insnlist.n_insns);
+ if (IS_ERR(insns)) {
+ dev_dbg(dev->class_dev, "memdup_user failed\n");
+ kfree(data);
+ return PTR_ERR(insns);
}

for (i = 0; i < insnlist.n_insns; i++) {
--
2.9.3
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