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staging: comedi: use memdup_user to simplify code 

Use memdup_user rather than duplicating implementation. Fix following
coccinelle warnings:

drivers/staging/comedi/comedi_fops.c:1425:5-12: WARNING opportunity for memdup_user
drivers/staging/comedi/comedi_fops.c:1553:6-13: WARNING opportunity for memdup_user

Signed-off-by: Teodora Baluta <teobaluta@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Teodora Baluta 2013-10-29 00:09:18 +02:00 committed by Greg Kroah-Hartman
parent 8cf9ff570b
commit f0c80e4e1c
1 changed files with 10 additions and 23 deletions
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33
drivers/staging/comedi/comedi_fops.c
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@ -1421,17 +1421,11 @@ static int do_cmd_ioctl(struct comedi_device *dev,
async->cmd = cmd;
async->cmd.data = NULL;
/* load channel/gain list */
async->cmd.chanlist =
kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL);
if (!async->cmd.chanlist) {
DPRINTK("allocation failed\n");
return -ENOMEM;
}
if (copy_from_user(async->cmd.chanlist, user_chanlist,
async->cmd.chanlist_len * sizeof(int))) {
DPRINTK("fault reading chanlist\n");
ret = -EFAULT;
async->cmd.chanlist = memdup_user(user_chanlist,
async->cmd.chanlist_len * sizeof(int));
if (IS_ERR(async->cmd.chanlist)) {
ret = PTR_ERR(async->cmd.chanlist);
DPRINTK("memdup_user failed with code %d\n", ret);
goto cleanup;
}
@ -1549,18 +1543,11 @@ static int do_cmdtest_ioctl(struct comedi_device *dev,
/* load channel/gain list */
if (cmd.chanlist) {
chanlist =
kmalloc(cmd.chanlist_len * sizeof(int), GFP_KERNEL);
if (!chanlist) {
DPRINTK("allocation failed\n");
ret = -ENOMEM;
goto cleanup;
}
if (copy_from_user(chanlist, user_chanlist,
cmd.chanlist_len * sizeof(int))) {
DPRINTK("fault reading chanlist\n");
ret = -EFAULT;
chanlist = memdup_user(user_chanlist,
cmd.chanlist_len * sizeof(int));
if (IS_ERR(chanlist)) {
ret = PTR_ERR(chanlist);
DPRINTK("memdup_user exited with code %d", ret);
goto cleanup;
}