copy_to/from_user() returns the number of bytes which we were not able
to copy. It doesn't return an error code.
Also a couple places had a printk() on error and I removed that because
people can take advantage of it to fill /var/log/messages with spam.
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
This patch has some checkpatch warnings because the alignment is off.
That was a problem in the original code and needs to be fixed in a separate patch.
Also there is another bug:
drivers/staging/rdma/hfi1/diag.c:1160 hfi1_ioctl() error: scheduling with locks held: 'spin_lock:snoop_lock'
That function needs to be re-worked and simplified and technically I'm
still on vacation so I didn't address it.
diff --git a/drivers/staging/rdma/hfi1/diag.c b/drivers/staging/rdma/hfi1/diag.c
index 6777d6b..ce01dee 100644
--- a/drivers/staging/rdma/hfi1/diag.c
+++ b/drivers/staging/rdma/hfi1/diag.c
@@ -1012,11 +1012,10 @@ static long hfi1_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
case HFI1_SNOOP_IOCSETLINKSTATE_EXTRA:
memset(&link_info, 0, sizeof(link_info));
- ret = copy_from_user(&link_info,
+ if (copy_from_user(&link_info,
(struct hfi1_link_info __user *)arg,
- sizeof(link_info));
- if (ret)
- break;
+ sizeof(link_info)))
+ ret = -EFAULT;
value = link_info.port_state;
index = link_info.port_number;
@@ -1080,9 +1079,10 @@ static long hfi1_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
case HFI1_SNOOP_IOCGETLINKSTATE_EXTRA:
if (cmd == HFI1_SNOOP_IOCGETLINKSTATE_EXTRA) {
memset(&link_info, 0, sizeof(link_info));
- ret = copy_from_user(&link_info,
+ if (copy_from_user(&link_info,
(struct hfi1_link_info __user *)arg,
- sizeof(link_info));
+ sizeof(link_info)))
+ ret = -EFAULT;
index = link_info.port_number;
} else {
ret = __get_user(index, (int __user *) arg);
@@ -1114,9 +1114,10 @@ static long hfi1_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
ppd->link_speed_active;
link_info.link_width_active =
ppd->link_width_active;
- ret = copy_to_user(
+ if (copy_to_user(
(struct hfi1_link_info __user *)arg,
- &link_info, sizeof(link_info));
+ &link_info, sizeof(link_info)))
+ ret = -EFAULT;
} else {
ret = __put_user(value, (int __user *)arg);
}
@@ -1142,10 +1143,9 @@ static long hfi1_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
snoop_dbg("Setting filter");
/* just copy command structure */
argp = (unsigned long *)arg;
- ret = copy_from_user(&filter_cmd, (void __user *)argp,
- sizeof(filter_cmd));
- if (ret < 0) {
- pr_alert("Error copying filter command\n");
+ if (copy_from_user(&filter_cmd, (void __user *)argp,
+ sizeof(filter_cmd))) {
+ ret = -EFAULT;
break;
}
if (filter_cmd.opcode >= HFI1_MAX_FILTERS) {
@@ -1167,12 +1167,11 @@ static long hfi1_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
break;
}
/* copy remaining data from userspace */
- ret = copy_from_user((u8 *)filter_value,
+ if (copy_from_user((u8 *)filter_value,
(void __user *)filter_cmd.value_ptr,
- filter_cmd.length);
- if (ret < 0) {
+ filter_cmd.length)) {
kfree(filter_value);
- pr_alert("Error copying filter data\n");
+ ret = -EFAULT;
break;
}
/* Drain packets first */
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