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convert a bunch of open-coded instances of memdup_user_nul()

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A _lot_ of ->write() instances were open-coding it; some are
converted to memdup_user_nul(), a lot more remain...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-12-24 00:06:05 -05:00
commit 16e5c1fc36
12 changed files with 71 additions and 197 deletions
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12
kernel/trace/blktrace.c
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@ -349,16 +349,10 @@ static ssize_t blk_msg_write(struct file *filp, const char __user *buffer,
if (count >= BLK_TN_MAX_MSG)
return -EINVAL;
msg = kmalloc(count + 1, GFP_KERNEL);
if (msg == NULL)
return -ENOMEM;
msg = memdup_user_nul(buffer, count);
if (IS_ERR(msg))
return PTR_ERR(msg);
if (copy_from_user(msg, buffer, count)) {
kfree(msg);
return -EFAULT;
}
msg[count] = '\0';
bt = filp->private_data;
__trace_note_message(bt, "%s", msg);
kfree(msg);