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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
parent 7e935c7ca1
commit 16e5c1fc36
12 changed files with 71 additions and 197 deletions
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11
lib/dynamic_debug.c
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@ -657,14 +657,9 @@ static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf,
pr_warn("expected <%d bytes into control\n", USER_BUF_PAGE);
return -E2BIG;
}
tmpbuf = kmalloc(len + 1, GFP_KERNEL);
if (!tmpbuf)
return -ENOMEM;
if (copy_from_user(tmpbuf, ubuf, len)) {
kfree(tmpbuf);
return -EFAULT;
}
tmpbuf[len] = '\0';
tmpbuf = memdup_user_nul(ubuf, len);
if (IS_ERR(tmpbuf))
return PTR_ERR(tmpbuf);
vpr_info("read %d bytes from userspace\n", (int)len);
ret = ddebug_exec_queries(tmpbuf, NULL);