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NFS: Fix use of copy_to_user() in idmap_pipe_upcall

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The idmap_pipe_upcall() function expects the copy_to_user() function to
return a negative error value if the call fails, but copy_to_user()
returns an unsigned long number of bytes that couldn't be copied.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever 2007-12-20 14:54:42 -05:00 committed by Trond Myklebust
parent 369af0f116
commit a661b77fc1
1 changed files with 6 additions and 8 deletions
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14
fs/nfs/idmap.c
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@ -358,17 +358,15 @@ idmap_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg,
char __user *dst, size_t buflen)
{
char *data = (char *)msg->data + msg->copied;
ssize_t mlen = msg->len - msg->copied;
ssize_t left;
if (mlen > buflen)
mlen = buflen;
size_t mlen = min(msg->len, buflen);
unsigned long left;
left = copy_to_user(dst, data, mlen);
if (left < 0) {
msg->errno = left;
return left;
if (left == mlen) {
msg->errno = -EFAULT;
return -EFAULT;
}
mlen -= left;
msg->copied += mlen;
msg->errno = 0;