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authorChuck Lever <chuck.lever@oracle.com>2007-12-20 14:54:42 -0500
committerTrond Myklebust <Trond.Myklebust@netapp.com>2008-01-30 02:06:01 -0500
commita661b77fc12a172edea4b709e37f8cd58a6bd500 (patch)
treeded0b18213329ec39682ad63530e849fafed22c0 /fs
parent369af0f1166f7a637751110395496cee156b4297 (diff)
downloadlinux-a661b77fc12a172edea4b709e37f8cd58a6bd500.tar.gz
NFS: Fix use of copy_to_user() in idmap_pipe_upcall
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfs/idmap.c14
1 files changed, 6 insertions, 8 deletions
diff --git a/fs/nfs/idmap.c b/fs/nfs/idmap.c
index c56fc7d5a46..d93e071b900 100644
--- a/fs/nfs/idmap.c
+++ b/fs/nfs/idmap.c
@@ -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;