tree 0522c11fd4f43ca3d52e74fcfa164a91ff165d5f
parent 535bcd3c4e8d09a62a89b2f1f3b3a80e1b3fce4b
author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> 1369071315 +0530
committer Eric Van Hensbergen <ericvh@gmail.com> 1369751322 -0500

net/9p: Handle error in zero copy request correctly for 9p2000.u

For zero copy request, error will be encoded in the user space buffer.
So copy the error code correctly using copy_from_user. Here we use the
extra bytes we allocate for zero copy request. If total error details
are more than P9_ZC_HDR_SZ - 7 bytes, we return -EFAULT. The patch also
avoid a memory allocation in the error path.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>