From 486bad2e40e938cd68fd853b7a9fa3115a9d3a4a Mon Sep 17 00:00:00 2001
From: Jeff Layton <jlayton@redhat.com>
Date: Fri, 18 Dec 2009 16:28:20 -0500
Subject: sunrpc: on successful gss error pipe write, don't return error
When handling the gssd downcall, the kernel should distinguish between a
successful downcall that contains an error code and a failed downcall
(i.e. where the parsing failed or some other sort of problem occurred).
In the former case, gss_pipe_downcall should be returning the number of
bytes written to the pipe instead of an error. In the event of other
errors, we generally want the initiating task to retry the upcall so
we set msg.errno to -EAGAIN. An unexpected error code here is a bug
however, so BUG() in that case.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---
net/sunrpc/auth_gss/auth_gss.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
(limited to 'net')
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index 3c3c50f38a1c..66cb89c18347 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -644,7 +644,22 @@ gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
p = gss_fill_context(p, end, ctx, gss_msg->auth->mech);
if (IS_ERR(p)) {
err = PTR_ERR(p);
- gss_msg->msg.errno = (err == -EAGAIN) ? -EAGAIN : -EACCES;
+ switch (err) {
+ case -EACCES:
+ gss_msg->msg.errno = err;
+ err = mlen;
+ break;
+ case -EFAULT:
+ case -ENOMEM:
+ case -EINVAL:
+ case -ENOSYS:
+ gss_msg->msg.errno = -EAGAIN;
+ break;
+ default:
+ printk(KERN_CRIT "%s: bad return from "
+ "gss_fill_context: %ld\n", __func__, err);
+ BUG();
+ }
goto err_release_msg;
}
gss_msg->ctx = gss_get_ctx(ctx);
--
cgit