From f6ac55b6c156cebf750376dc08e06ffdade82717 Mon Sep 17 00:00:00 2001
From: Sanchit Garg <sancgarg@linux.vnet.ibm.com>
Date: Wed, 27 Oct 2010 09:41:01 +0530
Subject: [PATCH] net/9p: Return error on read with NULL buffer
This patch ensures that a read(fd, NULL, 10) returns EFAULT on a 9p file.
Signed-off-by: Sanchit Garg <sancgarg@linux.vnet.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
---
net/9p/client.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/net/9p/client.c b/net/9p/client.c
index 8df80fb86f236..a848bca9fbffc 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -1286,16 +1286,13 @@ p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
if (data) {
memmove(data, dataptr, count);
- }
-
- if (udata) {
+ } else {
err = copy_to_user(udata, dataptr, count);
if (err) {
err = -EFAULT;
goto free_and_error;
}
}
-
p9_free_req(clnt, req);
return count;
--
2.30.2