[PATCH] undo do_readv_writev() behavior change

Bugme bug 4326: http://bugme.osdl.org/show_bug.cgi?id=4326 reports:

executing the systemcall readv with Bad argument
->len == -1) it gives out error EFAULT instead of EINVAL 


Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/read_write.c b/fs/read_write.c
index 6be4b1a1956b..c4c2bee373ed 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -467,10 +467,10 @@ static ssize_t do_readv_writev(int type, struct file *file,
                 void __user *buf = iov[seg].iov_base;
                 ssize_t len = (ssize_t)iov[seg].iov_len;
 
-                if (unlikely(!access_ok(vrfy_dir(type), buf, len)))
-                        goto Efault;
                 if (len < 0)    /* size_t not fitting an ssize_t .. */
                         goto out;
+                if (unlikely(!access_ok(vrfy_dir(type), buf, len)))
+                        goto Efault;
                 tot_len += len;
                 if ((ssize_t)tot_len < 0) /* maths overflow on the ssize_t */
                         goto out;