From: Frederik Deweerdt <deweerdt@free.fr>

At the beginning of the routine, "copied" is set to 0, but it is no good
because in lines 805 and 812 it is set to other values.  Finally, the
routine returns as if it copied 12 (=ENOMEM) bytes less than it actually
did.

Signed-off-by: Frederik Deweerdt <frederik.deweerdt@gmail.com>
Acked-by: Eric Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 fs/proc/base.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff -puN fs/proc/base.c~fix-mem_write-return-value fs/proc/base.c
--- a/fs/proc/base.c~fix-mem_write-return-value
+++ a/fs/proc/base.c
@@ -797,7 +797,7 @@ out_no_task:
 static ssize_t mem_write(struct file * file, const char * buf,
 			 size_t count, loff_t *ppos)
 {
-	int copied = 0;
+	int copied;
 	char *page;
 	struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
 	unsigned long dst = *ppos;
@@ -814,6 +814,7 @@ static ssize_t mem_write(struct file * f
 	if (!page)
 		goto out;
 
+	copied = 0;
 	while (count > 0) {
 		int this_len, retval;
 
_