nfs_write_end(): fix handling of short copies

What matters when deciding if we should make a page uptodate is not how much we _wanted_ to copy, but how much we actually have copied. As it is, on architectures that do not zero tail on short copy we can leave uninitialized data in page marked uptodate. Cc: [email protected] Signed-off-by: Al Viro <[email protected]>
redbrain17 · Dec 10, 2016 · c0cf3ef · c0cf3ef
1 parent e5517c2
commit c0cf3ef
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
@@ -374,7 +374,7 @@ static int nfs_write_end(struct file *file, struct address_space *mapping,
 	 */
 	if (!PageUptodate(page)) {
 		unsigned pglen = nfs_page_length(page);
-		unsigned end = offset + len;
+		unsigned end = offset + copied;
 
 		if (pglen == 0) {
 			zero_user_segments(page, 0, offset,