Re: [syzbot] [exfat?] KMSAN: kernel-infoleak in pipe_read

[Edward Adam Davis]

#syz test

diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 1abb32c0da50..59832f73a4f2 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -478,6 +478,7 @@ size_t copy_page_from_iter_atomic(struct page *page, size_t offset,
 		}
 
 		p = kmap_atomic(page) + offset;
+		memset(p, 0, n);
 		n = __copy_from_iter(p, n, i);
 		kunmap_atomic(p);
 		copied += n;