From: Miklos Szeredi <mszeredi@redhat.com>
Date: Wed, 24 Apr 2019 15:05:06 +0000 (+0200)
Subject: fuse: fix writepages on 32bit
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=9de5be06d0a89ca97b5ab902694d42dfd2bb77d2;p=linux.git

fuse: fix writepages on 32bit

Writepage requests were cropped to i_size & 0xffffffff, which meant that
mmaped writes to any file larger than 4G might be silently discarded.

Fix by storing the file size in a properly sized variable (loff_t instead
of size_t).

Reported-by: Antonio SJ Musumeci <trapexit@spawn.link>
Fixes: 6eaf4782eb09 ("fuse: writepages: crop secondary requests")
Cc: <stable@vger.kernel.org> # v3.13
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
---

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 06096b60f1df2..5428c81879b2e 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1586,7 +1586,7 @@ __acquires(fi->lock)
 {
 	struct fuse_conn *fc = get_fuse_conn(inode);
 	struct fuse_inode *fi = get_fuse_inode(inode);
-	size_t crop = i_size_read(inode);
+	loff_t crop = i_size_read(inode);
 	struct fuse_req *req;
 
 	while (fi->writectr >= 0 && !list_empty(&fi->queued_writes)) {