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fuse: fix writepages on 32bit

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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: 6eaf4782eb ("fuse: writepages: crop secondary requests")
Cc: <stable@vger.kernel.org> # v3.13
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2019-04-24 17:05:06 +02:00
parent 085b775580
commit 9de5be06d0
1 changed files with 1 additions and 1 deletions
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2
fs/fuse/file.c
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@ -1586,7 +1586,7 @@ __acquires(fi->lock)
{ {
struct fuse_conn *fc = get_fuse_conn(inode); struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_inode *fi = get_fuse_inode(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; struct fuse_req *req;
while (fi->writectr >= 0 && !list_empty(&fi->queued_writes)) { while (fi->writectr >= 0 && !list_empty(&fi->queued_writes)) {