fuse: handle zero sized retrieve correctly

commit 97e1532ef81acb31c30f9e75bf00306c33a77812 upstream.

Dereferencing req->page_descs[0] will Oops if req->max_pages is zero.

Reported-by: syzbot+c1e36d30ee3416289cc0@syzkaller.appspotmail.com
Tested-by: syzbot+c1e36d30ee3416289cc0@syzkaller.appspotmail.com
Fixes: b2430d7567a3 ("fuse: add per-page descriptor <offset, length> to fuse_req")
Cc: <stable@vger.kernel.org> # v3.9
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index ffcceb1..411f161 100644 (file)
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -1685,7 +1685,6 @@ static int fuse_retrieve(struct fuse_conn *fc, struct inode *inode,
        req->in.h.nodeid = outarg->nodeid;
        req->in.numargs = 2;
        req->in.argpages = 1;
-       req->page_descs[0].offset = offset;
        req->end = fuse_retrieve_end;
 
        index = outarg->offset >> PAGE_SHIFT;
@@ -1700,6 +1699,7 @@ static int fuse_retrieve(struct fuse_conn *fc, struct inode *inode,
 
                this_num = min_t(unsigned, num, PAGE_SIZE - offset);
                req->pages[req->num_pages] = page;
+               req->page_descs[req->num_pages].offset = offset;
                req->page_descs[req->num_pages].length = this_num;
                req->num_pages++;