9p/trans_fd: abort p9_read_work if req status changed

p9_read_work would try to handle an errored req even if it got put to
error state by another thread between the lookup (that worked) and the
time it had been fully read.
The request itself is safe to use because we hold a ref to it from the
lookup (for m->rreq, so it was safe to read into the request data buffer
until this point), but the req_list has been deleted at the same time
status changed, and client_cb already has been called as well, so we
should not do either.

Link: http://lkml.kernel.org/r/1539057956-23741-1-git-send-email-asmadeus@codewreck.org
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Reported-by: syzbot+2222c34dc40b515f30dc@syzkaller.appspotmail.com
Cc: Eric Van Hensbergen <ericvh@gmail.com>
Cc: Latchesar Ionkov <lucho@ionkov.net>

diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
index 12559c474ddec13b1c8398fbea0eed52a105c089..a0317d459cdefb7f41d8b65fa8eb61757b1e797f 100644 (file)
--- a/net/9p/trans_fd.c
+++ b/net/9p/trans_fd.c
@@ -292,7 +292,6 @@ static void p9_read_work(struct work_struct *work)
        __poll_t n;
        int err;
        struct p9_conn *m;
-       int status = REQ_STATUS_ERROR;
 
        m = container_of(work, struct p9_conn, rq);
 
@@ -375,11 +374,17 @@ static void p9_read_work(struct work_struct *work)
                p9_debug(P9_DEBUG_TRANS, "got new packet\n");
                m->rreq->rc.size = m->rc.offset;
                spin_lock(&m->client->lock);
-               if (m->rreq->status != REQ_STATUS_ERROR)
-                       status = REQ_STATUS_RCVD;
-               list_del(&m->rreq->req_list);
-               /* update req->status while holding client->lock  */
-               p9_client_cb(m->client, m->rreq, status);
+               if (m->rreq->status == REQ_STATUS_SENT) {
+                       list_del(&m->rreq->req_list);
+                       p9_client_cb(m->client, m->rreq, REQ_STATUS_RCVD);
+               } else {
+                       spin_unlock(&m->client->lock);
+                       p9_debug(P9_DEBUG_ERROR,
+                                "Request tag %d errored out while we were reading the reply\n",
+                                m->rc.tag);
+                       err = -EIO;
+                       goto error;
+               }
                spin_unlock(&m->client->lock);
                m->rc.sdata = NULL;
                m->rc.offset = 0;