9p: trans_fd, bail out if recv fcall if missing

req->rc is pre-allocated early on with p9_tag_alloc and shouldn't be missing

Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

1 files changed, 6 insertions, 7 deletions

diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
index a270dcc4ad9a..7bc2208b6cc4 100644
--- a/net/9p/trans_fd.c
+++ b/net/9p/trans_fd.c
@@ -356,13 +356,12 @@ static void p9_read_work(struct work_struct *work)
                 }
 
                 if (m->req->rc == NULL) {
-                        m->req->rc = kmalloc(sizeof(struct p9_fcall) +
-                                                m->client->msize, GFP_NOFS);
-                        if (!m->req->rc) {
-                                m->req = NULL;
-                                err = -ENOMEM;
-                                goto error;
-                        }
+                        p9_debug(P9_DEBUG_ERROR,
+                                 "No recv fcall for tag %d (req %p), disconnecting!\n",
+                                 m->rc.tag, m->req);
+                        m->req = NULL;
+                        err = -EIO;
+                        goto error;
                 }
                 m->rc.sdata = (char *)m->req->rc + sizeof(struct p9_fcall);
                 memcpy(m->rc.sdata, m->tmp_buf, m->rc.capacity);