nvme-tcp: fix UAF when detecting digest errors

[ Upstream commit 160f3549a907a50e51a8518678ba2dcf2541abea ]

We should also bail from the io_work loop when we set rd_enabled to true,
so we don't attempt to read data from the socket when the TCP stream is
already out-of-sync or corrupted.

Fixes: 3f2304f8c6d6 ("nvme-tcp: add NVMe over TCP host driver")
Reported-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index 7a9e6ffa23429079269de605dff903e1df95255d..40bd68ba1040a0b142062cade0ad014ec2524669 100644 (file)
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -1227,7 +1227,7 @@ static void nvme_tcp_io_work(struct work_struct *w)
                else if (unlikely(result < 0))
                        return;
 
-               if (!pending)
+               if (!pending || !queue->rd_enabled)
                        return;
 
        } while (!time_after(jiffies, deadline)); /* quota is exhausted */