From: Sagi Grimberg <sagi@grimberg.me>
Date: Mon, 5 Sep 2022 10:54:17 +0000 (+0300)
Subject: nvme-tcp: fix UAF when detecting digest errors
X-Git-Tag: v5.19.9~58
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c3eb461aa56e6fa94fb80442ba2586bd223a8886;p=thirdparty%2Fkernel%2Fstable.git

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 7a9e6ffa23429..40bd68ba1040a 100644
--- 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 */