[PATCH 5.4 104/108] nvme-tcp: fix UAF when detecting digest errors

From: Greg Kroah-Hartman
Date: Tue Sep 13 2022 - 11:08:20 EST


From: Sagi Grimberg <sagi@xxxxxxxxxxx>

[ 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@xxxxxxx>
Signed-off-by: Sagi Grimberg <sagi@xxxxxxxxxxx>
Reviewed-by: Daniel Wagner <dwagner@xxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/nvme/host/tcp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index 2a27ac9aedbaa..3169859cd3906 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -1074,7 +1074,7 @@ static void nvme_tcp_io_work(struct work_struct *w)
if (result > 0)
pending = true;

- if (!pending)
+ if (!pending || !queue->rd_enabled)
return;

} while (!time_after(jiffies, deadline)); /* quota is exhausted */
--
2.35.1