netdev - [PATCH AUTOSEL 4.9 049/141] net/wan/fsl_ucc_hdlc: reject muram offsets above 64K

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Date:   Fri, 14 Feb 2020 11:19:49 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Rasmus Villemoes <linux@...musvillemoes.dk>,
        Qiang Zhao <qiang.zhao@....com>, Timur Tabi <timur@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Li Yang <leoyang.li@....com>, Sasha Levin <sashal@...nel.org>,
        netdev@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH AUTOSEL 4.9 049/141] net/wan/fsl_ucc_hdlc: reject muram offsets above 64K

From: Rasmus Villemoes <linux@...musvillemoes.dk>

[ Upstream commit 148587a59f6b85831695e0497d9dd1af5f0495af ]

Qiang Zhao points out that these offsets get written to 16-bit
registers, and there are some QE platforms with more than 64K
muram. So it is possible that qe_muram_alloc() gives us an allocation
that can't actually be used by the hardware, so detect and reject
that.

Reported-by: Qiang Zhao <qiang.zhao@....com>
Reviewed-by: Timur Tabi <timur@...nel.org>
Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
Acked-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Li Yang <leoyang.li@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wan/fsl_ucc_hdlc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/wan/fsl_ucc_hdlc.c b/drivers/net/wan/fsl_ucc_hdlc.c
index af85a1b3135e2..87bf05a81db50 100644
--- a/drivers/net/wan/fsl_ucc_hdlc.c
+++ b/drivers/net/wan/fsl_ucc_hdlc.c
@@ -209,6 +209,11 @@ static int uhdlc_init(struct ucc_hdlc_private *priv)
 		ret = -ENOMEM;
 		goto free_riptr;
 	}
+	if (riptr != (u16)riptr || tiptr != (u16)tiptr) {
+		dev_err(priv->dev, "MURAM allocation out of addressable range\n");
+		ret = -ENOMEM;
+		goto free_tiptr;
+	}
 
 	/* Set RIPTR, TIPTR */
 	iowrite16be(riptr, &priv->ucc_pram->riptr);
-- 
2.20.1