linux-kernel - [PATCH 5.6 105/161] firmware: imx: scu: Fix corruption of header

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Date:   Tue, 16 Jun 2020 17:34:55 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Franck LENORMAND <franck.lenormand@....com>,
        Leonard Crestez <leonard.crestez@....com>,
        Dong Aisheng <aisheng.dong@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.6 105/161] firmware: imx: scu: Fix corruption of header

From: Franck LENORMAND <franck.lenormand@....com>

[ Upstream commit f5f27b79eab80de0287c243a22169e4876b08d5e ]

The header of the message to send can be changed if the
response is longer than the request:
 - 1st word, the header is sent
 - the remaining words of the message are sent
 - the response is received asynchronously during the
   execution of the loop, changing the size field in
   the header
 - the for loop test the termination condition using
   the corrupted header

It is the case for the API build_info which has just a
header as request but 3 words in response.

This issue is fixed storing the header locally instead of
using a pointer on it.

Fixes: edbee095fafb (firmware: imx: add SCU firmware driver support)

Signed-off-by: Franck LENORMAND <franck.lenormand@....com>
Reviewed-by: Leonard Crestez <leonard.crestez@....com>
Signed-off-by: Leonard Crestez <leonard.crestez@....com>
Cc: stable@...r.kernel.org
Reviewed-by: Dong Aisheng <aisheng.dong@....com>
Signed-off-by: Shawn Guo <shawnguo@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/firmware/imx/imx-scu.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/firmware/imx/imx-scu.c b/drivers/firmware/imx/imx-scu.c
index e94a5585b698..b3da2e193ad2 100644
--- a/drivers/firmware/imx/imx-scu.c
+++ b/drivers/firmware/imx/imx-scu.c
@@ -158,7 +158,7 @@ static void imx_scu_rx_callback(struct mbox_client *c, void *msg)
 
 static int imx_scu_ipc_write(struct imx_sc_ipc *sc_ipc, void *msg)
 {
-	struct imx_sc_rpc_msg *hdr = msg;
+	struct imx_sc_rpc_msg hdr = *(struct imx_sc_rpc_msg *)msg;
 	struct imx_sc_chan *sc_chan;
 	u32 *data = msg;
 	int ret;
@@ -166,13 +166,13 @@ static int imx_scu_ipc_write(struct imx_sc_ipc *sc_ipc, void *msg)
 	int i;
 
 	/* Check size */
-	if (hdr->size > IMX_SC_RPC_MAX_MSG)
+	if (hdr.size > IMX_SC_RPC_MAX_MSG)
 		return -EINVAL;
 
-	dev_dbg(sc_ipc->dev, "RPC SVC %u FUNC %u SIZE %u\n", hdr->svc,
-		hdr->func, hdr->size);
+	dev_dbg(sc_ipc->dev, "RPC SVC %u FUNC %u SIZE %u\n", hdr.svc,
+		hdr.func, hdr.size);
 
-	size = sc_ipc->fast_ipc ? 1 : hdr->size;
+	size = sc_ipc->fast_ipc ? 1 : hdr.size;
 	for (i = 0; i < size; i++) {
 		sc_chan = &sc_ipc->chans[i % 4];
 
-- 
2.25.1