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firmware: imx: scu: Fix corruption of header

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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: edbee095fa (firmware: imx: add SCU firmware driver support)

Signed-off-by: Franck LENORMAND <franck.lenormand@nxp.com>
Reviewed-by: Leonard Crestez <leonard.crestez@nxp.com>
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Cc: stable@vger.kernel.org
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Franck LENORMAND 2020-03-26 00:00:05 +02:00 committed by Shawn Guo
parent f25a066d1a
commit f5f27b79ea
1 changed files with 5 additions and 5 deletions
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10
drivers/firmware/imx/imx-scu.c
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@ -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];