[PATCH] mailbox: imx-mailbox: fix scu msg header size check

From: peng . fan
Date: Tue Apr 14 2020 - 04:25:12 EST


From: Peng Fan <peng.fan@xxxxxxx>

The i.MX8 SCU message header size is the number of "u32" elements,
not "u8", so fix the check.

Reported-by: coverity-bot <keescook+coverity-bot@xxxxxxxxxxxx>
Addresses-Coverity-ID: 1461658 ("Memory - corruptions")
Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
---

V2:
I not include the fixes tag, since this patch still in next tree.

drivers/mailbox/imx-mailbox.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/mailbox/imx-mailbox.c b/drivers/mailbox/imx-mailbox.c
index 7906624a731c..c2398cb63ea0 100644
--- a/drivers/mailbox/imx-mailbox.c
+++ b/drivers/mailbox/imx-mailbox.c
@@ -154,12 +154,12 @@ static int imx_mu_scu_tx(struct imx_mu_priv *priv,

switch (cp->type) {
case IMX_MU_TYPE_TX:
- if (msg->hdr.size > sizeof(*msg)) {
+ if (msg->hdr.size > (sizeof(*msg) / 4)) {
/*
* The real message size can be different to
* struct imx_sc_rpc_msg_max size
*/
- dev_err(priv->dev, "Exceed max msg size (%zu) on TX, got: %i\n", sizeof(*msg), msg->hdr.size);
+ dev_err(priv->dev, "Exceed max msg size (%zu) on TX, got: %i\n", sizeof(*msg) / 4, msg->hdr.size);
return -EINVAL;
}

@@ -198,9 +198,9 @@ static int imx_mu_scu_rx(struct imx_mu_priv *priv,
imx_mu_xcr_rmw(priv, 0, IMX_MU_xCR_RIEn(0));
*data++ = imx_mu_read(priv, priv->dcfg->xRR[0]);

- if (msg.hdr.size > sizeof(msg)) {
+ if (msg.hdr.size > (sizeof(msg) / 4)) {
dev_err(priv->dev, "Exceed max msg size (%zu) on RX, got: %i\n",
- sizeof(msg), msg.hdr.size);
+ sizeof(msg) / 4, msg.hdr.size);
return -EINVAL;
}

--
2.16.4