[PATCH 5.4 141/168] firmware: imx: misc: Align imx sc msg structs to 4

Greg Kroah-Hartman
2020-03-10T12:54:17Z

From: Leonard Crestez <leonard.crestez@nxp.com>

commit 1e6a4eba693ac72e6f91b4252458c933110e5f4c upstream.

The imx SC api strongly assumes that messages are composed out of
4-bytes words but some of our message structs have odd sizeofs.

This produces many oopses with CONFIG_KASAN=y:

BUG: KASAN: stack-out-of-bounds in imx_mu_send_data+0x108/0x1f0

It shouldn't cause an issues in normal use because these structs are
always allocated on the stack.

Fixes: 15e1f2bc8b3b ("firmware: imx: add misc svc support")
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/firmware/imx/misc.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/firmware/imx/misc.c
+++ b/drivers/firmware/imx/misc.c
@@ -16,7 +16,7 @@ struct imx_sc_msg_req_misc_set_ctrl {
u32 ctrl;
u32 val;
u16 resource;
-} __packed;
+} __packed __aligned(4);

struct imx_sc_msg_req_cpu_start {
struct imx_sc_rpc_msg hdr;
@@ -30,12 +30,12 @@ struct imx_sc_msg_req_misc_get_ctrl {
struct imx_sc_rpc_msg hdr;
u32 ctrl;
u16 resource;
-} __packed;
+} __packed __aligned(4);

struct imx_sc_msg_resp_misc_get_ctrl {
struct imx_sc_rpc_msg hdr;
u32 val;
-} __packed;
+} __packed __aligned(4);

/*
* This function sets a miscellaneous control value.