[PATCH] firmware: qcom: pas_tee: handle a NULL resource table

[Jorge Ramirez-Ortiz <jorge.ramirez@oss.qualcomm.com>]

Stopping a remote processor clears its cached resource table pointer
but leaves the size set. On restart, qcom_pas_tee_get_rsc_table() copies
from NULL when the firmware has no resource table:

  pc : __pi_memcpy_generic+0x110/0x22c
  lr : qcom_pas_tee_get_rsc_table+0xf0/0x244

Zero the input size when the table is NULL so the copy is skipped.

Fixes: b6f7978da0c4 ("firmware: qcom: Add a PAS TEE service")
Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez@oss.qualcomm.com>
---
 drivers/firmware/qcom/qcom_pas_tee.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/qcom/qcom_pas_tee.c b/drivers/firmware/qcom/qcom_pas_tee.c
index ac33a00687aa..a52a7df385ff 100644
--- a/drivers/firmware/qcom/qcom_pas_tee.c
+++ b/drivers/firmware/qcom/qcom_pas_tee.c
@@ -230,12 +230,15 @@ static void *qcom_pas_tee_get_rsc_table(struct device *dev,
 		},
 		[1] = {
 			.attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT,
-			.u.memref.size = input_rt_size,
 		}
 	};
 	void *rt_buf = NULL;
 	int ret;
 
+	if (!input_rt)
+		input_rt_size = 0;
+	param[1].u.memref.size = input_rt_size;
+
 	ret = tee_client_invoke_func(data->ctx, &inv_arg, param);
 	if (ret < 0 || inv_arg.ret != 0) {
 		dev_err(dev, "PAS get RT failed, pas_id: %d, ret: %d, err: 0x%x\n",
-- 
2.54.0