[PATCH v2] soundwire: qcom: fix device status array range

[PATCH v2] soundwire: qcom: fix device status array range

[Srinivas Kandagatla]

This patch updates device status array range from 11 to 12 as we will
be reading status from device number 0 to device number 11 inclusive.

Without this patch we can potentially access status array out of range
during auto-enumeration.

Fixes: aa1262ca6695 ("soundwire: qcom: Check device status before reading devid")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
 drivers/soundwire/qcom.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
index 9df970eeca45..16a4a51978ca 100644
--- a/drivers/soundwire/qcom.c
+++ b/drivers/soundwire/qcom.c
@@ -169,7 +169,7 @@ struct qcom_swrm_ctrl {
 	u8 wcmd_id;
 	struct qcom_swrm_port_config pconfig[QCOM_SDW_MAX_PORTS];
 	struct sdw_stream_runtime *sruntime[SWRM_MAX_DAIS];
-	enum sdw_slave_status status[SDW_MAX_DEVICES];
+	enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
 	int (*reg_read)(struct qcom_swrm_ctrl *ctrl, int reg, u32 *val);
 	int (*reg_write)(struct qcom_swrm_ctrl *ctrl, int reg, int val);
 	u32 slave_status;
@@ -420,7 +420,7 @@ static int qcom_swrm_get_alert_slave_dev_num(struct qcom_swrm_ctrl *ctrl)
 
 	ctrl->reg_read(ctrl, SWRM_MCP_SLV_STATUS, &val);
 
-	for (dev_num = 0; dev_num < SDW_MAX_DEVICES; dev_num++) {
+	for (dev_num = 0; dev_num <= SDW_MAX_DEVICES; dev_num++) {
 		status = (val >> (dev_num * SWRM_MCP_SLV_STATUS_SZ));
 
 		if ((status & SWRM_MCP_SLV_STATUS_MASK) == SDW_SLAVE_ALERT) {
@@ -440,7 +440,7 @@ static void qcom_swrm_get_device_status(struct qcom_swrm_ctrl *ctrl)
 	ctrl->reg_read(ctrl, SWRM_MCP_SLV_STATUS, &val);
 	ctrl->slave_status = val;
 
-	for (i = 0; i < SDW_MAX_DEVICES; i++) {
+	for (i = 0; i <= SDW_MAX_DEVICES; i++) {
 		u32 s;
 
 		s = (val >> (i * 2));
-- 
2.25.1

Re: [PATCH v2] soundwire: qcom: fix device status array range

[Vinod Koul]

On 08-07-22, 11:47, Srinivas Kandagatla wrote:
> This patch updates device status array range from 11 to 12 as we will
> be reading status from device number 0 to device number 11 inclusive.
> 
> Without this patch we can potentially access status array out of range
> during auto-enumeration.

Applied, thanks

-- 
~Vinod