[PATCH 5.15 030/107] soundwire: qcom: fix device status array range

Greg Kroah-Hartman
2022-09-06T13:48:01Z

From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>

[ Upstream commit 4ef3f2aff1267bfa6d5a90c42a30b927b8aa239b ]

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>
Link: https://lore.kernel.org/r/20220708104747.8722-1-srinivas.kandagatla@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.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 2adc0a75c0515..1ce6f948e9a42 100644
--- a/drivers/soundwire/qcom.c
+++ b/drivers/soundwire/qcom.c
@@ -148,7 +148,7 @@ 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;
@@ -391,7 +391,7 @@ 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) {
@@ -411,7 +411,7 @@ 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));
--
2.35.1