Controller only supports up to max of 1-11 device ids via auto-enumeration,
and it has only those many registers.
In the existing code, we can protentially cross this boundary and read incorrect
registers.
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Fixes: a6e6581942ca ("soundwire: qcom: add auto enumeration support")
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
---
Thanks to Dan for reporting an overflow issue, which turned out to be
another issue, where we could read registers that do not belong to
auto-enumeration devid.
Either way this fixes both issues, one reported by Dan and other
incorrect register access.
Thanks,
Srini
drivers/soundwire/qcom.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
index 9df970eeca45..dd1365a44458 100644
--- a/drivers/soundwire/qcom.c
+++ b/drivers/soundwire/qcom.c
@@ -119,6 +119,8 @@
#define MAX_FIFO_RD_RETRY 3
#define SWR_OVERFLOW_RETRY_COUNT 30
#define SWRM_LINK_STATUS_RETRY_CNT 100
+/* devid 1 - 11 */
+#define SWRM_MAX_AUTO_ENUM_DEVICES 11
enum {
MASTER_ID_WSA = 1,
@@ -479,7 +481,7 @@ static int qcom_swrm_enumerate(struct sdw_bus *bus)
int i;
char *buf1 = (char *)&val1, *buf2 = (char *)&val2;
- for (i = 1; i <= SDW_MAX_DEVICES; i++) {
+ for (i = 1; i <= SWRM_MAX_AUTO_ENUM_DEVICES; i++) {
/* do not continue if the status is Not Present */
if (!ctrl->status[i])
continue;
--
2.25.1
