[PATCH 2/2] platform/x86: ISST: Add a NULL check for sst_inst[]

[Srinivas Pandruvada]

To be consistent with other places, add a NULL check for failed socket
loading by checking isst_common.sst_inst[].

Fixes: d805456c712f ("platform/x86: ISST: Enumerate TPMI SST and create framework")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
---
 drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c b/drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c
index 68c3a06004eb..e6d370907c01 100644
--- a/drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c
+++ b/drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c
@@ -1433,6 +1433,8 @@ static int isst_if_get_tpmi_instance_count(void __user *argp)
 		return -EINVAL;
 
 	sst_inst = isst_common.sst_inst[tpmi_inst.socket_id];
+	if (!sst_inst)
+		return -EINVAL;
 
 	tpmi_inst.count = isst_instance_count(sst_inst);
 
-- 
2.55.0