From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
The pointer hwmgr is dereferenced when initializing pointer adev however
it is a little later hwmgr is null checked, implying it could potentially
be null hence the assignment of adev may cause a null pointer dereference.
Fix this by moving the assignment after the null check. Note that I did
think of removing adev as it is only used once, however, hwmgr->adev is
a void * pointer, so using adev avoids some ugly casting so it makes sense
to still use it.
Addresses-Coverity: ("Dereference before null check")
Fixes: 59156faf810e ("drm/amd/pp: Remove the cgs wrapper for notify smu version on APU")
Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/powerplay/smumgr/smu8_smumgr.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/amd/powerplay/smumgr/smu8_smumgr.c b/drivers/gpu/drm/amd/powerplay/smumgr/smu8_smumgr.c
index 8189fe402c6d..12815b3830e4 100644
--- a/drivers/gpu/drm/amd/powerplay/smumgr/smu8_smumgr.c
+++ b/drivers/gpu/drm/amd/powerplay/smumgr/smu8_smumgr.c
@@ -722,13 +722,11 @@ static int smu8_request_smu_load_fw(struct pp_hwmgr *hwmgr)
static int smu8_start_smu(struct pp_hwmgr *hwmgr)
{
- struct amdgpu_device *adev = hwmgr->adev;
-
+ struct amdgpu_device *adev;
uint32_t index = SMN_MP1_SRAM_START_ADDR +
SMU8_FIRMWARE_HEADER_LOCATION +
offsetof(struct SMU8_Firmware_Header, Version);
-
if (hwmgr == NULL || hwmgr->device == NULL)
return -EINVAL;
@@ -738,6 +736,7 @@ static int smu8_start_smu(struct pp_hwmgr *hwmgr)
((hwmgr->smu_version >> 16) & 0xFF),
((hwmgr->smu_version >> 8) & 0xFF),
(hwmgr->smu_version & 0xFF));
+ adev = hwmgr->adev;
adev->pm.fw_version = hwmgr->smu_version >> 8;
return smu8_request_smu_load_fw(hwmgr);
--
2.20.1
