Reviewed-by: Evan Quan <evan.q...@amd.com>
-----Original Message-----
From: Colin King <colin.k...@canonical.com>
Sent: Friday, November 15, 2019 5:48 PM
To: Rex Zhu <rex....@amd.com>; Quan, Evan <evan.q...@amd.com>; Deucher,
Alexander <alexander.deuc...@amd.com>; Koenig, Christian
<christian.koe...@amd.com>; Zhou, David(ChunMing) <david1.z...@amd.com>; David
Airlie <airl...@linux.ie>; Daniel Vetter <dan...@ffwll.ch>;
amd-...@lists.freedesktop.org; dri-devel@lists.freedesktop.org
Cc: kernel-janit...@vger.kernel.org; linux-ker...@vger.kernel.org
Subject: [PATCH][next] drm/amdgpu/powerplay: fix dereference before null check
of pointer hwmgr
From: Colin Ian King <colin.k...@canonical.com>
The assignment of adev dereferences pointer hwmgr before hwmgr is null checked,
hence there is a potential null pointer deference issue. Fix this by assigning
adev after the null check.
Addresses-Coverity: ("Dereference before null check")
Fixes: 0896d2f7ba4d ("drm/amdgpu/powerplay: properly set PP_GFXOFF_MASK")
Signed-off-by: Colin Ian King <colin.k...@canonical.com>
---
drivers/gpu/drm/amd/powerplay/hwmgr/hwmgr.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/hwmgr.c
b/drivers/gpu/drm/amd/powerplay/hwmgr/hwmgr.c
index 443625c83ec9..d2909c91d65b 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/hwmgr.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/hwmgr.c
@@ -81,7 +81,7 @@ static void hwmgr_init_workload_prority(struct pp_hwmgr
*hwmgr)
int hwmgr_early_init(struct pp_hwmgr *hwmgr) {
- struct amdgpu_device *adev = hwmgr->adev;
+ struct amdgpu_device *adev;
if (!hwmgr)
return -EINVAL;
@@ -96,6 +96,8 @@ int hwmgr_early_init(struct pp_hwmgr *hwmgr)
hwmgr_init_workload_prority(hwmgr);
hwmgr->gfxoff_state_changed_by_workload = false;
+ adev = hwmgr->adev;
+
switch (hwmgr->chip_family) {
case AMDGPU_FAMILY_CI:
adev->pm.pp_feature &= ~PP_GFXOFF_MASK;
--
2.20.1
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