linux-kernel - [PATCH] drm/amdgpu/swsmu: Fix if statement in smu_baco_get

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Message-ID: <20240211150613.3583-1-d.dulov@aladdin.ru>
Date: Sun, 11 Feb 2024 07:06:13 -0800
From: Daniil Dulov <d.dulov@...ddin.ru>
To: David Airlie <airlied@...ux.ie>
CC: Daniil Dulov <d.dulov@...ddin.ru>, Christian König
	<christian.koenig@....com>, Alex Deucher <alexander.deucher@....com>, Daniel
 Vetter <daniel@...ll.ch>, Evan Quan <evan.quan@....com>,
	<amd-gfx@...ts.freedesktop.org>, <dri-devel@...ts.freedesktop.org>,
	<linux-kernel@...r.kernel.org>, <lvc-project@...uxtesting.org>
Subject: [PATCH] drm/amdgpu/swsmu: Fix if statement in smu_baco_get_state()

In smu_baco_get_state() smu->ppt_funcs->baco_get_state is checked for NULL.
If it is NULL then the pointer is dereferenced.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 6c45e480fe23 ("drm/amd/powerplay: clear the swSMU code layer")
Signed-off-by: Daniil Dulov <d.dulov@...ddin.ru>
---
 drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
index ee27970cfff9..0fadb6aacd4b 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
@@ -2497,7 +2497,7 @@ bool smu_baco_is_support(struct smu_context *smu)
 
 int smu_baco_get_state(struct smu_context *smu, enum smu_baco_state *state)
 {
-	if (smu->ppt_funcs->baco_get_state)
+	if (!smu->ppt_funcs->baco_get_state)
 		return -EINVAL;
 
 	mutex_lock(&smu->mutex);
-- 
2.25.1