linux-kernel - [PATCH] [v2] drm/radeon/trinity_dpm: fix a memleak in trinity_parse_power

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Message-Id: <20231204102154.3309670-1-alexious@zju.edu.cn>
Date:   Mon,  4 Dec 2023 18:21:54 +0800
From:   Zhipeng Lu <alexious@....edu.cn>
To:     alexious@....edu.cn
Cc:     Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [v2] drm/radeon/trinity_dpm: fix a memleak in trinity_parse_power_table

The rdev->pm.dpm.ps allocated by kcalloc should be freed in every
following error-handling path. However, in the error-handling of
rdev->pm.power_state[i].clock_info the rdev->pm.dpm.ps is not freed,
resulting in a memleak in this function.

Fixes: d70229f70447 ("drm/radeon/kms: add dpm support for trinity asics")
Signed-off-by: Zhipeng Lu <alexious@....edu.cn>
---

Changelog:

v2: Adding {} to correct the if statement.
---
 drivers/gpu/drm/radeon/trinity_dpm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/radeon/trinity_dpm.c b/drivers/gpu/drm/radeon/trinity_dpm.c
index 08ea1c864cb2..ef1cc7bad20a 100644
--- a/drivers/gpu/drm/radeon/trinity_dpm.c
+++ b/drivers/gpu/drm/radeon/trinity_dpm.c
@@ -1726,8 +1726,10 @@ static int trinity_parse_power_table(struct radeon_device *rdev)
 		non_clock_array_index = power_state->v2.nonClockInfoIndex;
 		non_clock_info = (struct _ATOM_PPLIB_NONCLOCK_INFO *)
 			&non_clock_info_array->nonClockInfo[non_clock_array_index];
-		if (!rdev->pm.power_state[i].clock_info)
+		if (!rdev->pm.power_state[i].clock_info) {
+			kfree(rdev->pm.dpm.ps);
 			return -EINVAL;
+		}
 		ps = kzalloc(sizeof(struct sumo_ps), GFP_KERNEL);
 		if (ps == NULL) {
 			kfree(rdev->pm.dpm.ps);
-- 
2.34.1