linux-kernel - [PATCH v2] drm/amdgpu: fix multiple memory leaks

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Date:   Wed, 18 Sep 2019 14:05:26 -0500
From:   Navid Emamdoost <navid.emamdoost@...il.com>
To:     Christian.Koenig@....com
Cc:     emamd001@....edu, smccaman@....edu, kjlu@....edu,
        Navid Emamdoost <navid.emamdoost@...il.com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Rex Zhu <Rex.Zhu@....com>,
        Sam Ravnborg <sam@...nborg.org>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] drm/amdgpu: fix multiple memory leaks

In acp_hw_init there are some allocations that needs to be released in
case of failure:

1- adev->acp.acp_genpd should be released if any allocation attemp for
adev->acp.acp_cell, adev->acp.acp_res or i2s_pdata fails.
2- all of those allocations should be released if pm_genpd_add_device
fails.

v2: moved the released into goto error handlings

Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c | 30 +++++++++++++++++--------
 1 file changed, 21 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
index eba42c752bca..c0db75b71859 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
@@ -184,7 +184,7 @@ static struct device *get_mfd_cell_dev(const char *device_name, int r)
  */
 static int acp_hw_init(void *handle)
 {
-	int r, i;
+	int r, i, ret;
 	uint64_t acp_base;
 	u32 val = 0;
 	u32 count = 0;
@@ -231,20 +231,21 @@ static int acp_hw_init(void *handle)
 	adev->acp.acp_cell = kcalloc(ACP_DEVS, sizeof(struct mfd_cell),
 							GFP_KERNEL);
 
-	if (adev->acp.acp_cell == NULL)
-		return -ENOMEM;
+	if (adev->acp.acp_cell == NULL) {
+		ret = -ENOMEM;
+		goto out1;
+	}
 
 	adev->acp.acp_res = kcalloc(5, sizeof(struct resource), GFP_KERNEL);
 	if (adev->acp.acp_res == NULL) {
-		kfree(adev->acp.acp_cell);
-		return -ENOMEM;
+		ret = -ENOMEM;
+		goto out2;
 	}
 
 	i2s_pdata = kcalloc(3, sizeof(struct i2s_platform_data), GFP_KERNEL);
 	if (i2s_pdata == NULL) {
-		kfree(adev->acp.acp_res);
-		kfree(adev->acp.acp_cell);
-		return -ENOMEM;
+		ret = -ENOMEM;
+		goto out3;
 	}
 
 	switch (adev->asic_type) {
@@ -348,7 +349,8 @@ static int acp_hw_init(void *handle)
 		r = pm_genpd_add_device(&adev->acp.acp_genpd->gpd, dev);
 		if (r) {
 			dev_err(dev, "Failed to add dev to genpd\n");
-			return r;
+			ret = r;
+			goto out4;
 		}
 	}
 
@@ -393,6 +395,16 @@ static int acp_hw_init(void *handle)
 	val &= ~ACP_SOFT_RESET__SoftResetAud_MASK;
 	cgs_write_register(adev->acp.cgs_device, mmACP_SOFT_RESET, val);
 	return 0;
+
+out4:
+	kfree(i2s_pdata);
+out3:
+	kfree(adev->acp.acp_res);
+out2:
+	kfree(adev->acp.acp_cell);
+out1:
+	kfree(adev->acp.acp_genpd);
+	return ret;
 }
 
 /**
-- 
2.17.1