Re: [PATCH v3] drm/amdgpu: fix multiple memory leaks in acp_hw_init

Am 30.09.19 um 23:26 schrieb Navid Emamdoost:

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 mfd_add_hotplug_devices or pm_genpd_add_device fail. 3- Release is needed in case of time out values expire.

Signed-off-by: Navid Emamdoost navid.emamdoost@gmail.com

Changes in v2: -- moved the releases under goto

Changes in v3: -- fixed multiple goto issue -- added goto for 3 other failure cases: one when mfd_add_hotplug_devices fails, and two when time out values expires.

---

drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c | 41 ++++++++++++++++--------- 1 file changed, 27 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c index eba42c752bca..7809745ec0f1 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c @@ -184,12 +184,12 @@ 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;

Please don't add another "ret" variable, instead always use "r" here.

Apart from that looks good to me, Christian.

uint64_t acp_base; u32 val = 0; u32 count = 0; struct device *dev;

• struct i2s_platform_data *i2s_pdata;

• struct i2s_platform_data *i2s_pdata = NULL;

  struct amdgpu_device *adev = (struct amdgpu_device *)handle;

@@ -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 failure;
  

• }

  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 failure;
  

  }

  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 failure;
  

  }

  switch (adev->asic_type) {

@@ -340,15 +341,18 @@ static int acp_hw_init(void *handle)

r = mfd_add_hotplug_devices(adev->acp.parent, adev->acp.acp_cell, ACP_DEVS);

• if (r)

• return r;
  

• if (r) {

• ret = r;
  

• goto failure;
  

• }

  for (i = 0; i < ACP_DEVS ; i++) { dev = get_mfd_cell_dev(adev->acp.acp_cell[i].name, i); 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 failure;
  

  } }

@@ -367,7 +371,8 @@ static int acp_hw_init(void *handle) break; if (--count == 0) { dev_err(&adev->pdev->dev, "Failed to reset ACP\n");

• 	return -ETIMEDOUT;
  

• 	ret = -ETIMEDOUT;
  

• 	goto failure;
  

  } udelay(100); }

@@ -384,7 +389,8 @@ static int acp_hw_init(void *handle) break; if (--count == 0) { dev_err(&adev->pdev->dev, "Failed to reset ACP\n");

• 	return -ETIMEDOUT;
  

• 	ret = -ETIMEDOUT;
  

• 	goto failure;
  

  } udelay(100); }

@@ -393,6 +399,13 @@ 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;

+failure:

• kfree(i2s_pdata);

• kfree(adev->acp.acp_res);

• kfree(adev->acp.acp_cell);

• kfree(adev->acp.acp_genpd);

• return ret; }

  /**