[PATCH v2] iwlwifi: mvm: Fix a memory leak in an error handling path in 'iwl_mvm_sar_get_wgds_table()'

We should free 'wgds.pointer' here as done a few lines above in another
error handling path.
It was allocated within 'acpi_evaluate_object()'.

Signed-off-by: Christophe JAILLET <redacted>
---
v2: rebase after 7fe90e0e3d60 ("iwlwifi: mvm: refactor geo init")


Moreovern a comment in '/drivers/acpi/acpica/utalloc.c' states that:
/* [...] Note: The caller should use acpi_os_free to free this
 * buffer created via ACPI_ALLOCATE_BUFFER.
 */

So, at the end of this function:
	out_free:
		kfree(wgds.pointer);
should maybe be:
	out_free:
		acpi_os_free(wgds.pointer);

If correct, several places should be fixed accordingly.
---
 drivers/net/wireless/intel/iwlwifi/mvm/fw.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
index 79e7a7a285dc..82863e9273eb 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c

@@ -1275,8 +1275,10 @@ static int iwl_mvm_sar_get_wgds_table(struct iwl_mvm *mvm)
 
 			entry = &wifi_pkg->package.elements[idx++];
 			if ((entry->type != ACPI_TYPE_INTEGER) ||
-			    (entry->integer.value > U8_MAX))
-				return -EINVAL;
+			    (entry->integer.value > U8_MAX)) {
+				ret = -EINVAL;
+				goto out_free;
+			}
 
 			mvm->geo_profiles[i].values[j] = entry->integer.value;
 		}

-- 
2.11.0

On Fri, 2017-07-14 at 12:06 +0200, Christophe JAILLET wrote:

We should free 'wgds.pointer' here as done a few lines above in another
error handling path.
It was allocated within 'acpi_evaluate_object()'.

Signed-off-by: Christophe JAILLET <redacted>
---
v2: rebase after 7fe90e0e3d60 ("iwlwifi: mvm: refactor geo init")

Thanks, Christophe!

I've pushed this to our internal tree and it will eventually reach the
mainline via our normal process.

Moreovern a comment in '/drivers/acpi/acpica/utalloc.c' states that:
/* [...] Note: The caller should use acpi_os_free to free this
 * buffer created via ACPI_ALLOCATE_BUFFER.
 */

So, at the end of this function:
	out_free:
		kfree(wgds.pointer);
should maybe be:
	out_free:
		acpi_os_free(wgds.pointer);

If correct, several places should be fixed accordingly.

Thanks for pointing out! I'm about to do some refactoring in this code
and I'll make sure I check the proper way to free the acpi buffer when
doing so.

--
Cheers,
Luca.