[PATCH v2] drm/i915: Fix memory leak in intel_hdcp auth

[Radhakrishna Sripada]

Static code analysis tool reported memory leak in
intel_hdcp_auth_downstream. Fixing the memory leak.

v2: Rebase, move free to a cleanup label(Jani)

Cc: Jani Nikula <jani.nikula at linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa at intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
---
 drivers/gpu/drm/i915/intel_hdcp.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
index 98a9c81e2dc1..2db5da550a1c 100644
--- a/drivers/gpu/drm/i915/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/intel_hdcp.c
@@ -435,7 +435,7 @@ int intel_hdcp_auth_downstream(struct intel_digital_port *intel_dig_port,
 
 	ret = shim->read_ksv_fifo(intel_dig_port, num_downstream, ksv_fifo);
 	if (ret)
-		return ret;
+		goto err;
 
 	/*
 	 * When V prime mismatches, DP Spec mandates re-read of
@@ -451,12 +451,15 @@ int intel_hdcp_auth_downstream(struct intel_digital_port *intel_dig_port,
 
 	if (i == tries) {
 		DRM_ERROR("V Prime validation failed.(%d)\n", ret);
-		return ret;
+		goto err;
 	}
 
 	DRM_DEBUG_KMS("HDCP is enabled (%d downstream devices)\n",
 		      num_downstream);
-	return 0;
+	ret = 0;
+err:
+	kfree(ksv_fifo);
+	return ret;
 }
 
 /* Implements Part 1 of the HDCP authorization procedure */
-- 
2.9.3