[Intel-gfx] [PATCH 1/2] 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.

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 | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
index 14ca5d3057a7..ce771f6c1a5a 100644
--- a/drivers/gpu/drm/i915/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/intel_hdcp.c
@@ -186,14 +186,18 @@ int intel_hdcp_auth_downstream(struct intel_digital_port *intel_dig_port,
 		return -ENOMEM;
 
 	ret = shim->read_ksv_fifo(intel_dig_port, num_downstream, ksv_fifo);
-	if (ret)
+	if (ret) {
+		kfree(ksv_fifo);
 		return ret;
+	}
 
 	/* Process V' values from the receiver */
 	for (i = 0; i < DRM_HDCP_V_PRIME_NUM_PARTS; i++) {
 		ret = shim->read_v_prime_part(intel_dig_port, i, &vprime);
-		if (ret)
+		if (ret) {
+			kfree(ksv_fifo);
 			return ret;
+		}
 		I915_WRITE(HDCP_SHA_V_PRIME(i), vprime);
 	}
 
@@ -222,8 +226,10 @@ int intel_hdcp_auth_downstream(struct intel_digital_port *intel_dig_port,
 			sha_text |= ksv[j] << ((sizeof(sha_text) - j - 1) * 8);
 
 		ret = intel_write_sha_text(dev_priv, sha_text);
-		if (ret < 0)
+		if (ret < 0) {
+			kfree(ksv_fifo);
 			return ret;
+		}
 
 		/* Programming guide writes this every 64 bytes */
 		sha_idx += sizeof(sha_text);
@@ -245,13 +251,18 @@ int intel_hdcp_auth_downstream(struct intel_digital_port *intel_dig_port,
 			continue;
 
 		ret = intel_write_sha_text(dev_priv, sha_text);
-		if (ret < 0)
+		if (ret < 0) {
+			kfree(ksv_fifo);
 			return ret;
+		}
+
 		sha_leftovers = 0;
 		sha_text = 0;
 		sha_idx += sizeof(sha_text);
 	}
 
+	kfree(ksv_fifo);
+
 	/*
 	 * We need to write BINFO/BSTATUS, and M0 now. Depending on how many
 	 * bytes are leftover from the last ksv, we might be able to fit them
-- 
2.9.3