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

[Srivatsa, Anusha]

Earlier, I responded to the wrong version of the patch :(
Apologies.

>-----Original Message-----
>From: Sripada, Radhakrishna
>Sent: Wednesday, April 4, 2018 4:00 PM
>To: intel-gfx at lists.freedesktop.org
>Cc: Sripada, Radhakrishna <radhakrishna.sripada at intel.com>; Jani Nikula
><jani.nikula at linux.intel.com>; Srivatsa, Anusha <anusha.srivatsa at intel.com>
>Subject: [PATCH v2] drm/i915: Fix memory leak in intel_hdcp auth
>
>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>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa 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