[4.9,49/66] drm/i915: Dont leak edid in intel_crt_detect_ddc()

Commit Message

Greg KH Jan. 31, 2017, 5:36 a.m. UTC

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ander Conselvan de Oliveira <[e-mail]>

commit c34f078675f505c4437919bb1897b1351f16a050 upstream.

In the path where intel_crt_detect_ddc() detects a CRT, if would return
true without freeing the edid.

Fixes: a2bd1f541f19 ("drm/i915: check whether we actually received an edid in detect_ddc")
Cc: Chris Wilson <[e-mail]>
Cc: Daniel Vetter <[e-mail]>
Cc: Daniel Vetter <[e-mail]>
Cc: Jani Nikula <[e-mail]>
Cc: [e-mail]
Signed-off-by: Ander Conselvan de Oliveira <[e-mail]>
Reviewed-by: Ville Syrjälä <[e-mail]>
Reviewed-by: Jani Nikula <[e-mail]>
Link: http://patchwork.freedesktop.org/patch/msgid/[e-mail]
(cherry picked from commit c96b63a6a7ac4bd670ec2e663793a9a31418b790)
Signed-off-by: Jani Nikula <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

---
 drivers/gpu/drm/i915/intel_crt.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

Patch

--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -499,6 +499,7 @@  static bool intel_crt_detect_ddc(struct
 	struct drm_i915_private *dev_priv = to_i915(crt->base.base.dev);
 	struct edid *edid;
 	struct i2c_adapter *i2c;
+	bool ret = false;
 
 	BUG_ON(crt->base.type != INTEL_OUTPUT_ANALOG);
 
@@ -515,17 +516,17 @@  static bool intel_crt_detect_ddc(struct
 		 */
 		if (!is_digital) {
 			DRM_DEBUG_KMS("CRT detected via DDC:0x50 [EDID]\n");
-			return true;
+			ret = true;
+		} else {
+			DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [EDID reports a digital panel]\n");
 		}
-
-		DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [EDID reports a digital panel]\n");
 	} else {
 		DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [no valid EDID found]\n");
 	}
 
 	kfree(edid);
 
-	return false;
+	return ret;
 }
 
 static enum drm_connector_status