commit 25ddbc44acfbe6d53439deb68e0f92b5809b5738
author Marijn Suijten <marijns95@gmail.com> Sat Sep 19 12:12:03 2020 +0200
committer Marijn Suijten <marijns95@gmail.com> Sat Sep 26 22:43:15 2020 +0200
tree b69a7251b93130e9108246d5a6772ee2b0dc502c
parent acdea8cf93b1e91e48fd1788c220e483310a53bd

drm_hwcomposer: Return error from GetEdidBlob if blob is null

drmModeGetPropertyBlob can return NULL blobs resulting in a segfault in
GetDisplayIdentificationData which expects blob to be set to a valid
pointer when GetEdidBlob returns 0.

Fixes: adc5d8229b9ce25f1bf0e4d02bb838eae62b89fc

Signed-off-by: Marijn Suijten <marijns95@gmail.com>

drm/DrmConnector.cpp

diff --git a/drm/DrmConnector.cpp b/drm/DrmConnector.cpp
index 0de0f91..f1b6c1b 100644
--- a/drm/DrmConnector.cpp
+++ b/drm/DrmConnector.cpp
@@ -103,7 +103,7 @@
   }
 
   blob = drmModeGetPropertyBlob(drm_->fd(), blob_id);
-  return 0;
+  return !blob;
 }
 
 uint32_t DrmConnector::id() const {