ui: Fix bad size check in Fence::unflatten

Differs slightly from mnc+ patch: GetFlattenedSize was fixed in mnc.

Test: Boot device, run poc from bug, observe no longer crashes
Bug: 37285689
Change-Id: Id8b851733b088cce0d07493fbf76e7e24f9299ad

diff --git a/libs/ui/Fence.cpp b/libs/ui/Fence.cpp
index 93ec0ce..2a77150 100644 (file)
--- a/libs/ui/Fence.cpp
+++ b/libs/ui/Fence.cpp
@@ -127,7 +127,7 @@ nsecs_t Fence::getSignalTime() const {
 }
 
 size_t Fence::getFlattenedSize() const {
-    return 1;
+    return 4;
 }
 
 size_t Fence::getFdCount() const {
@@ -152,7 +152,7 @@ status_t Fence::unflatten(void const*& buffer, size_t& size, int const*& fds, si
         return INVALID_OPERATION;
     }
 
-    if (size < 1) {
+    if (size < getFlattenedSize()) {
         return NO_MEMORY;
     }