diff --git a/driver/rsdAllocation.cpp b/driver/rsdAllocation.cpp
index da010b3..b41880a 100644
--- a/driver/rsdAllocation.cpp
+++ b/driver/rsdAllocation.cpp
@@ -286,8 +286,8 @@
     } else if (alloc->mHal.state.userProvidedPtr != NULL) {
         // user-provided allocation
         // limitations: no faces, no LOD, USAGE_SCRIPT only
-        if (alloc->mHal.state.usageFlags != RS_ALLOCATION_USAGE_SCRIPT) {
-            ALOGE("Can't use user-allocated buffers if usage is not USAGE_SCRIPT");
+        if (alloc->mHal.state.usageFlags != (RS_ALLOCATION_USAGE_SCRIPT | RS_ALLOCATION_USAGE_SHARED)) {
+            ALOGE("Can't use user-allocated buffers if usage is not USAGE_SCRIPT and USAGE_SHARED");
             return false;
         }
         if (alloc->getType()->getDimLOD() || alloc->getType()->getDimFaces()) {
@@ -358,7 +358,7 @@
 
     if (alloc->mHal.drvState.lod[0].mallocPtr) {
         // don't free user-allocated ptrs
-        if (!alloc->mHal.state.userProvidedPtr) {
+        if (!(alloc->mHal.state.usageFlags & RS_ALLOCATION_USAGE_SHARED)) {
             free(alloc->mHal.drvState.lod[0].mallocPtr);
         }
         alloc->mHal.drvState.lod[0].mallocPtr = NULL;
@@ -373,6 +373,11 @@
 
 void rsdAllocationResize(const Context *rsc, const Allocation *alloc,
                          const Type *newType, bool zeroNew) {
+    // can't resize Allocations with user-allocated buffers
+    if (alloc->mHal.state.usageFlags & RS_ALLOCATION_USAGE_SHARED) {
+        ALOGE("Resize cannot be called on a USAGE_SHARED allocation");
+        return;
+    }
     void * oldPtr = alloc->mHal.drvState.lod[0].mallocPtr;
     // Calculate the object size
     size_t s = AllocationBuildPointerTable(rsc, alloc, newType, NULL);
diff --git a/rsDefines.h b/rsDefines.h
index 8900c13..b1f1041 100644
--- a/rsDefines.h
+++ b/rsDefines.h
@@ -106,6 +106,7 @@
     RS_ALLOCATION_USAGE_GRAPHICS_RENDER_TARGET = 0x0010,
     RS_ALLOCATION_USAGE_IO_INPUT = 0x0020,
     RS_ALLOCATION_USAGE_IO_OUTPUT = 0x0040,
+    RS_ALLOCATION_USAGE_SHARED = 0x0080,
 
     RS_ALLOCATION_USAGE_ALL = 0x00FF
 };