diff --git a/src/sys/lockctl.c b/src/sys/lockctl.c
index d99e040d..c4f2ef4e 100644
--- a/src/sys/lockctl.c
+++ b/src/sys/lockctl.c
@@ -52,7 +52,7 @@ static NTSTATUS FspFsvolLockControlRetry(
     /* perform oplock check; we are only implementing Win7 behavior */
     Result = FspCheckOplock(FspFileNodeAddrOfOplock(FileNode), Irp,
         (PVOID)(UINT_PTR)FspFsvolLockControlRetry, FspWqOplockComplete, FspWqOplockPrepare);
-    if (STATUS_PENDING == Result)
+    if (!NT_SUCCESS(Result) || STATUS_PENDING == Result)
     {
         FspFileNodeRelease(FileNode, Main);
         return Result;
diff --git a/src/sys/read.c b/src/sys/read.c
index 6dce513c..8162c0f1 100644
--- a/src/sys/read.c
+++ b/src/sys/read.c
@@ -119,7 +119,7 @@ static NTSTATUS FspFsvolReadCached(
     /* perform oplock check */
     Result = FspCheckOplock(FspFileNodeAddrOfOplock(FileNode), Irp,
         (PVOID)(UINT_PTR)FspFsvolReadCached, FspWqOplockComplete, FspWqOplockPrepare);
-    if (STATUS_PENDING == Result)
+    if (!NT_SUCCESS(Result) || STATUS_PENDING == Result)
     {
         FspFileNodeRelease(FileNode, Main);
         return Result;
@@ -250,7 +250,7 @@ static NTSTATUS FspFsvolReadNonCached(
     {
         Result = FspCheckOplock(FspFileNodeAddrOfOplock(FileNode), Irp,
             (PVOID)(UINT_PTR)FspFsvolReadNonCached, FspWqOplockComplete, FspWqOplockPrepare);
-        if (STATUS_PENDING == Result)
+        if (!NT_SUCCESS(Result) || STATUS_PENDING == Result)
         {
             FspFileNodeRelease(FileNode, Full);
             return Result;
diff --git a/src/sys/write.c b/src/sys/write.c
index b66b132b..50a557ac 100644
--- a/src/sys/write.c
+++ b/src/sys/write.c
@@ -143,7 +143,7 @@ static NTSTATUS FspFsvolWriteCached(
     /* perform oplock check */
     Result = FspCheckOplock(FspFileNodeAddrOfOplock(FileNode), Irp,
         (PVOID)(UINT_PTR)FspFsvolWriteCached, FspWqOplockComplete, FspWqOplockPrepare);
-    if (STATUS_PENDING == Result)
+    if (!NT_SUCCESS(Result) || STATUS_PENDING == Result)
     {
         FspFileNodeRelease(FileNode, Main);
         return Result;
@@ -320,7 +320,7 @@ static NTSTATUS FspFsvolWriteNonCached(
     {
         Result = FspCheckOplock(FspFileNodeAddrOfOplock(FileNode), Irp,
             (PVOID)(UINT_PTR)FspFsvolWriteNonCached, FspWqOplockComplete, FspWqOplockPrepare);
-        if (STATUS_PENDING == Result)
+        if (!NT_SUCCESS(Result) || STATUS_PENDING == Result)
         {
             FspFileNodeRelease(FileNode, Full);
             return Result;