Add protections against queueing a UsbRequest when the underlying UsbDeviceConnection is closed. Bug: 204584366 Test: CTS Verifier: USB Accessory Test & USB Device Test Test: No HWASan use-after-free reports with a test app Change-Id: Ia3a9b10349efc0236b1539c81465f479cb32e02b (cherry picked from commit 1691b54b1fda4239249a3871d2c17ed1ec753061) Merged-In: Ia3a9b10349efc0236b1539c81465f479cb32e02b
diff --git a/core/java/android/hardware/usb/UsbDeviceConnection.java b/core/java/android/hardware/usb/UsbDeviceConnection.java index 1c35cb6..5df8512 100644 --- a/core/java/android/hardware/usb/UsbDeviceConnection.java +++ b/core/java/android/hardware/usb/UsbDeviceConnection.java
@@ -108,6 +108,34 @@ } /** + * This is meant to be called by UsbRequest's queue() in order to synchronize on + * UsbDeviceConnection's mLock to prevent the connection being closed while queueing. + */ + /* package */ boolean queueRequest(UsbRequest request, ByteBuffer buffer, int length) { + synchronized (mLock) { + if (!isOpen()) { + return false; + } + + return request.queueIfConnectionOpen(buffer, length); + } + } + + /** + * This is meant to be called by UsbRequest's queue() in order to synchronize on + * UsbDeviceConnection's mLock to prevent the connection being closed while queueing. + */ + /* package */ boolean queueRequest(UsbRequest request, @Nullable ByteBuffer buffer) { + synchronized (mLock) { + if (!isOpen()) { + return false; + } + + return request.queueIfConnectionOpen(buffer); + } + } + + /** * Releases all system resources related to the device. * Once the object is closed it cannot be used again. * The client must call {@link UsbManager#openDevice} again
diff --git a/core/java/android/hardware/usb/UsbRequest.java b/core/java/android/hardware/usb/UsbRequest.java index d1c6465d..7cabd85 100644 --- a/core/java/android/hardware/usb/UsbRequest.java +++ b/core/java/android/hardware/usb/UsbRequest.java
@@ -113,11 +113,13 @@ * Releases all resources related to this request. */ public void close() { - if (mNativeContext != 0) { - mEndpoint = null; - mConnection = null; - native_close(); - mCloseGuard.close(); + synchronized (mLock) { + if (mNativeContext != 0) { + mEndpoint = null; + mConnection = null; + native_close(); + mCloseGuard.close(); + } } } @@ -191,10 +193,32 @@ */ @Deprecated public boolean queue(ByteBuffer buffer, int length) { + UsbDeviceConnection connection = mConnection; + if (connection == null) { + // The expected exception by CTS Verifier - USB Device test + throw new NullPointerException("invalid connection"); + } + + // Calling into the underlying UsbDeviceConnection to synchronize on its lock, to prevent + // the connection being closed while queueing. + return connection.queueRequest(this, buffer, length); + } + + /** + * This is meant to be called from UsbDeviceConnection after synchronizing using the lock over + * there, to prevent the connection being closed while queueing. + */ + /* package */ boolean queueIfConnectionOpen(ByteBuffer buffer, int length) { + UsbDeviceConnection connection = mConnection; + if (connection == null || !connection.isOpen()) { + // The expected exception by CTS Verifier - USB Device test + throw new NullPointerException("invalid connection"); + } + boolean out = (mEndpoint.getDirection() == UsbConstants.USB_DIR_OUT); boolean result; - if (mConnection.getContext().getApplicationInfo().targetSdkVersion < Build.VERSION_CODES.P + if (connection.getContext().getApplicationInfo().targetSdkVersion < Build.VERSION_CODES.P && length > MAX_USBFS_BUFFER_SIZE) { length = MAX_USBFS_BUFFER_SIZE; } @@ -243,6 +267,28 @@ * @return true if the queueing operation succeeded */ public boolean queue(@Nullable ByteBuffer buffer) { + UsbDeviceConnection connection = mConnection; + if (connection == null) { + // The expected exception by CTS Verifier - USB Device test + throw new IllegalStateException("invalid connection"); + } + + // Calling into the underlying UsbDeviceConnection to synchronize on its lock, to prevent + // the connection being closed while queueing. + return connection.queueRequest(this, buffer); + } + + /** + * This is meant to be called from UsbDeviceConnection after synchronizing using the lock over + * there, to prevent the connection being closed while queueing. + */ + /* package */ boolean queueIfConnectionOpen(@Nullable ByteBuffer buffer) { + UsbDeviceConnection connection = mConnection; + if (connection == null || !connection.isOpen()) { + // The expected exception by CTS Verifier - USB Device test + throw new IllegalStateException("invalid connection"); + } + // Request need to be initialized Preconditions.checkState(mNativeContext != 0, "request is not initialized"); @@ -260,7 +306,7 @@ mIsUsingNewQueue = true; wasQueued = native_queue(null, 0, 0); } else { - if (mConnection.getContext().getApplicationInfo().targetSdkVersion + if (connection.getContext().getApplicationInfo().targetSdkVersion < Build.VERSION_CODES.P) { // Can only send/receive MAX_USBFS_BUFFER_SIZE bytes at once Preconditions.checkArgumentInRange(buffer.remaining(), 0, MAX_USBFS_BUFFER_SIZE, @@ -363,11 +409,12 @@ * @return true if cancelling succeeded */ public boolean cancel() { - if (mConnection == null) { + UsbDeviceConnection connection = mConnection; + if (connection == null) { return false; } - return mConnection.cancelRequest(this); + return connection.cancelRequest(this); } /** @@ -382,7 +429,8 @@ * @return true if cancelling succeeded. */ /* package */ boolean cancelIfOpen() { - if (mNativeContext == 0 || (mConnection != null && !mConnection.isOpen())) { + UsbDeviceConnection connection = mConnection; + if (mNativeContext == 0 || (connection != null && !connection.isOpen())) { Log.w(TAG, "Detected attempt to cancel a request on a connection which isn't open"); return false;