Avoid segfaults if disconnect USB camera while preview.

BUG: 117575807
Test: manual test by disconnect USB camera while preview.

Change-Id: Ia74b03e7f2a672efd9e9dfd651b5894529daeeee

1 files changed, 5 insertions, 1 deletions

diff --git a/camera/device/3.4/default/ExternalCameraDeviceSession.cpp b/camera/device/3.4/default/ExternalCameraDeviceSession.cpp
index 28ca0f35..1b739149 100644
--- a/camera/device/3.4/default/ExternalCameraDeviceSession.cpp
+++ b/camera/device/3.4/default/ExternalCameraDeviceSession.cpp
@@ -1737,7 +1737,11 @@ bool ExternalCameraDeviceSession::OutputThread::threadLoop() {
     // TODO: see if we can save some computation by converting to YV12 here
     uint8_t* inData;
     size_t inDataSize;
-    req->frameIn->map(&inData, &inDataSize);
+    if (req->frameIn->map(&inData, &inDataSize) != 0) {
+        lk.unlock();
+        return onDeviceError("%s: V4L2 buffer map failed", __FUNCTION__);
+    }
+
     // TODO: in some special case maybe we can decode jpg directly to gralloc output?
     ATRACE_BEGIN("MJPGtoI420");
     int res = libyuv::MJPGToI420(