Add dimension check in ssd_random_crop (#5240)

ssd_random_crop wasn't checking dimensions of bboxes argument, leading to out of bounds memory accesses. In this PR I add this check and adjust an invalid checkpointing test.

Signed-off-by: Szymon Karpiński <skarpinski@nvidia.com>
Co-authored-by: Michał Zientkiewicz <mzient@gmail.com>

dali/operators/ssd/random_crop.cc

@@ -186,6 +186,9 @@ void SSDRandomCrop<CPUBackend>::RunImpl(SampleWorkspace &ws) {
   int sample = ws.data_idx();
 
   auto N = bboxes.dim(0);
+  DALI_ENFORCE(bboxes.ndim() == 2 && bboxes.dim(1) == 4,
+               "The second dimension of the bounding box tensor should be 4.");
+
   const float* bbox_data = bboxes.data<float>();
 
   const int* label_data = labels.data<int>();

dali/test/python/checkpointing/test_dali_checkpointing.py

@@ -1021,7 +1021,7 @@ def test_ssd_random_crop():
     @pipeline_def
     def pipeline():
         data = fn.random.uniform(shape=(100, 100), dtype=types.DALIDataType.UINT8)
-        bbox = fn.random.uniform(shape=(4,), range=[0, 100], dtype=types.DALIDataType.FLOAT)
+        bbox = fn.random.uniform(shape=(7, 4), range=[0, 100], dtype=types.DALIDataType.FLOAT)
         labels = fn.random.uniform(shape=(1,), dtype=types.DALIDataType.INT32)
         return fn.ssd_random_crop(data, bbox, labels, device="cpu")[0]