Issue #21639: Fix a division by zero in tracemalloc on calloc(0, 0). The

regression was introduced recently with the introduction of the new "calloc"
functions (PyMem_RawCalloc, PyMem_Calloc, PyObject_Calloc).

Add also a unit test to check for the non-regression.

1 files changed, 1 insertions, 1 deletions

diff --git a/Modules/_tracemalloc.c b/Modules/_tracemalloc.c
index 429b209c02..1e454144de 100644
--- a/Modules/_tracemalloc.c
+++ b/Modules/_tracemalloc.c
@@ -478,7 +478,7 @@ tracemalloc_alloc(int use_calloc, void *ctx, size_t nelem, size_t elsize)
     PyMemAllocator *alloc = (PyMemAllocator *)ctx;
     void *ptr;
 
-    assert(nelem <= PY_SIZE_MAX / elsize);
+    assert(elsize == 0 || nelem <= PY_SIZE_MAX / elsize);
 
     if (use_calloc)
         ptr = alloc->calloc(alloc->ctx, nelem, elsize);