From: Victor Stinner <victor.stinner@gmail.com>
Date: Mon, 2 Jun 2014 19:40:22 +0000 (+0200)
Subject: Issue #21639: Fix a division by zero in tracemalloc on calloc(0, 0). The
X-Git-Tag: v3.5.0a1~1537
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=aa0e7afa438d7586353a3338fd350449714e117a;p=python

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.
---

aa0e7afa438d7586353a3338fd350449714e117a
diff --cc Modules/_tracemalloc.c
index 429b209c02,780e8eda82..1e454144de
--- a/Modules/_tracemalloc.c
+++ b/Modules/_tracemalloc.c
@@@ -478,12 -481,7 +478,12 @@@ tracemalloc_alloc(int use_calloc, void 
      PyMemAllocator *alloc = (PyMemAllocator *)ctx;
      void *ptr;
  
-     assert(nelem <= PY_SIZE_MAX / elsize);
 -    ptr = alloc->malloc(alloc->ctx, size);
++    assert(elsize == 0 || nelem <= PY_SIZE_MAX / elsize);
 +
 +    if (use_calloc)
 +        ptr = alloc->calloc(alloc->ctx, nelem, elsize);
 +    else
 +        ptr = alloc->malloc(alloc->ctx, nelem * elsize);
      if (ptr == NULL)
          return NULL;