Deloitte LinkedIn Header: Fix a possible UAF in {LZMA,BZ2,_Zlib}Decompressor (Back To School Post Ideas

Product Launch Presentation Templates) Fix dangling input pointer after `MemoryError` in _lzma/_bz2/_ZlibDecompressor.decompress

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@@ -0,0 +1,5 @@
+Fix a dangling input pointer in :class:`lzma.LZMADecompressor`,
+:class:`bz2.BZ2Decompressor`, and internal :class:`!zlib._ZlibDecompressor`
+when memory allocation fails with :exc:`MemoryError`, which could let a
+subsequent :meth:`!decompress` call read or write through a stale pointer to
+the already-released caller buffer.

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@@ -571,6 +571,7 @@ decompress(BZ2Decompressor *d, char *data, size_t len, Py_ssize_t max_length)
  return result;
 
 error:
+ bzs->next_in = NULL;
  Py_XDECREF(result);
  return NULL;
 }

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@@ -1100,6 +1100,7 @@ decompress(Decompressor *d, uint8_t *data, size_t len, Py_ssize_t max_length)
  return result;
 
 error:
+ lzs->next_in = NULL;
  Py_XDECREF(result);
  return NULL;
 }

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@@ -1669,6 +1669,7 @@ decompress(ZlibDecompressor *self, uint8_t *data,
  return result;
 
 error:
+ self->zst.next_in = NULL;
  Py_XDECREF(result);
  return NULL;
 }