31 lines
873 B
Python
31 lines
873 B
Python
#
|
|
# The various methods of bufferobject.c (here buffer_subscript()) call
|
|
# get_buf() before calling potentially more Python code (here via
|
|
# PySlice_GetIndicesEx()). But get_buf() already returned a void*
|
|
# pointer. This void* pointer can become invalid if the object
|
|
# underlying the buffer is mutated (here a bytearray object).
|
|
#
|
|
# As usual, please keep in mind that the three "here" in the sentence
|
|
# above are only examples. Each can be changed easily and lead to
|
|
# another crasher.
|
|
#
|
|
# This crashes for me on Linux 32-bits with CPython 2.6 and 2.7
|
|
# with a segmentation fault.
|
|
#
|
|
|
|
|
|
class PseudoIndex(object):
|
|
def __index__(self):
|
|
for c in "foobar"*n:
|
|
a.append(c)
|
|
return n * 4
|
|
|
|
|
|
for n in range(1, 100000, 100):
|
|
a = bytearray("test"*n)
|
|
buf = buffer(a)
|
|
|
|
s = buf[:PseudoIndex():1]
|
|
#print repr(s)
|
|
#assert s == "test"*n
|