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Issue #10955: Fix a potential crash when trying to mmap() a file past its

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length.  Initial patch by Ross Lagerwall.

This fixes a regression introduced by r88022.
This commit is contained in:
Antoine Pitrou 2011-01-20 21:07:24 +00:00
parent 9ee94dec18
commit 305bc9e0e8
3 changed files with 27 additions and 0 deletions
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13
Lib/test/test_mmap.py
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@ -334,6 +334,19 @@ class MmapTests(unittest.TestCase):
with mmap.mmap(f.fileno(), 0, offset=65536, access=mmap.ACCESS_READ) as mf:
self.assertRaises(IndexError, mf.__getitem__, 80000)
def test_length_0_large_offset(self):
# Issue #10959: test mapping of a file by passing 0 for
# map length with a large offset doesn't cause a segfault.
if not hasattr(os, "stat"):
self.skipTest("needs os.stat")
with open(TESTFN, "wb") as f:
f.write(115699 * b'm') # Arbitrary character
with open(TESTFN, "w+b") as f:
self.assertRaises(ValueError, mmap.mmap, f.fileno(), 0,
offset=2147418112)
def test_move(self):
# make move works everywhere (64-bit format problem earlier)
f = open(TESTFN, 'wb+')