Issue #10916: mmap should not segfault when a file is mapped using 0 as
length and a non-zero offset, and an attempt to read past the end of file
is made (IndexError is raised instead). Patch by Ross Lagerwall.
Requested by Georg.
diff --git a/Lib/test/test_mmap.py b/Lib/test/test_mmap.py
index abfde01..c7b8d60 100644
--- a/Lib/test/test_mmap.py
+++ b/Lib/test/test_mmap.py
@@ -320,6 +320,19 @@
mf.close()
f.close()
+ def test_length_0_offset(self):
+ # Issue #10916: test mapping of remainder of file by passing 0 for
+ # map length with an offset doesn't cause a segfault.
+ if not hasattr(os, "stat"):
+ self.skipTest("needs os.stat")
+ with open(TESTFN, "wb+") as f:
+ f.write(49152 * b'm') # Arbitrary character
+
+ with open(TESTFN, "rb") as f:
+ mf = mmap.mmap(f.fileno(), 0, offset=40960, access=mmap.ACCESS_READ)
+ self.assertRaises(IndexError, mf.__getitem__, 45000)
+ mf.close()
+
def test_move(self):
# make move works everywhere (64-bit format problem earlier)
f = open(TESTFN, 'wb+')