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| author | Sergey Fedoseev <fedoseev.sergey@gmail.com> | 2018-09-11 23:18:01 (GMT) |
|---|---|---|
| committer | Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> | 2018-09-11 23:18:01 (GMT) |
| commit | 6c7d67ce83a62b5f0fe5c53a6df602827451bf7f (patch) | |
| tree | 124db646c91085418871cb49a645c96c700503d9 /Objects/setobject.c | |
| parent | 4859ba0d2ce4506fddc3f55f90f8dce031b3804f (diff) | |
| download | cpython-6c7d67ce83a62b5f0fe5c53a6df602827451bf7f.zip cpython-6c7d67ce83a62b5f0fe5c53a6df602827451bf7f.tar.gz cpython-6c7d67ce83a62b5f0fe5c53a6df602827451bf7f.tar.bz2 | |
bpo-1621: Avoid signed integer overflow in set_table_resize(). (GH-9059)
Address a C undefined behavior signed integer overflow issue in set object table resizing. Our -fwrapv compiler flag and practical reasons why sets are unlikely to get this large should mean this was never an issue but it was incorrect code that generates code analysis warnings.
<!-- issue-number: [bpo-1621](https://www.bugs.python.org/issue1621) -->
https://bugs.python.org/issue1621
<!-- /issue-number -->
Diffstat (limited to 'Objects/setobject.c')
| -rw-r--r-- | Objects/setobject.c | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/Objects/setobject.c b/Objects/setobject.c index 82b5838..e7a5288 100644 --- a/Objects/setobject.c +++ b/Objects/setobject.c @@ -302,7 +302,6 @@ actually be smaller than the old one. static int set_table_resize(PySetObject *so, Py_ssize_t minused) { - Py_ssize_t newsize; setentry *oldtable, *newtable, *entry; Py_ssize_t oldmask = so->mask; size_t newmask; @@ -313,13 +312,9 @@ set_table_resize(PySetObject *so, Py_ssize_t minused) /* Find the smallest table size > minused. */ /* XXX speed-up with intrinsics */ - for (newsize = PySet_MINSIZE; - newsize <= minused && newsize > 0; - newsize <<= 1) - ; - if (newsize <= 0) { - PyErr_NoMemory(); - return -1; + size_t newsize = PySet_MINSIZE; + while (newsize <= (size_t)minused) { + newsize <<= 1; // The largest possible value is PY_SSIZE_T_MAX + 1. } /* Get space for a new table. */ |