mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-10-09 08:31:26 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 13

Issue #1621: Fix undefined behaviour in bytes.__hash__, str.__hash__, tuple.__hash__, frozenset.__hash__ and set indexing operations.

Browse source
This commit is contained in:
Mark Dickinson 2011-09-24 18:18:40 +01:00
parent 0390151100
commit 57e683e53e
5 changed files with 26 additions and 25 deletions
Download patch file Download diff file Expand all files Collapse all files

8
Objects/bytesobject.c
View file

@ -869,16 +869,16 @@ bytes_hash(PyBytesObject *a)
{
register Py_ssize_t len;
register unsigned char *p;
register Py_hash_t x;
register Py_uhash_t x;
if (a->ob_shash != -1)
return a->ob_shash;
len = Py_SIZE(a);
p = (unsigned char *) a->ob_sval;
x = *p << 7;
x = (Py_uhash_t)*p << 7;
while (--len >= 0)
x = (1000003*x) ^ *p++;
x ^= Py_SIZE(a);
x = (1000003U*x) ^ (Py_uhash_t)*p++;
x ^= (Py_uhash_t)Py_SIZE(a);
if (x == -1)
x = -2;
a->ob_shash = x;