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Issue #1621: Fix undefined behaviour from signed overflow in datetime module hashes, array and list iterations, and get_integer (stringlib/string_format.h)

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Mark Dickinson 2011-09-25 15:34:32 +01:00
parent 50203a69b3
commit c7d93b7614
4 changed files with 14 additions and 16 deletions
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8
Modules/_datetimemodule.c
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@ -2746,13 +2746,13 @@ static Py_hash_t
generic_hash(unsigned char *data, int len)
{
register unsigned char *p;
register Py_hash_t x;
register Py_uhash_t x;
p = (unsigned char *) data;
x = *p << 7;
x = (Py_uhash_t)*p << 7;
while (--len >= 0)
x = (1000003*x) ^ *p++;
x ^= len;
x = (1000003U*x) ^ (Py_uhash_t)*p++;
x ^= (Py_uhash_t)len;
if (x == -1)
x = -2;