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Merge branch 'PHP-7.2'

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* PHP-7.2:
  Fixed bug #54598 (bcpowmod() may return 1 if modulus is 1)
This commit is contained in:
Christoph M. Becker
2017-09-07 00:44:47 +02:00
parent f70d14e407 d01453b129
commit d254a2cbca
2 changed files with 31 additions and 8 deletions
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ext/bcmath/libbcmath/src/raisemod.c
+15 -8
View File
@@ -75,17 +75,24 @@ bc_raisemod (bc_num base, bc_num expo, bc_num mod, bc_num *result, int scale)
/* Do the calculation. */
rscale = MAX(scale, base->n_scale);
while ( !bc_is_zero(exponent) )
if ( !bc_compare(mod, BCG(_one_)) )
{
(void) bc_divmod (exponent, BCG(_two_), &exponent, &parity, 0);
if ( !bc_is_zero(parity) )
temp = bc_new_num (1, scale);
}
else
{
while ( !bc_is_zero(exponent) )
{
bc_multiply (temp, power, &temp, rscale);
(void) bc_modulo (temp, mod, &temp, scale);
}
(void) bc_divmod (exponent, BCG(_two_), &exponent, &parity, 0);
if ( !bc_is_zero(parity) )
{
bc_multiply (temp, power, &temp, rscale);
(void) bc_modulo (temp, mod, &temp, scale);
}
bc_multiply (power, power, &power, rscale);
(void) bc_modulo (power, mod, &power, scale);
bc_multiply (power, power, &power, rscale);
(void) bc_modulo (power, mod, &power, scale);
}
}
/* Assign the value. */
ext/bcmath/tests/bug54598.phpt
+16
View File
@@ -0,0 +1,16 @@
--TEST--
Bug #54598 (bcpowmod() may return 1 if modulus is 1)
--SKIPIF--
<?php
if (!extension_loaded('bcmath')) die('skip bcmath extension is not available');
?>
--FILE--
<?php
var_dump(bcpowmod(5, 0, 1));
var_dump(bcpowmod(5, 0, 1, 3));
?>
===DONE===
--EXPECT--
string(1) "0"
string(5) "0.000"
===DONE===