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vm: make sure we zero out the end of the bignums.

db4
John Benediktsson 2012-08-04 18:02:27 -07:00
parent 5ca6fb95a7
commit c4f85efc9d
1 changed files with 4 additions and 2 deletions
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6
vm/bignum.cpp
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@ -1837,7 +1837,7 @@ bignum * factor_vm::bignum_gcd(bignum * a, bignum * b)
if (k == 0) { if (k == 0) {
/* no progress; do a Euclidean step */ /* no progress; do a Euclidean step */
if (size_b == 0) { if (size_b == 0) {
return a; return bignum_trim (a);
} }
e = bignum_trim (a); e = bignum_trim (a);
GC_BIGNUM(e); GC_BIGNUM(e);
@ -1852,17 +1852,19 @@ bignum * factor_vm::bignum_gcd(bignum * a, bignum * b)
// copy 'b' to 'a' // copy 'b' to 'a'
scan_a = BIGNUM_START_PTR (a); scan_a = BIGNUM_START_PTR (a);
scan_b = BIGNUM_START_PTR (b); scan_b = BIGNUM_START_PTR (b);
a_end = scan_a + size_a;
b_end = scan_b + size_b; b_end = scan_b + size_b;
while (scan_b < b_end) *(scan_a++) = *(scan_b++); while (scan_b < b_end) *(scan_a++) = *(scan_b++);
while (scan_a < a_end) *(scan_a++) = 0;
size_a = size_b; size_a = size_b;
// copy 'c' to 'b' // copy 'c' to 'b'
scan_b = BIGNUM_START_PTR (b); scan_b = BIGNUM_START_PTR (b);
scan_c = BIGNUM_START_PTR (c); scan_c = BIGNUM_START_PTR (c);
size_c = BIGNUM_LENGTH (c); size_c = BIGNUM_LENGTH (c);
BIGNUM_ASSERT (size_c <= size_b);
c_end = scan_c + size_c; c_end = scan_c + size_c;
while (scan_c < c_end) *(scan_b++) = *(scan_c++); while (scan_c < c_end) *(scan_b++) = *(scan_c++);
while (scan_b < b_end) *(scan_b++) = 0;
size_b = size_c; size_b = size_c;
continue; continue;