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Check all Subtract implementations for overflow.

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This commit is contained in:
Dianne Skoll
2021-01-30 15:15:02 -05:00
parent 429a64f29e
commit 2123bf4b18
1 changed files with 6 additions and 0 deletions
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6
src/expr.c
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@@ -876,7 +876,9 @@ static int Subtract(void)
/* If it's a date minus an int, do subtraction, checking for underflow */
if (v1.type == DATE_TYPE && v2.type == INT_TYPE) {
int old = v1.v.val;
v1.v.val -= v2.v.val;
if (_private_sub_overflow(v1.v.val, v2.v.val, old)) return E_DATE_OVER;
if (v1.v.val < 0) return E_DATE_OVER;
PushValStack(v1);
return OK;
@@ -885,7 +887,9 @@ static int Subtract(void)
/* If it's a datetime minus an int or a time, do subtraction,
* checking for underflow */
if (v1.type == DATETIME_TYPE && (v2.type == INT_TYPE || v2.type == TIME_TYPE)) {
int old = v1.v.val;
v1.v.val -= v2.v.val;
if (_private_sub_overflow(v1.v.val, v2.v.val, old)) return E_DATE_OVER;
if (v1.v.val < 0) return E_DATE_OVER;
PushValStack(v1);
return OK;
@@ -903,7 +907,9 @@ static int Subtract(void)
if ((v1.type == TIME_TYPE && v2.type == TIME_TYPE) ||
(v1.type == DATETIME_TYPE && v2.type == DATETIME_TYPE) ||
(v1.type == DATE_TYPE && v2.type == DATE_TYPE)) {
int old = v1.v.val;
v1.v.val -= v2.v.val;
if (_private_sub_overflow(v1.v.val, v2.v.val, old)) return E_DATE_OVER;
v1.type = INT_TYPE;
PushValStack(v1);
return OK;