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Prevent division/modulo by zero in scripts.

Browse source 
Integral/floating-point division/modulo by zero in C++ is undefined
behavior, so to prevent such cases in a script from crashing Bro,
they're now reported as an error (with script location information) and
the event handler in which it occurred returns immediately.
This commit is contained in:
Jon Siwek 2013-09-20 16:36:00 -05:00
parent 4e2e690bff
commit 1750e351c4
3 changed files with 82 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

43
src/Expr.cc
View file

@ -779,9 +779,48 @@ Val* BinaryExpr::Fold(Val* v1, Val* v2) const
case EXPR_SUB: DO_FOLD(-); break;
case EXPR_REMOVE_FROM: DO_FOLD(-); break;
case EXPR_TIMES: DO_FOLD(*); break;
case EXPR_DIVIDE: DO_FOLD(/); break;
case EXPR_DIVIDE:
{
if ( is_integral )
{
if ( i2 == 0 )
reporter->ExprRuntimeError(this, "division by zero");
i3 = i1 / i2;
}
else if ( is_unsigned )
{
if ( u2 == 0 )
reporter->ExprRuntimeError(this, "division by zero");
u3 = u1 / u2;
}
else
{
if ( d2 == 0 )
reporter->ExprRuntimeError(this, "division by zero");
d3 = d1 / d2;
}
}
break;
case EXPR_MOD:
{
if ( is_integral )
{
if ( i2 == 0 )
reporter->ExprRuntimeError(this, "modulo by zero");
i3 = i1 % i2;
}
else if ( is_unsigned )
{
if ( u2 == 0 )
reporter->ExprRuntimeError(this, "modulo by zero");
u3 = u1 % u2;
}
else
Internal("bad type in BinaryExpr::Fold");
}
break;
case EXPR_MOD: DO_INT_FOLD(%); break;
case EXPR_AND: DO_INT_FOLD(&&); break;
case EXPR_OR: DO_INT_FOLD(||); break;