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Added runtime check for negative array indices in VM

Browse source 
https://forum.zdoom.org/viewtopic.php?t=57886
This commit is contained in:
alexey.lysiuk 2017-11-02 18:01:13 +02:00
parent 57de598e48
commit 81ea9fb372
2 changed files with 18 additions and 3 deletions
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15
src/scripting/vm/vmexec.h
View file

@ -899,6 +899,11 @@ static int Exec(VMFrameStack *stack, const VMOP *pc, VMReturn *ret, int numret)
ThrowAbortException(X_ARRAY_OUT_OF_BOUNDS, "Max.index = %u, current index = %u\n", BC, reg.d[a]);
return 0;
}
else if (reg.d[a] < 0)
{
ThrowAbortException(X_ARRAY_OUT_OF_BOUNDS, "Negative current index = %i\n", reg.d[a]);
return 0;
}
NEXTOP;
OP(BOUND_K):
@ -908,6 +913,11 @@ static int Exec(VMFrameStack *stack, const VMOP *pc, VMReturn *ret, int numret)
ThrowAbortException(X_ARRAY_OUT_OF_BOUNDS, "Max.index = %u, current index = %u\n", konstd[BC], reg.d[a]);
return 0;
}
else if (reg.d[a] < 0)
{
ThrowAbortException(X_ARRAY_OUT_OF_BOUNDS, "Negative current index = %i\n", reg.d[a]);
return 0;
}
NEXTOP;
OP(BOUND_R):
@ -917,6 +927,11 @@ static int Exec(VMFrameStack *stack, const VMOP *pc, VMReturn *ret, int numret)
ThrowAbortException(X_ARRAY_OUT_OF_BOUNDS, "Max.index = %u, current index = %u\n", reg.d[B], reg.d[a]);
return 0;
}
else if (reg.d[a] < 0)
{
ThrowAbortException(X_ARRAY_OUT_OF_BOUNDS, "Negative current index = %i\n", reg.d[a]);
return 0;
}
NEXTOP;
OP(CONCAT):

6
src/scripting/vm/vmops.h
View file

@ -122,9 +122,9 @@ xx(THROW, throw, THROW, NOP, 0, 0), // A == 0: Throw exception object pB
// A == 2: (pB == <type of exception thrown>) then pc++ ; next instruction must JMP to another CATCH
// A == 3: (pkB == <type of exception thrown>) then pc++ ; next instruction must JMP to another CATCH
// for A > 0, exception is stored in pC
xx(BOUND, bound, RII16, NOP, 0, 0), // if rA >= BC, throw exception
xx(BOUND_K, bound, LKI, NOP, 0, 0), // if rA >= const[BC], throw exception
xx(BOUND_R, bound, RIRI, NOP, 0, 0), // if rA >= rB, throw exception
xx(BOUND, bound, RII16, NOP, 0, 0), // if rA < 0 or rA >= BC, throw exception
xx(BOUND_K, bound, LKI, NOP, 0, 0), // if rA < 0 or rA >= const[BC], throw exception
xx(BOUND_R, bound, RIRI, NOP, 0, 0), // if rA < 0 or rA >= rB, throw exception
// String instructions.
xx(CONCAT, concat, RSRSRS, NOP, 0, 0), // sA = sB..sC