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Clear local variables in filters and functions.

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Fixes crash when used uninitialized variables.
This problem was surprisingly tricky to fix.
This commit is contained in:
Ondrej Zajicek 2010-03-19 09:41:18 +01:00
parent 74e9331fe0
commit aa46124804
3 changed files with 30 additions and 23 deletions
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9
filter/config.Y
View File

@ -172,7 +172,14 @@ function_params:
function_body:
decls '{' cmds '}' {
$$ = $3;
if ($1) {
/* Prepend instruction to clear local variables */
$$ = f_new_inst();
$$->code = P('c','v');
$$->a1.p = $1;
$$->next = $3;
} else
$$ = $3;
}
;

30
filter/filter.c
View File

@ -473,27 +473,10 @@ interpret(struct f_inst *what)
case 's':
ARG(v2, a2.p);
sym = what->a1.p;
switch (res.type = v2.type) {
case T_VOID: runtime( "Can't assign void values" );
case T_ENUM:
case T_BOOL:
case T_INT:
case T_PAIR:
case T_STRING:
case T_IP:
case T_PREFIX:
case T_PREFIX_SET:
case T_SET:
case T_PATH:
case T_PATH_MASK:
case T_CLIST:
if (sym->class != (SYM_VARIABLE | v2.type))
runtime( "Assigning to variable of incompatible type" );
* (struct f_val *) sym->def = v2;
break;
default:
bug( "Set to invalid type" );
}
if ((sym->class != (SYM_VARIABLE | v2.type)) &&
(v2.type != T_VOID))
runtime( "Assigning to variable of incompatible type" );
* (struct f_val *) sym->def = v2;
break;
/* some constants have value in a2, some in *a1.p, strange. */
@ -766,6 +749,10 @@ interpret(struct f_inst *what)
return res;
res.type &= ~T_RETURN;
break;
case P('c','v'): /* Clear local variables */
for (sym = what->a1.p; sym != NULL; sym = sym->aux2)
((struct f_val *) sym->def)->type = T_VOID;
break;
case P('S','W'):
ONEARG;
{
@ -948,6 +935,7 @@ i_same(struct f_inst *f1, struct f_inst *f2)
return 0;
f2->a2.p = f1->a2.p;
break;
case P('c','v'): break; /* internal instruction */
case P('S','W'): ONEARG; if (!same_tree(f1->a2.p, f2->a2.p)) return 0; break;
case P('i','M'): TWOARGS; break;
case P('A','p'): TWOARGS; break;

14
filter/test.conf
View File

@ -75,7 +75,7 @@ clist l;
p2 = prepend( p2, 1 );
print "Should be true: ", p2 ~ pm1, " ", p2, " ", pm1;
l = - empty -;
# l = - empty -;
l = add( l, (1,2) );
l = add( l, (2,3) );
print "Community list (1,2) (2,3) ", l;
@ -124,6 +124,14 @@ function test_pxset(prefix set pxs)
11.0.0.0/10 ~ pxs, ",", 20.1.0.0/26 ~ pxs;
}
function test_undef(int a)
int b;
{
if a = 3
then b = 4;
print "Defined: ", a, " ", b, " ", defined(b);
}
function __startup()
int i;
bool b;
@ -218,6 +226,10 @@ string s;
print "1.2.3.4 = ", onetwo;
test_undef(2);
test_undef(3);
test_undef(2);
print "done";
quitbird;
# print "*** FAIL: this is unreachable";