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* ext/dl/cptr.c (rb_dlptr_aref, rb_dlptr_aset): check NULL pointer

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dereference.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32720 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2011-07-28 03:32:52 +00:00
parent ad8ab9c013
commit eda13c7ee2
3 changed files with 21 additions and 6 deletions
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5
ChangeLog
View File

@ -1,4 +1,7 @@
Thu Jul 28 12:32:46 2011 Nobuyoshi Nakada <nobu@ruby-lang.org>
Thu Jul 28 12:32:49 2011 Nobuyoshi Nakada <nobu@ruby-lang.org>
* ext/dl/cptr.c (rb_dlptr_aref, rb_dlptr_aset): check NULL pointer
dereference.
* ext/dl/cptr.c (rb_dlptr_s_to_ptr): use rb_check_funcall.

16
ext/dl/cptr.c
View File

@ -502,16 +502,19 @@ rb_dlptr_aref(int argc, VALUE argv[], VALUE self)
VALUE arg0, arg1;
VALUE retval = Qnil;
size_t offset, len;
struct ptr_data *data;
TypedData_Get_Struct(self, struct ptr_data, &dlptr_data_type, data);
if (!data->ptr) rb_raise(rb_eDLError, "NULL pointer dereference");
switch( rb_scan_args(argc, argv, "11", &arg0, &arg1) ){
case 1:
offset = NUM2ULONG(arg0);
retval = INT2NUM(*((char*)RPTR_DATA(self)->ptr + offset));
retval = INT2NUM(*((char *)data->ptr + offset));
break;
case 2:
offset = NUM2ULONG(arg0);
len = NUM2ULONG(arg1);
retval = rb_tainted_str_new((char *)RPTR_DATA(self)->ptr + offset, len);
retval = rb_tainted_str_new((char *)data->ptr + offset, len);
break;
default:
rb_bug("rb_dlptr_aref()");
@ -535,17 +538,20 @@ rb_dlptr_aset(int argc, VALUE argv[], VALUE self)
VALUE retval = Qnil;
size_t offset, len;
void *mem;
struct ptr_data *data;
TypedData_Get_Struct(self, struct ptr_data, &dlptr_data_type, data);
if (!data->ptr) rb_raise(rb_eDLError, "NULL pointer dereference");
switch( rb_scan_args(argc, argv, "21", &arg0, &arg1, &arg2) ){
case 2:
offset = NUM2ULONG(arg0);
((char*)RPTR_DATA(self)->ptr)[offset] = NUM2UINT(arg1);
((char*)data->ptr)[offset] = NUM2UINT(arg1);
retval = arg1;
break;
case 3:
offset = NUM2ULONG(arg0);
len = NUM2ULONG(arg1);
if( TYPE(arg2) == T_STRING ){
if (RB_TYPE_P(arg2, T_STRING)) {
mem = StringValuePtr(arg2);
}
else if( rb_obj_is_kind_of(arg2, rb_cDLCPtr) ){
@ -554,7 +560,7 @@ rb_dlptr_aset(int argc, VALUE argv[], VALUE self)
else{
mem = NUM2PTR(arg2);
}
memcpy((char *)RPTR_DATA(self)->ptr + offset, mem, len);
memcpy((char *)data->ptr + offset, mem, len);
retval = arg2;
break;
default:

6
test/dl/test_cptr.rb
View File

@ -212,5 +212,11 @@ module DL
assert_equal ptr3.to_i, ptr[0,2] = ptr3.to_i
check.call(str, ptr)
end
def test_null_pointer
nullpo = CPtr.new(0)
assert_raise(DLError) {nullpo[0]}
assert_raise(DLError) {nullpo[0] = 1}
end
end
end