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hw: fix bug in IPC message-size calculation

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ref #989
This commit is contained in:
Martin Stein 2014-01-22 15:50:14 +01:00 committed by Norman Feske
parent a9747825fc
commit e68eadf57b
1 changed files with 8 additions and 10 deletions
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16
base-hw/include/base/native_types.h
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@ -193,24 +193,22 @@ class Genode::Message_tpl
* Install message that shall be send * Install message that shall be send
* *
* \param data base of payload * \param data base of payload
* \param raw_data_size size of payload without preceding name * \param data_size size of payload
* \param name local name that shall precede raw payload * \param name local name that shall be the first payload word
*/ */
void prepare_send(void * const data, size_t raw_data_size, void prepare_send(void * const data, size_t data_size,
unsigned const name) unsigned const name)
{ {
/* limit data size */ /* limit data size */
enum { NAME_SIZE = sizeof(name) };
size_t const data_size = raw_data_size + NAME_SIZE;
if (data_size > _max_data_size()) { if (data_size > _max_data_size()) {
Kernel::log() << "oversized message outgoing\n"; Kernel::log() << "oversized message outgoing\n";
raw_data_size = _max_data_size() - NAME_SIZE; data_size = _max_data_size();
} }
/* copy data */ /* copy data */
*(unsigned *)_data = name; *(unsigned *)_data = name;
void * const raw_data_dst = (void *)((addr_t)_data + NAME_SIZE); void * const data_dst = (void *)((addr_t)_data + sizeof(name));
void * const raw_data_src = (void *)((addr_t)data + NAME_SIZE); void * const data_src = (void *)((addr_t)data + sizeof(name));
memcpy(raw_data_dst, raw_data_src, raw_data_size); memcpy(data_dst, data_src, data_size - sizeof(name));
_data_size = data_size; _data_size = data_size;
} }