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sd-bus: properly match ID changes

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If the caller does not specify arg1 for NameOwnerChanged matches, we
really must take the ID from arg2 or arg3, if provided. They are
guaranteed to be identical to arg1 if either is supplied, but there is no
strict requiredment that arg1 is supplied. Hence, make sure to always
take the more restrictive match. Otherwise, we install rather wide
matches without anyone requiring them.
This commit is contained in:
David Herrmann
2015-07-16 14:37:08 +02:00
parent 1af5f746d5
commit 1845880757
1 changed files with 4 additions and 0 deletions
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4
src/libsystemd/sd-bus/bus-control.c
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@@ -1187,6 +1187,8 @@ static int add_name_change_match(sd_bus *bus,
* match against added ids */
if (!old_owner || old_owner[0] == 0) {
item->type = KDBUS_ITEM_ID_ADD;
if (!isempty(new_owner))
item->id_change.id = new_owner_id;
r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
if (r < 0)
@@ -1197,6 +1199,8 @@ static int add_name_change_match(sd_bus *bus,
* match against removed ids */
if (!new_owner || new_owner[0] == 0) {
item->type = KDBUS_ITEM_ID_REMOVE;
if (!isempty(old_owner))
item->id_change.id = old_owner_id;
r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
if (r < 0)