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srbchannel: Defer reading when setting up read callback

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Calling the callback while setting it up can make things
complicated for clients, as the callback can do arbitrarily
things.

In this case, a protocol error caused the srbchannel to be
owned by both the pstream and the native connection.

Now the read callback is deferred, making sure the callback
is called from a cleaner context where errors are handled
appropriately.

Reported-by: Tanu Kaskinen <tanu.kaskinen@linux.intel.com>
Signed-off-by: David Henningsson <david.henningsson@canonical.com>
This commit is contained in:
David Henningsson 2014-09-17 08:56:51 +02:00
parent f8aa823998
commit e521d38787
2 changed files with 21 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

24
src/pulsecore/srbchannel.c
View file

@ -86,6 +86,7 @@ struct pa_srbchannel {
pa_srbchannel_cb_t callback;
pa_io_event *read_event;
pa_defer_event *defer_event;
pa_mainloop_api *mainloop;
};
@ -211,6 +212,17 @@ static void semread_cb(pa_mainloop_api *m, pa_io_event *e, int fd, pa_io_event_f
srbchannel_rwloop(sr);
}
static void defer_cb(pa_mainloop_api *m, pa_defer_event *e, void *userdata) {
pa_srbchannel* sr = userdata;
#ifdef DEBUG_SRBCHANNEL
pa_log("Calling rw loop from deferred event");
#endif
m->defer_enable(e, 0);
srbchannel_rwloop(sr);
}
pa_srbchannel* pa_srbchannel_new(pa_mainloop_api *m, pa_mempool *p) {
int capacity;
int readfd;
@ -331,9 +343,13 @@ void pa_srbchannel_set_callback(pa_srbchannel *sr, pa_srbchannel_cb_t callback,
sr->callback = callback;
sr->cb_userdata = userdata;
if (sr->callback)
/* Maybe deferred event? */
srbchannel_rwloop(sr);
if (sr->callback) {
/* If there are events to be read already in the ringbuffer, we will not get any IO event for that,
because that's how pa_fdsem works. Therefore check the ringbuffer in a defer event instead. */
if (!sr->defer_event)
sr->defer_event = sr->mainloop->defer_new(sr->mainloop, defer_cb, sr);
sr->mainloop->defer_enable(sr->defer_event, 1);
}
}
void pa_srbchannel_free(pa_srbchannel *sr)
@ -343,6 +359,8 @@ void pa_srbchannel_free(pa_srbchannel *sr)
#endif
pa_assert(sr);
if (sr->defer_event)
sr->mainloop->defer_free(sr->defer_event);
if (sr->read_event)
sr->mainloop->io_free(sr->read_event);

3
src/pulsecore/srbchannel.h
View file

@ -52,9 +52,6 @@ size_t pa_srbchannel_read(pa_srbchannel *sr, void *data, size_t l);
*
* Return false to abort all processing (e g if the srbchannel has been freed during the callback).
* Otherwise return true.
*
* Note that the callback will be called immediately, to be able to process stuff that
* might already be in the buffer.
*/
typedef bool (*pa_srbchannel_cb_t)(pa_srbchannel *sr, void *userdata);
void pa_srbchannel_set_callback(pa_srbchannel *sr, pa_srbchannel_cb_t callback, void *userdata);