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| author | Samuel Mendoza-Jonas <sam@mendozajonas.com> | 2016-09-01 14:32:03 +1000 |
|---|---|---|
| committer | Samuel Mendoza-Jonas <sam@mendozajonas.com> | 2016-09-01 14:59:05 +1000 |
| commit | a50d5fe279db71cf85fabeb675c99b167ec63dcb (patch) | |
| tree | 2f7058badc87b030053ecb63c7312c3894ccf02c | |
| parent | ccb478ac2e5b1e24ebb6af4130fdd37e1b36babb (diff) | |
| download | petitboot-a50d5fe279db71cf85fabeb675c99b167ec63dcb.zip petitboot-a50d5fe279db71cf85fabeb675c99b167ec63dcb.tar.gz | |
discover/event: Ensure event struct exists for async callers
When handling an event, user_event_handle_message() creates an event
struct with relevant parameters. Once user_event_handle_message() is
finished it frees the struct.
However in the case of a dhcp or add_url event, asynchronous jobs may be
spawned that will later reference the event struct. In particular this
becomes a problem when pxe_process_pair() handles an IPAPPEND name/value
pair and tries to access event->device.
In the case of dhcp and add_url events, we avoid this by changing the
event struct's talloc parent to the discover_context struct which
persists until all async pxe jobs have completed.
Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
| -rw-r--r-- | discover/device-handler.c | 2 | ||||
| -rw-r--r-- | discover/user-event.c | 8 |
2 files changed, 7 insertions, 3 deletions
diff --git a/discover/device-handler.c b/discover/device-handler.c index f6b6d22..346cb02 100644 --- a/discover/device-handler.c +++ b/discover/device-handler.c @@ -900,6 +900,7 @@ int device_handler_dhcp(struct device_handler *handler, /* create our context */ ctx = device_handler_discover_context_create(handler, dev); + talloc_steal(ctx, event); ctx->event = event; iterate_parsers(ctx); @@ -1171,6 +1172,7 @@ void device_handler_process_url(struct device_handler *handler, if (pb_url->scheme == pb_url_file) dev->device->type = DEVICE_TYPE_ANY; ctx = device_handler_discover_context_create(handler, dev); + talloc_steal(ctx, event); ctx->event = event; iterate_parsers(ctx); diff --git a/discover/user-event.c b/discover/user-event.c index 6ea754f..3ccac90 100644 --- a/discover/user-event.c +++ b/discover/user-event.c @@ -513,13 +513,13 @@ static void user_event_handle_message(struct user_event *uev, char *buf, break; case EVENT_ACTION_URL: result = user_event_url(uev, event); - break; + goto out; case EVENT_ACTION_CONF: result = user_event_conf(uev, event); break; case EVENT_ACTION_DHCP: result = user_event_dhcp(uev, event); - break; + goto out; case EVENT_ACTION_BOOT: result = user_event_boot(uev, event); break; @@ -530,8 +530,10 @@ static void user_event_handle_message(struct user_event *uev, char *buf, break; } + /* user_event_url() and user_event_dhcp() will steal the event context, + * but all others still need to free */ talloc_free(event); - +out: return; } |
