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https://github.com/lathiat/avahi/commit/fd482a74625b8db8547b8cfca3ee3d3c6c721423.patch
From: Tommi Rantala <tommi.t.rantala@nokia.com>
Date: Mon, 8 Feb 2021 11:04:43 +0200
Subject: [PATCH] Fix NULL pointer crashes from #175
avahi-daemon is crashing when running "ping .local".
The crash is due to failing assertion from NULL pointer.
Add missing NULL pointer checks to fix it.
Introduced in #175 - merge commit 8f75a045709a780c8cf92a6a21e9d35b593bdecd
--- a/avahi-core/browse-dns-server.c
+++ b/avahi-core/browse-dns-server.c
@@ -343,7 +343,10 @@ AvahiSDNSServerBrowser *avahi_s_dns_server_browser_new(
AvahiSDNSServerBrowser* b;
b = avahi_s_dns_server_browser_prepare(server, interface, protocol, domain, type, aprotocol, flags, callback, userdata);
+ if (!b)
+ return NULL;
+
avahi_s_dns_server_browser_start(b);
return b;
-}
\ No newline at end of file
+}
--- a/avahi-core/browse-domain.c
+++ b/avahi-core/browse-domain.c
@@ -253,7 +253,10 @@ AvahiSDomainBrowser *avahi_s_domain_browser_new(
AvahiSDomainBrowser *b;
b = avahi_s_domain_browser_prepare(server, interface, protocol, domain, type, flags, callback, userdata);
+ if (!b)
+ return NULL;
+
avahi_s_domain_browser_start(b);
return b;
-}
\ No newline at end of file
+}
--- a/avahi-core/browse-service-type.c
+++ b/avahi-core/browse-service-type.c
@@ -171,6 +171,9 @@ AvahiSServiceTypeBrowser *avahi_s_service_type_browser_new(
AvahiSServiceTypeBrowser *b;
b = avahi_s_service_type_browser_prepare(server, interface, protocol, domain, flags, callback, userdata);
+ if (!b)
+ return NULL;
+
avahi_s_service_type_browser_start(b);
return b;
--- a/avahi-core/browse-service.c
+++ b/avahi-core/browse-service.c
@@ -184,6 +184,9 @@ AvahiSServiceBrowser *avahi_s_service_browser_new(
AvahiSServiceBrowser *b;
b = avahi_s_service_browser_prepare(server, interface, protocol, service_type, domain, flags, callback, userdata);
+ if (!b)
+ return NULL;
+
avahi_s_service_browser_start(b);
return b;
--- a/avahi-core/browse.c
+++ b/avahi-core/browse.c
@@ -634,6 +634,9 @@ AvahiSRecordBrowser *avahi_s_record_browser_new(
AvahiSRecordBrowser *b;
b = avahi_s_record_browser_prepare(server, interface, protocol, key, flags, callback, userdata);
+ if (!b)
+ return NULL;
+
avahi_s_record_browser_start_query(b);
return b;
--- a/avahi-core/resolve-address.c
+++ b/avahi-core/resolve-address.c
@@ -286,7 +286,10 @@ AvahiSAddressResolver *avahi_s_address_resolver_new(
AvahiSAddressResolver *b;
b = avahi_s_address_resolver_prepare(server, interface, protocol, address, flags, callback, userdata);
+ if (!b)
+ return NULL;
+
avahi_s_address_resolver_start(b);
return b;
-}
\ No newline at end of file
+}
--- a/avahi-core/resolve-host-name.c
+++ b/avahi-core/resolve-host-name.c
@@ -318,7 +318,10 @@ AvahiSHostNameResolver *avahi_s_host_name_resolver_new(
AvahiSHostNameResolver *b;
b = avahi_s_host_name_resolver_prepare(server, interface, protocol, host_name, aprotocol, flags, callback, userdata);
+ if (!b)
+ return NULL;
+
avahi_s_host_name_resolver_start(b);
return b;
-}
\ No newline at end of file
+}
--- a/avahi-core/resolve-service.c
+++ b/avahi-core/resolve-service.c
@@ -519,7 +519,10 @@ AvahiSServiceResolver *avahi_s_service_resolver_new(
AvahiSServiceResolver *b;
b = avahi_s_service_resolver_prepare(server, interface, protocol, name, type, domain, aprotocol, flags, callback, userdata);
+ if (!b)
+ return NULL;
+
avahi_s_service_resolver_start(b);
return b;
-}
\ No newline at end of file
+}
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