autofs-5.1.8 - fix kernel mount status notification

From: Ian Kent <raven@themaw.net>

The status return for attempted mount notification is not done
correctly in some cases leading to a status being sent to the
kernel multiple times or the send causing an error.

We must send a status to the kernel but it needs to be the correct
one. It definitely shouldn't be sent twice for the same mount attempt
and shouldn't be failing.

Signed-off-by: Ian Kent <raven@themaw.net>
---
 CHANGELOG         |    1 +
 daemon/direct.c   |   19 +++++++++++--------
 daemon/indirect.c |   19 +++++++++++--------
 3 files changed, 23 insertions(+), 16 deletions(-)

--- autofs-5.1.7.orig/CHANGELOG
+++ autofs-5.1.7/CHANGELOG
@@ -80,6 +80,7 @@
 - fix concat_options() error handling.
 - eliminate some more alloca usage.
 - use default stack size for threads.
+- fix kernel mount status notification.
 
 25/01/2021 autofs-5.1.7
 - make bind mounts propagation slave by default.
--- autofs-5.1.7.orig/daemon/direct.c
+++ autofs-5.1.7/daemon/direct.c
@@ -1143,12 +1143,18 @@ int handle_packet_expire_direct(struct a
 	return 0;
 }
 
-static void mount_send_fail(void *arg)
+static void mount_send_status(void *arg)
 {
 	struct ioctl_ops *ops = get_ioctl_ops();
 	struct pending_args *mt = arg;
 	struct autofs_point *ap = mt->ap;
-	ops->send_fail(ap->logopt, mt->ioctlfd, mt->wait_queue_token, -ENOENT);
+
+	if (mt->status)
+		ops->send_fail(ap->logopt, mt->ioctlfd,
+			       mt->wait_queue_token, mt->status);
+	else
+		ops->send_ready(ap->logopt,
+				mt->ioctlfd, mt->wait_queue_token);
 	ops->close(ap->logopt, mt->ioctlfd);
 }
 
@@ -1177,7 +1183,8 @@ static void *do_mount_direct(void *arg)
 
 	pending_mutex_unlock(args);
 
-	pthread_cleanup_push(mount_send_fail, &mt);
+	mt.status = 0;
+	pthread_cleanup_push(mount_send_status, &mt);
 
 	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &state);
 
@@ -1191,9 +1198,7 @@ static void *do_mount_direct(void *arg)
 	if (status == -1) {
 		error(ap->logopt,
 		      "can't stat direct mount trigger %s", mt.name);
-		ops->send_fail(ap->logopt,
-			       mt.ioctlfd, mt.wait_queue_token, -ENOENT);
-		ops->close(ap->logopt, mt.ioctlfd);
+		mt.status = -ENOENT;
 		pthread_setcancelstate(state, NULL);
 		pthread_exit(NULL);
 	}
@@ -1203,8 +1208,6 @@ static void *do_mount_direct(void *arg)
 		error(ap->logopt,
 		     "direct trigger not valid or already mounted %s",
 		     mt.name);
-		ops->send_ready(ap->logopt, mt.ioctlfd, mt.wait_queue_token);
-		ops->close(ap->logopt, mt.ioctlfd);
 		pthread_setcancelstate(state, NULL);
 		pthread_exit(NULL);
 	}
--- autofs-5.1.7.orig/daemon/indirect.c
+++ autofs-5.1.7/daemon/indirect.c
@@ -674,13 +674,18 @@ int handle_packet_expire_indirect(struct
 	return 0;
 }
 
-static void mount_send_fail(void *arg)
+static void mount_send_status(void *arg)
 {
 	struct ioctl_ops *ops = get_ioctl_ops();
 	struct pending_args *mt = arg;
 	struct autofs_point *ap = mt->ap;
-	ops->send_fail(ap->logopt,
-		       ap->ioctlfd, mt->wait_queue_token, -ENOENT);
+
+	if (mt->status)
+		ops->send_fail(ap->logopt, ap->ioctlfd,
+			       mt->wait_queue_token, mt->status);
+	else
+		ops->send_ready(ap->logopt,
+				ap->ioctlfd, mt->wait_queue_token);
 }
 
 static void *do_mount_indirect(void *arg)
@@ -709,7 +714,8 @@ static void *do_mount_indirect(void *arg
 
 	pending_mutex_unlock(args);
 
-	pthread_cleanup_push(mount_send_fail, &mt);
+	mt.status = 0;
+	pthread_cleanup_push(mount_send_status, &mt);
 
 	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &state);
 
@@ -722,9 +728,7 @@ static void *do_mount_indirect(void *arg
 	len = ncat_path(buf, sizeof(buf), ap->path, mt.name, mt.len);
 	if (!len) {
 		crit(ap->logopt, "path to be mounted is to long");
-		ops->send_fail(ap->logopt,
-			       ap->ioctlfd, mt.wait_queue_token,
-			      -ENAMETOOLONG);
+		mt.status = -ENAMETOOLONG;
 		pthread_setcancelstate(state, NULL);
 		pthread_exit(NULL);
 	}
@@ -733,7 +737,6 @@ static void *do_mount_indirect(void *arg
 	if (status != -1 && !(S_ISDIR(st.st_mode) && st.st_dev == mt.dev)) {
 		error(ap->logopt,
 		      "indirect trigger not valid or already mounted %s", buf);
-		ops->send_ready(ap->logopt, ap->ioctlfd, mt.wait_queue_token);
 		pthread_setcancelstate(state, NULL);
 		pthread_exit(NULL);
 	}