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From: Warner Losh <imp@FreeBSD.org>
Date: Tue, 20 Apr 2010 20:39:42 +0000 (UTC)
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Subject: svn commit: r206916 - head/sys/kern
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Author: imp
Date: Tue Apr 20 20:39:42 2010
New Revision: 206916
URL: http://svn.freebsd.org/changeset/base/206916

Log:
  Make sure that we free the passed in data message if we don't actually
  insert it onto the queue.  Also, fix a mtx leak if someone turns off
  devctl while we're processing a messages.
  
  MFC after:	5 days

Modified:
  head/sys/kern/subr_bus.c

Modified: head/sys/kern/subr_bus.c
==============================================================================
--- head/sys/kern/subr_bus.c	Tue Apr 20 20:36:38 2010	(r206915)
+++ head/sys/kern/subr_bus.c	Tue Apr 20 20:39:42 2010	(r206916)
@@ -545,15 +545,16 @@ devctl_queue_data(char *data)
 	struct proc *p;
 
 	if (strlen(data) == 0)
-		return;
+		goto out;
 	if (devctl_queue_length == 0)
-		return;
+		goto out;
 	n1 = malloc(sizeof(*n1), M_BUS, M_NOWAIT);
 	if (n1 == NULL)
-		return;
+		goto out;
 	n1->dei_data = data;
 	mtx_lock(&devsoftc.mtx);
 	if (devctl_queue_length == 0) {
+		mtx_unlock(&devsoftc.mtx);
 		free(n1->dei_data, M_BUS);
 		free(n1, M_BUS);
 		return;
@@ -577,6 +578,14 @@ devctl_queue_data(char *data)
 		psignal(p, SIGIO);
 		PROC_UNLOCK(p);
 	}
+	return;
+out:
+	/*
+	 * We have to free data on all error paths since the caller
+	 * assumes it will be free'd when this item is dequeued.
+	 */
+	free(data, M_BUS);
+	return;
 }
 
 /**