[lvm-devel] clvmd-cman.c: another unchecked malloc

[Jim Meyering]

There's an unchecked malloc in clvmd-cman.c's get_members function:

	if (node_updown == NULL) {
		node_updown =
			(int *) malloc(sizeof(int) *
				       max(num_nodes, max_updown_nodes));
		memset(node_updown, 0,
		       sizeof(int) * max(num_nodes, max_updown_nodes));
	}

Here's a fix.
At the same time, I've taken the liberty of factoring out
the common sub-expression (buffer length) and eliminating
the cast on malloc's return value.

	* daemons/clvmd/clvmd-cman.c (get_members): Don't dereference NULL
	upon failed malloc.

Index: daemons/clvmd/clvmd-cman.c
===================================================================
RCS file: /cvs/lvm2/LVM2/daemons/clvmd/clvmd-cman.c,v
retrieving revision 1.17
diff -u -p -r1.17 clvmd-cman.c
--- daemons/clvmd/clvmd-cman.c	23 Apr 2007 14:55:28 -0000	1.17
+++ daemons/clvmd/clvmd-cman.c	26 Apr 2007 13:46:02 -0000
@@ -320,11 +320,10 @@ static void get_members()
 	}

 	if (node_updown == NULL) {
-		node_updown =
-			(int *) malloc(sizeof(int) *
-				       max(num_nodes, max_updown_nodes));
-		memset(node_updown, 0,
-		       sizeof(int) * max(num_nodes, max_updown_nodes));
+		size_t buf_len = sizeof(int) * max(num_nodes, max_updown_nodes));
+		node_updown = malloc(buf_len);
+		if (node_updown)
+			memset(node_updown, 0, buf_len);
 	}
 }