[PATCH] Handle maloc() failure in xen_get_nr_phys_cpus()

[horms@xxxxxxxxxxxx (Simon Horman)]

Currently xen_get_nr_phys_cpus() doesn't write to xen_phys_notes if
allocation fails, but it doesn't return an error either, leaving
xen_phys_notes wide open to be accessed by other functions later.

Signed-off-by: Simon Horman <horms at verge.net.au>

Index: kexec-tools-unstable/kexec/crashdump-xen.c
===================================================================
--- kexec-tools-unstable.orig/kexec/crashdump-xen.c	2007-05-09 18:44:48.000000000 +0900
+++ kexec-tools-unstable/kexec/crashdump-xen.c	2007-05-09 18:50:14.000000000 +0900
@@ -93,13 +93,12 @@ int xen_get_nr_phys_cpus(void)
 	if ((cpus = kexec_iomem_for_each_line(match, NULL, NULL))) {
 		n = sizeof(struct crash_note_info) * cpus;
 		xen_phys_notes = malloc(n);
-		if (xen_phys_notes) {
-			memset(xen_phys_notes, 0, n);
-			kexec_iomem_for_each_line(match,
-						  xen_crash_note_callback,
-						  NULL);
+		if (!xen_phys_notes) {
+			fprintf(stderr, "failed to allocate xen_phys_notes.\n");
+			return -1;
 		}
-
+		memset(xen_phys_notes, 0, n);
+		kexec_iomem_for_each_line(match, xen_crash_note_callback, NULL);
 		xen_phys_cpus = cpus;
 	}