[Xen-devel] [PATCH] libxl: correct allocation size in libxl_list_vm

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

# HG changeset patch
# User Ian Campbell <ian.campbell@xxxxxxxxxx>
# Date 1316609964 -3600
# Node ID 4a6d34dffcf9d568a7830ee6de07a581c57e7342
# Parent  b11af4a5cdc6a94e41a81d456f07b4d70cdb5ffe
libxl: correct allocation size in libxl_list_vm

*ptr has type libxl_vminfo not libxl_domid, so correct calloc call.

This the second instance of this bug I've noticed recently, I did a
quick audit of other similar uses of sizeof(...) and all I spotted
were a couple of harmlessly reversed calloc arguments. It's a pretty
strong argument for "foo = ..alloc(sizeof(*foo))" rather than
"alloc(sizeof(foos_type))" though...

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

diff -r b11af4a5cdc6 -r 4a6d34dffcf9 tools/libxl/libxl.c
--- a/tools/libxl/libxl.c       Wed Sep 21 13:59:24 2011 +0100
+++ b/tools/libxl/libxl.c       Wed Sep 21 13:59:24 2011 +0100
@@ -449,7 +449,7 @@ libxl_vminfo * libxl_list_vm(libxl_ctx *
     xc_domaininfo_t info[1024];
     int size = 1024;
 
-    ptr = calloc(size, sizeof(libxl_dominfo));
+    ptr = calloc(size, sizeof(libxl_vminfo));
     if (!ptr)
         return NULL;
 
diff -r b11af4a5cdc6 -r 4a6d34dffcf9 tools/libxl/libxl_dm.c
--- a/tools/libxl/libxl_dm.c    Wed Sep 21 13:59:24 2011 +0100
+++ b/tools/libxl/libxl_dm.c    Wed Sep 21 13:59:24 2011 +0100
@@ -778,7 +778,7 @@ retry_transaction:
     libxl_domain_unpause(ctx, domid);
 
     if (starting_r) {
-        *starting_r = calloc(sizeof(libxl__device_model_starting), 1);
+        *starting_r = calloc(1, sizeof(libxl__device_model_starting));
         (*starting_r)->domid = info->domid;
         (*starting_r)->dom_path = libxl__xs_get_dompath(gc, info->domid);
         (*starting_r)->for_spawn = NULL;
@@ -855,11 +855,11 @@ int libxl__create_device_model(libxl__gc
 
     if (starting_r) {
         rc = ERROR_NOMEM;
-        *starting_r = calloc(sizeof(libxl__device_model_starting), 1);
+        *starting_r = calloc(1, sizeof(libxl__device_model_starting));
         if (!*starting_r)
             goto out_close;
         p = *starting_r;
-        p->for_spawn = calloc(sizeof(libxl__spawn_starting), 1);
+        p->for_spawn = calloc(1, sizeof(libxl__spawn_starting));
     } else {
         p = &buf_starting;
         p->for_spawn = NULL;

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