[PATCH v3 02/10] libxl: turn two malloc's to libxl__malloc

[Wei Liu <wei.liu2@citrix.com>]

One is to combine malloc + libxl__alloc_failed. The other is to avoid
dereferencing NULL pointer in case of malloc failure. Also use gc for
memory allocation and remove free() in second case.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
---
 tools/libxl/libxl_aoutils.c | 3 +--
 tools/libxl/libxl_dm.c      | 3 +--
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/tools/libxl/libxl_aoutils.c b/tools/libxl/libxl_aoutils.c
index 0931eee..0300396 100644
--- a/tools/libxl/libxl_aoutils.c
+++ b/tools/libxl/libxl_aoutils.c
@@ -245,8 +245,7 @@ static void datacopier_readable(libxl__egc *egc, libxl__ev_fd *ev,
 
             buf = LIBXL_TAILQ_LAST(&dc->bufs, libxl__datacopier_bufs);
             if (!buf || buf->used >= sizeof(buf->buf)) {
-                buf = malloc(sizeof(*buf));
-                if (!buf) libxl__alloc_failed(CTX, __func__, 1, sizeof(*buf));
+                buf = libxl__malloc(NOGC, sizeof(*buf));
                 buf->used = 0;
                 LIBXL_TAILQ_INSERT_TAIL(&dc->bufs, buf, entry);
             }
diff --git a/tools/libxl/libxl_dm.c b/tools/libxl/libxl_dm.c
index ad434f0..8f3c7a5 100644
--- a/tools/libxl/libxl_dm.c
+++ b/tools/libxl/libxl_dm.c
@@ -1010,7 +1010,7 @@ static int libxl__write_stub_dmargs(libxl__gc *gc,
         i++;
     }
     dmargs_size++;
-    dmargs = (char *) malloc(dmargs_size);
+    dmargs = (char *) libxl__malloc(gc, dmargs_size);
     i = 1;
     dmargs[0] = '\0';
     while (args[i] != NULL) {
@@ -1030,7 +1030,6 @@ retry_transaction:
     if (!xs_transaction_end(ctx->xsh, t, 0))
         if (errno == EAGAIN)
             goto retry_transaction;
-    free(dmargs);
     return 0;
 }
 
-- 
1.9.1