[Xen-devel] [PATCH 9/9] xl: fix main_config_update

[Wei Liu <wei.liu2@xxxxxxxxxx>]

Don't dereference NULL.

Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 tools/libxl/xl_cmdimpl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index d44eb4b..631dbd1 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -5010,7 +5010,7 @@ int main_config_update(int argc, char **argv)
         if (rc) { fprintf(stderr, "Failed to read config file: %s: %s\n",
                            filename, strerror(errno));
                   free(extra_config); return ERROR_FAIL; }
-        if (strlen(extra_config)) {
+        if (extra_config && strlen(extra_config)) {
             if (config_len > INT_MAX - (strlen(extra_config) + 2 + 1)) {
                 fprintf(stderr, "Failed to attach extra configration\n");
                 exit(1);
-- 
1.9.1


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