1 files changed, 6 insertions, 0 deletions

diff --git a/src/firejail/x11.c b/src/firejail/x11.c
index d7b50e936..7b21c2209 100644
--- a/src/firejail/x11.c
+++ b/src/firejail/x11.c
@@ -685,6 +685,12 @@ void x11_start_xpra(int argc, char **argv) {
         char *start_child_prefix = "--start-child=";
         char *start_child;
         start_child = malloc(total_length + strlen(start_child_prefix) + fpos + 2);
+        if (start_child == NULL)
+          {
+            fprintf(stderr, "Error: unable to allocate start_child to assemble command\n");
+            exit(1);
+          }
+            
         strcpy(start_child,start_child_prefix);
         for(i = 0; i < fpos; i++) {
           strncat(start_child,firejail_argv[i],strlen(firejail_argv[i]));