Check setuid() return value. Bugzilla #7116.

1 files changed, 5 insertions, 1 deletions

diff --git a/dga.c b/dga.c
index e2a7ce4..7305ecd 100644
--- a/dga.c
+++ b/dga.c
@@ -16,6 +16,7 @@
 #include <X11/Xmd.h>
 #include <X11/extensions/xf86dga.h>
 #include <ctype.h>
+#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <signal.h>
@@ -141,7 +142,10 @@ main(int argc, char *argv[])
 
 #ifndef __UNIXOS2__
    /* Give up root privs */
-   setuid(getuid());
+   if (setuid(getuid()) == -1) {
+      fprintf(stderr, "Unable to change uid: %s\n", strerror(errno));
+      exit(2);
+   }
 #endif
 
    XF86DGASetViewPort(dis, DefaultScreen(dis), 0, 0);