"Jordan Crouse" <jordan.crouse@amd.com> says:

The following patch makes coreutils/test.c act fail gracefully if getgroups() 
returns a -1.  This fixes a problem on the One Laptop Per Child ROM image
whereby we were getting odd Memory exhausted messages for '[' and 'test'.

Found by Mitch Bradley <wmb@firmworks.com>
(Tweaked by Rob: no need to initialize a static to NULL, or realloc something
that's only allocated when it's NULL.)

1 files changed, 5 insertions, 3 deletions

diff --git a/coreutils/test.c b/coreutils/test.c
index bbc802283..c1097c28c 100644
--- a/coreutils/test.c
+++ b/coreutils/test.c
@@ -151,7 +151,7 @@ typedef int arith_t;
 
 static char **t_wp;
 static struct t_op const *t_wp_op;
-static gid_t *group_array = NULL;
+static gid_t *group_array;
 static int ngroups;
 
 static enum token t_lex(char *s);
@@ -547,8 +547,10 @@ static int test_eaccess(char *path, int mode)
 static void initialize_group_array(void)
 {
         ngroups = getgroups(0, NULL);
-        group_array = xrealloc(group_array, ngroups * sizeof(gid_t));
-        getgroups(ngroups, group_array);
+        if (ngroups > 0) {
+                group_array = xmalloc(ngroups * sizeof(gid_t));
+                getgroups(ngroups, group_array);
+        }
 }
 
 /* Return non-zero if GID is one that we have in our groups list. */