mountd: minor v4root_set cleanup, check strdup return

Move more of v4root_set into a helper function.

Also, check the return value from strdup.  (We don't really handle the
error well yet--we'll end up giving negative replies to export upcalls
when we should be giving the kernel exports, resulting in spurious
-ENOENTs or -ESTALE's--but that's better than crashing with a NULL
dereference.)

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

diff --git a/utils/mountd/v4root.c b/utils/mountd/v4root.c
index ac800b3dbc6d0826139e9db5e17950707663370e..7fd6af3dd4592462addb005c3986031d8f5020ad 100644 (file)
--- a/utils/mountd/v4root.c
+++ b/utils/mountd/v4root.c
@@ -137,6 +137,31 @@ int pseudofs_update(char *hostname, char *path, nfs_export *source)
        return 0;
 }
 
+static int v4root_add_parents(nfs_export *exp)
+{
+       char *hostname = exp->m_export.e_hostname;
+       char *path;
+       char *ptr;
+
+       path = strdup(exp->m_export.e_path);
+       if (!path)
+               return -ENOMEM;
+       for (ptr = path + 1; ptr; ptr = strchr(ptr, '/')) {
+               int ret;
+               char saved;
+
+               saved = *ptr;
+               *ptr = '\0';
+               ret = pseudofs_update(hostname, path, exp);
+               if (ret)
+                       return ret;
+               *ptr = saved;
+               ptr++;
+       }
+       free(path);
+       return 0;
+}
+
 /*
  * Create pseudo exports by running through the real export
  * looking at the components of the path that make up the export.
@@ -148,9 +173,7 @@ void
 v4root_set()
 {
        nfs_export      *exp;
-       int     i;
-       char *path, *ptr;
-       char *hostname;
+       int     i, ret;
 
        if (!v4root_needed)
                return;
@@ -159,8 +182,6 @@ v4root_set()
 
        for (i = 0; i < MCL_MAXTYPES; i++) {
                for (exp = exportlist[i].p_head; exp; exp = exp->m_next) {
-                       hostname = exp->m_export.e_hostname;
-
                        if (exp->m_export.e_flags & NFSEXP_V4ROOT)
                                /*
                                 * We just added this one, so its
@@ -168,19 +189,8 @@ v4root_set()
                                 */
                                continue;
 
-                       path = strdup(exp->m_export.e_path);
-                       for (ptr = path + 1; ptr; ptr = strchr(ptr, '/')) {
-                               int ret;
-                               char saved;
-
-                               saved = *ptr;
-                               *ptr = '\0';
-                               ret = pseudofs_update(hostname, path, exp);
-                               /* XXX: error handling */
-                               *ptr = saved;
-                               ptr++;
-                       }
-                       free(path);
+                       ret = v4root_add_parents(exp);
+                       /* XXX: error handling! */
                }
        }
 }