linux-kernel - re: sysctl: register only tables of sysctl files

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Date:	Mon, 30 Jan 2012 16:39:33 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	ebiederm@...ssion.com
Cc:	linux-kernel@...r.kernel.org
Subject: re: sysctl: register only tables of sysctl files

Hi Eric,

The patch f728019bb72e: "sysctl: register only tables of sysctl 
files" from Jan 22, 2012, has a weird thing going on and I don't know
how to fix it:

+       if (nr_dirs && nr_files) {
+               struct ctl_table *new;
+               files = kzalloc(sizeof(struct ctl_table) * (nr_files + 1),
+                               GFP_KERNEL);
+               if (!files)
+                       goto out;
+
+               ctl_table_arg = files;
+               for (new = files, entry = table; entry->procname; entry++) {
+                       if (entry->child)
+                               continue;
+                       *new = *entry;
+                       new++;
+               }
+       }
+
+       /* Register everything except a directory full of subdirectories */
+       if (nr_files || !nr_dirs) {
+               struct ctl_table_header *header;
+               header = __register_sysctl_table(root, namespaces, path, files);
+               if (!header) {
+                       kfree(ctl_table_arg);
                              ^^^^^^^^^^^^^
+                       goto out;
+               }
+
+               /* Remember if we need to free the file table */
+               header->ctl_table_arg = ctl_table_arg;
                                        ^^^^^^^^^^^^^
These are NULL unless "nr_dirs" is non-zero (so it's always NULL here).

+               **subheader = header;
+               (*subheader)++;
+       }

regards,
dan carpenter

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