proc: detect duplicate names on registration

Print a warning if PDE is registered with a name which already exists in
target directory.

Bug report and a simple fix can be found here:
http://bugzilla.kernel.org/show_bug.cgi?id=8798

[\n fixlet and no undescriptive variable usage --adobriyan]
[akpm@linux-foundation.org: make printk comprehensible]
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index e37ea3e53de860a443e41088b1cd70a0cf69d702..b9dd3628d43a233bcf2860a587a12f59b969388d 100644 (file)
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -521,6 +521,7 @@ static const struct inode_operations proc_dir_inode_operations = {
 static int proc_register(struct proc_dir_entry * dir, struct proc_dir_entry * dp)
 {
        unsigned int i;
+       struct proc_dir_entry *tmp;
        
        i = get_inode_number();
        if (i == 0)
@@ -544,6 +545,15 @@ static int proc_register(struct proc_dir_entry * dir, struct proc_dir_entry * dp
        }
 
        spin_lock(&proc_subdir_lock);
+
+       for (tmp = dir->subdir; tmp; tmp = tmp->next)
+               if (strcmp(tmp->name, dp->name) == 0) {
+                       printk(KERN_WARNING "proc_dir_entry '%s' already "
+                                       "registered\n", dp->name);
+                       dump_stack();
+                       break;
+               }
+
        dp->next = dir->subdir;
        dp->parent = dir;
        dir->subdir = dp;