proc: warn on non-existing proc entries

* warn if creation goes on to non-existent directory
* warn if removal goes on from non-existing directory
* warn if non-existing proc entry is removed

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 2 deletions

diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index ce2d95477701..08f4d71dacd7 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -312,8 +312,10 @@ static int __xlate_proc_name(const char *name, struct proc_dir_entry **ret,
                         if (proc_match(len, cp, de))
                                 break;
                 }
-                if (!de)
+                if (!de) {
+                        WARN(1, "name '%s'\n", name);
                         return -ENOENT;
+                }
                 cp += len + 1;
         }
         *residual = cp;
@@ -818,8 +820,10 @@ void remove_proc_entry(const char *name, struct proc_dir_entry *parent)
                 }
         }
         spin_unlock(&proc_subdir_lock);
-        if (!de)
+        if (!de) {
+                WARN(1, "name '%s'\n", name);
                 return;
+        }
 
         spin_lock(&de->pde_unload_lock);
         /*