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User-Agent: Mozilla/5.0 (compatible; Konqueror/3.4; Linux) KHTML/3.4.0 (like Gecko)

Description of problem:
This was found on RHEL-4-pre-U2 and patched there before U2 was frozen. 
  
If a keyring is not fully instantiated when it is destroyed, the kernel will   
oops when it tries to unlink the keyring name from the name list.   
   
The problem occurs in three stages:   
   
 (1) The key allocator initialises the type-specific data to all zeroes. In   
     the case of a keyring, this will become a link in the keyring name list   
     when the keyring is instantiated.   
   
 (2) If a user (any user) attempts to add a keyring with anything other than   
     an empty payload, the keyring instantiation function will fail with an   
     error and won't add the keyring to the name list.   
   
 (3) The keyring's destructor then sees that the keyring has a description   
     (name) and tries to remove the keyring from the name list, which oopses   
     because the link pointers are both zero.   
   

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1.keyctl add keyring a a @p   

Actual Results:  It oopses on a NULL pointer dereference. 

Expected Results:  It should get EINVAL. 

Additional info: