#define ENOMEM      12  /* Out of memory */

#define NULL (void*)0

extern void *malloc (unsigned long __size) __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__malloc__)) ;

extern void free (void *__ptr) __attribute__ ((__nothrow__ , __leaf__));

#define PAGE_SIZE 12

int *x = NULL;
unsigned int size = PAGE_SIZE+1;

int inet_ehash_locks_alloc()
{
#ifdef CONFIG_NUMA
    if (size > PAGE_SIZE)
      x = malloc(size);
    else
#endif
    x =	malloc(size); // (2)
    if (!x)
      return ENOMEM;
  return 0;
}

void inet_ehash_locks_free()
{
  if (x) {
#ifdef CONFIG_NUMA
    if (size > PAGE_SIZE)
      free(x);
    else
#else
    free(x);
#endif
    x = NULL; // (4) ERROR
  }
}

int main(void)
{
  inet_ehash_locks_alloc(); // (1)
  inet_ehash_locks_free(); // (3)
  return 0;
}

diff --git a/simple/218ad12.c b/simple/218ad12.c
--- a/simple/218ad12.c
+++ b/simple/218ad12.c
@@ -30,9 +30,8 @@
     if (size > PAGE_SIZE)
       free(x);
     else
-#else
-    free(x);
 #endif
+      free(x);
     x = NULL; // (4) ERROR
   }
 }

#include <errno.h>
#include <stdlib.h>

#define PAGE_SIZE 12

int *x = NULL;
unsigned int size = PAGE_SIZE+1;

int main(int argc, char** argv)
{
//  inet_ehash_locks_alloc();
#ifdef CONFIG_NUMA
  if (size > PAGE_SIZE)
    x = malloc(size);
  else
#endif
    x =	malloc(size);
    if (!x)
      return ENOMEM;
  
//  inet_ehash_locks_free();
  if (x) {
#ifdef CONFIG_NUMA
    if (size > PAGE_SIZE)
      free(x);
    else
#else
      free(x);
#endif
    x = NULL; // ERROR
  }
  return 0;
}

. include/net/inet_hashtables.h:147:inet_ehash_locks_alloc()
. 169: hashinfo->ehash_locks =	kmalloc(size * sizeof(rwlock_t), GFP_KERNEL);
. include/net/inet_hashtables.h:180:inet_ehash_locks_free()
. 128: if (hashinfo->ehash_locks)
. ERROR 192: hashinfo->ehash_locks = NULL;