Fix: handle NULL case in spl_kmem_free_track()

When DEBUG_KMEM_TRACKING is enabled in SPL, we keep tracking all the buffers alloced by kmem_alloc() and kmem_zalloc(). If a NULL pointer which indicates no track info in SPL is passed to spl_kmem_free_track, we just ignore it. Signed-off-by: GeLiXin <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue openzfs/zfs#4967 Closes openzfs#567
rtvd · Aug 19, 2016 · aeb9baa · aeb9baa
1 parent 576865b
commit aeb9baa
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/module/spl/spl-kmem.c b/module/spl/spl-kmem.c
@@ -383,6 +383,10 @@ spl_kmem_free_track(const void *ptr, size_t size)
 {
  kmem_debug_t *dptr;
 
+ /* Ignore NULL pointer since we haven't tracked it at all*/
+ if (ptr == NULL)
+ return;
+
  /* Must exist in hash due to kmem_alloc() */
  dptr = kmem_del_init(&kmem_lock, kmem_table, KMEM_HASH_BITS, ptr);
  ASSERT3P(dptr, !=, NULL);