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Slab allocators: fail if ksize is called with a NULL parameter

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A NULL pointer means that the object was not allocated.  One cannot
determine the size of an object that has not been allocated.  Currently we
return 0 but we really should BUG() on attempts to determine the size of
something nonexistent.

krealloc() interprets NULL to mean a zero sized object.  Handle that
separately in krealloc().

Signed-off-by: Christoph Lameter <[email protected]>
Acked-by: Pekka Enberg <[email protected]>
Cc: Matt Mackall <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Christoph Lameter 2007-10-16 01:24:46 -07:00 • committed by Linus Torvalds
commit ef8b4520bd
4 changed files with 10 additions and 5 deletions
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3
mm/slob.c
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@ -484,7 +484,8 @@ size_t ksize(const void *block)
{
struct slob_page *sp;
if (unlikely(ZERO_OR_NULL_PTR(block)))
BUG_ON(!block);
if (unlikely(block == ZERO_SIZE_PTR))
return 0;
sp = (struct slob_page *)virt_to_page(block);