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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 <clameter@sgi.com>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Matt Mackall <mpm@selenic.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Lameter 2007-10-16 01:24:46 -07:00 • committed by Linus Torvalds
parent 0da7e01f5f
commit ef8b4520bd
4 changed files with 10 additions and 5 deletions
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3
mm/slab.c
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@ -4446,7 +4446,8 @@ const struct seq_operations slabstats_op = {
*/
size_t ksize(const void *objp)
{
if (unlikely(ZERO_OR_NULL_PTR(objp)))
BUG_ON(!objp);
if (unlikely(objp == ZERO_SIZE_PTR))
return 0;
return obj_size(virt_to_cache(objp));