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| author | Christoph Lameter <clameter@sgi.com> | 2007-10-16 10:24:46 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 18:42:53 +0200 |
| commit | ef8b4520bd9f8294ffce9abd6158085bde5dc902 (patch) | |
| tree | c099a16691ac06208f4d3d65b71e7adaf7361fcd /mm/util.c | |
| parent | calculation of pgoff in do_linear_fault() uses mixed units (diff) | |
| download | linux-ef8b4520bd9f8294ffce9abd6158085bde5dc902.tar.xz linux-ef8b4520bd9f8294ffce9abd6158085bde5dc902.zip | |
Slab allocators: fail if ksize is called with a NULL parameter
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>
Diffstat (limited to 'mm/util.c')
| -rw-r--r-- | mm/util.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/mm/util.c b/mm/util.c index bf340d806868..5f64026cbb4d 100644 --- a/mm/util.c +++ b/mm/util.c @@ -81,14 +81,16 @@ EXPORT_SYMBOL(kmemdup); void *krealloc(const void *p, size_t new_size, gfp_t flags) { void *ret; - size_t ks; + size_t ks = 0; if (unlikely(!new_size)) { kfree(p); return ZERO_SIZE_PTR; } - ks = ksize(p); + if (p) + ks = ksize(p); + if (ks >= new_size) return (void *)p; |