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libceph: convert ceph_pagelist.refcnt from atomic_t to refcount_t

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refcount_t type and corresponding API should be
used instead of atomic_t when the variable is used as
a reference counter. This allows to avoid accidental
refcounter overflows that might lead to use-after-free
situations.

Signed-off-by: Elena Reshetova <[email protected]>
Signed-off-by: Hans Liljestrand <[email protected]>
Signed-off-by: Kees Cook <[email protected]>
Signed-off-by: David Windsor <[email protected]>
Signed-off-by: Ilya Dryomov <[email protected]>
This commit is contained in:
Elena Reshetova 2017-03-17 14:10:29 +02:00 • committed by Ilya Dryomov
commit 0e1a5ee657
3 changed files with 5 additions and 5 deletions
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2
net/ceph/pagelist.c
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@ -16,7 +16,7 @@ static void ceph_pagelist_unmap_tail(struct ceph_pagelist *pl)
void ceph_pagelist_release(struct ceph_pagelist *pl)
{
if (!atomic_dec_and_test(&pl->refcnt))
if (!refcount_dec_and_test(&pl->refcnt))
return;
ceph_pagelist_unmap_tail(pl);
while (!list_empty(&pl->head)) {