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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
fs/ceph/mds_client.c
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@ -1991,7 +1991,7 @@ static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
if (req->r_pagelist) {
struct ceph_pagelist *pagelist = req->r_pagelist;
atomic_inc(&pagelist->refcnt);
refcount_inc(&pagelist->refcnt);
ceph_msg_data_add_pagelist(msg, pagelist);
msg->hdr.data_len = cpu_to_le32(pagelist->length);
} else {