[PATCH 15/23] net, xfrm: convert sec_path.refcnt from atomic_t to refcount_t
From: Elena Reshetova <elena.reshetova@intel.com>
Date: 2017-03-17 12:25:24
Also in:
ceph-devel, linux-hams, linux-nfs, linux-rdma, linux-sctp, lkml
Subsystem:
networking [general], networking [ipsec], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Steffen Klassert, Herbert Xu, Linus Torvalds
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 <elena.reshetova@intel.com> Signed-off-by: Hans Liljestrand <redacted> Signed-off-by: Kees Cook <redacted> Signed-off-by: David Windsor <redacted> --- include/net/xfrm.h | 6 +++--- net/xfrm/xfrm_input.c | 4 ++-- 2 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index be30846..35d1cca 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h@@ -1005,7 +1005,7 @@ struct xfrm_offload { }; struct sec_path { - atomic_t refcnt; + refcount_t refcnt; int len; int olen;
@@ -1026,7 +1026,7 @@ static inline struct sec_path * secpath_get(struct sec_path *sp) { if (sp) - atomic_inc(&sp->refcnt); + refcount_inc(&sp->refcnt); return sp; }
@@ -1035,7 +1035,7 @@ void __secpath_destroy(struct sec_path *sp); static inline void secpath_put(struct sec_path *sp) { - if (sp && atomic_dec_and_test(&sp->refcnt)) + if (sp && refcount_dec_and_test(&sp->refcnt)) __secpath_destroy(sp); }
diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index 46bdb4f..203ba90 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c@@ -114,7 +114,7 @@ struct sec_path *secpath_dup(struct sec_path *src) for (i = 0; i < sp->len; i++) xfrm_state_hold(sp->xvec[i]); } - atomic_set(&sp->refcnt, 1); + refcount_set(&sp->refcnt, 1); return sp; } EXPORT_SYMBOL(secpath_dup);
@@ -124,7 +124,7 @@ int secpath_set(struct sk_buff *skb) struct sec_path *sp; /* Allocate new secpath or COW existing one. */ - if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) { + if (!skb->sp || refcount_read(&skb->sp->refcnt) != 1) { sp = secpath_dup(skb->sp); if (!sp) return -ENOMEM;
--
2.7.4