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| author | Reshetova, Elena <elena.reshetova@intel.com> | 2017-07-04 15:53:18 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-07-04 22:35:18 +0100 |
| commit | 6c5a1c4a2afdcc21434b86996b49460f07ee69a3 (patch) | |
| tree | e4ec47608fcee238c141bb45c2f694e7ada9c484 /net/rds | |
| parent | 803ea85053b75d35f9ebb3aa7a28db35d82c6d82 (diff) | |
| download | lwn-6c5a1c4a2afdcc21434b86996b49460f07ee69a3.tar.gz lwn-6c5a1c4a2afdcc21434b86996b49460f07ee69a3.zip | |
net, rds: convert rds_message.m_refcount from atomic_t to refcount_t
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 <ishkamiel@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David Windsor <dwindsor@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rds')
| -rw-r--r-- | net/rds/message.c | 12 | ||||
| -rw-r--r-- | net/rds/rds.h | 2 |
2 files changed, 7 insertions, 7 deletions
diff --git a/net/rds/message.c b/net/rds/message.c index 49bfb512d808..4318cc9b78f7 100644 --- a/net/rds/message.c +++ b/net/rds/message.c @@ -48,8 +48,8 @@ static unsigned int rds_exthdr_size[__RDS_EXTHDR_MAX] = { void rds_message_addref(struct rds_message *rm) { - rdsdebug("addref rm %p ref %d\n", rm, atomic_read(&rm->m_refcount)); - atomic_inc(&rm->m_refcount); + rdsdebug("addref rm %p ref %d\n", rm, refcount_read(&rm->m_refcount)); + refcount_inc(&rm->m_refcount); } EXPORT_SYMBOL_GPL(rds_message_addref); @@ -83,9 +83,9 @@ static void rds_message_purge(struct rds_message *rm) void rds_message_put(struct rds_message *rm) { - rdsdebug("put rm %p ref %d\n", rm, atomic_read(&rm->m_refcount)); - WARN(!atomic_read(&rm->m_refcount), "danger refcount zero on %p\n", rm); - if (atomic_dec_and_test(&rm->m_refcount)) { + rdsdebug("put rm %p ref %d\n", rm, refcount_read(&rm->m_refcount)); + WARN(!refcount_read(&rm->m_refcount), "danger refcount zero on %p\n", rm); + if (refcount_dec_and_test(&rm->m_refcount)) { BUG_ON(!list_empty(&rm->m_sock_item)); BUG_ON(!list_empty(&rm->m_conn_item)); rds_message_purge(rm); @@ -206,7 +206,7 @@ struct rds_message *rds_message_alloc(unsigned int extra_len, gfp_t gfp) rm->m_used_sgs = 0; rm->m_total_sgs = extra_len / sizeof(struct scatterlist); - atomic_set(&rm->m_refcount, 1); + refcount_set(&rm->m_refcount, 1); INIT_LIST_HEAD(&rm->m_sock_item); INIT_LIST_HEAD(&rm->m_conn_item); spin_lock_init(&rm->m_rs_lock); diff --git a/net/rds/rds.h b/net/rds/rds.h index ea72d6e33c14..516bcc89b46f 100644 --- a/net/rds/rds.h +++ b/net/rds/rds.h @@ -356,7 +356,7 @@ static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie) #define RDS_MSG_FLUSH 8 struct rds_message { - atomic_t m_refcount; + refcount_t m_refcount; struct list_head m_sock_item; struct list_head m_conn_item; struct rds_incoming m_inc; |