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| author | Reshetova, Elena <elena.reshetova@intel.com> | 2017-07-04 14:53:26 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-07-04 23:35:18 +0200 |
| commit | e7f027961759f334bcc939980ec35480faa7ef17 (patch) | |
| tree | 17b4b426728e7f2e2f79a15490391aec0745f602 | |
| parent | net, sctp: convert sctp_datamsg.refcnt from atomic_t to refcount_t (diff) | |
| download | linux-e7f027961759f334bcc939980ec35480faa7ef17.tar.xz linux-e7f027961759f334bcc939980ec35480faa7ef17.zip | |
net, sctp: convert sctp_chunk.refcnt 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>
| -rw-r--r-- | include/net/sctp/structs.h | 2 | ||||
| -rw-r--r-- | net/sctp/sm_make_chunk.c | 6 |
2 files changed, 4 insertions, 4 deletions
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h index 4d7c855d8443..0dfc5c14b696 100644 --- a/include/net/sctp/structs.h +++ b/include/net/sctp/structs.h @@ -524,7 +524,7 @@ int sctp_chunk_abandoned(struct sctp_chunk *); struct sctp_chunk { struct list_head list; - atomic_t refcnt; + refcount_t refcnt; /* How many times this chunk have been sent, for prsctp RTX policy */ int sent_count; diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c index 3af4dd024ec0..4e16b02ed832 100644 --- a/net/sctp/sm_make_chunk.c +++ b/net/sctp/sm_make_chunk.c @@ -1345,7 +1345,7 @@ struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, INIT_LIST_HEAD(&retval->transmitted_list); INIT_LIST_HEAD(&retval->frag_list); SCTP_DBG_OBJCNT_INC(chunk); - atomic_set(&retval->refcnt, 1); + refcount_set(&retval->refcnt, 1); nodata: return retval; @@ -1458,13 +1458,13 @@ void sctp_chunk_free(struct sctp_chunk *chunk) /* Grab a reference to the chunk. */ void sctp_chunk_hold(struct sctp_chunk *ch) { - atomic_inc(&ch->refcnt); + refcount_inc(&ch->refcnt); } /* Release a reference to the chunk. */ void sctp_chunk_put(struct sctp_chunk *ch) { - if (atomic_dec_and_test(&ch->refcnt)) + if (refcount_dec_and_test(&ch->refcnt)) sctp_chunk_destroy(ch); } |