From 22c70d1a9c639b432ffdf083bea44752ad9fc8f3 Mon Sep 17 00:00:00 2001 From: Elena Reshetova Date: Thu, 9 Mar 2017 09:44:02 +0200 Subject: scsi: libfc: convert fc_fcp_pkt.ref_cnt 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 Signed-off-by: Hans Liljestrand Signed-off-by: Kees Cook Signed-off-by: David Windsor Acked-by: Johannes Thumshirn Signed-off-by: Martin K. Petersen --- drivers/scsi/libfc/fc_fcp.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'drivers/scsi/libfc') diff --git a/drivers/scsi/libfc/fc_fcp.c b/drivers/scsi/libfc/fc_fcp.c index 0e67621477a8..a808e8ef1d08 100644 --- a/drivers/scsi/libfc/fc_fcp.c +++ b/drivers/scsi/libfc/fc_fcp.c @@ -154,7 +154,7 @@ static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp) memset(fsp, 0, sizeof(*fsp)); fsp->lp = lport; fsp->xfer_ddp = FC_XID_UNKNOWN; - atomic_set(&fsp->ref_cnt, 1); + refcount_set(&fsp->ref_cnt, 1); init_timer(&fsp->timer); fsp->timer.data = (unsigned long)fsp; INIT_LIST_HEAD(&fsp->list); @@ -175,7 +175,7 @@ static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp) */ static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp) { - if (atomic_dec_and_test(&fsp->ref_cnt)) { + if (refcount_dec_and_test(&fsp->ref_cnt)) { struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp); mempool_free(fsp, si->scsi_pkt_pool); @@ -188,7 +188,7 @@ static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp) */ static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp) { - atomic_inc(&fsp->ref_cnt); + refcount_inc(&fsp->ref_cnt); } /** -- cgit v1.2.3