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scsi: libfc: convert fc_fcp_pkt.ref_cnt 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 <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>
Acked-by: Johannes Thumshirn <jth@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Elena Reshetova 2017-03-09 09:44:02 +02:00 • committed by Martin K. Petersen
parent fb5fe0fd62
commit 22c70d1a9c
2 changed files with 5 additions and 4 deletions
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3
include/scsi/libfc.h
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@ -23,6 +23,7 @@
#include <linux/timer.h>
#include <linux/if.h>
#include <linux/percpu.h>
#include <linux/refcount.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_fc.h>
@ -321,7 +322,7 @@ struct fc_seq_els_data {
*/
struct fc_fcp_pkt {
spinlock_t scsi_pkt_lock;
atomic_t ref_cnt;
refcount_t ref_cnt;
/* SCSI command and data transfer information */
u32 data_len;