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[PATCH 2/5] fs, xfs: convert xfs_efi_log_item.efi_refcount 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>
---
 fs/xfs/xfs_extfree_item.c | 4 ++--
 fs/xfs/xfs_extfree_item.h | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/xfs/xfs_extfree_item.c b/fs/xfs/xfs_extfree_item.c
index d7bc149..4e0acf0 100644
--- a/fs/xfs/xfs_extfree_item.c
+++ b/fs/xfs/xfs_extfree_item.c
@@ -220,7 +220,7 @@ xfs_efi_init(
 	efip->efi_format.efi_nextents = nextents;
 	efip->efi_format.efi_id = (uintptr_t)(void *)efip;
 	atomic_set(&efip->efi_next_extent, 0);
-	atomic_set(&efip->efi_refcount, 2);
+	refcount_set(&efip->efi_refcount, 2);
 
 	return efip;
 }
@@ -290,7 +290,7 @@ void
 xfs_efi_release(
 	struct xfs_efi_log_item	*efip)
 {
-	if (atomic_dec_and_test(&efip->efi_refcount)) {
+	if (refcount_dec_and_test(&efip->efi_refcount)) {
 		xfs_trans_ail_remove(&efip->efi_item, SHUTDOWN_LOG_IO_ERROR);
 		xfs_efi_item_free(efip);
 	}
diff --git a/fs/xfs/xfs_extfree_item.h b/fs/xfs/xfs_extfree_item.h
index a32c794..fadf736 100644
--- a/fs/xfs/xfs_extfree_item.h
+++ b/fs/xfs/xfs_extfree_item.h
@@ -64,7 +64,7 @@ struct kmem_zone;
  */
 typedef struct xfs_efi_log_item {
 	xfs_log_item_t		efi_item;
-	atomic_t		efi_refcount;
+	refcount_t		efi_refcount;
 	atomic_t		efi_next_extent;
 	unsigned long		efi_flags;	/* misc flags */
 	xfs_efi_log_format_t	efi_format;
-- 
2.7.4

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[PATCH 0/5] fs, xfs refcount conversions Elena Reshetova <elena.reshetova@intel.com> - 2017-03-08 10:00 +0100
  [PATCH 5/5] fs, xfs: convert xfs_rui_log_item.rui_refcount from atomic_t to refcount_t Elena Reshetova <elena.reshetova@intel.com> - 2017-03-08 10:00 +0100
  [PATCH 1/5] fs, xfs: convert xfs_bui_log_item.bui_refcount from atomic_t to refcount_t Elena Reshetova <elena.reshetova@intel.com> - 2017-03-08 10:00 +0100
  [PATCH 2/5] fs, xfs: convert xfs_efi_log_item.efi_refcount from atomic_t to refcount_t Elena Reshetova <elena.reshetova@intel.com> - 2017-03-08 10:00 +0100
  [PATCH 3/5] fs, xfs: convert xlog_ticket.t_ref from atomic_t to refcount_t Elena Reshetova <elena.reshetova@intel.com> - 2017-03-08 12:40 +0100
    Re: [PATCH 3/5] fs, xfs: convert xlog_ticket.t_ref from atomic_t to  refcount_t Christoph Hellwig <hch@infradead.org> - 2017-03-08 17:00 +0100
      Re: [PATCH 3/5] fs, xfs: convert xlog_ticket.t_ref from atomic_t to refcount_t Kees Cook <keescook@chromium.org> - 2017-03-08 23:10 +0100
        RE: [PATCH 3/5] fs, xfs: convert xlog_ticket.t_ref from atomic_t to  refcount_t "Reshetova, Elena" <elena.reshetova@intel.com> - 2017-03-09 08:00 +0100
  [PATCH 4/5] fs, xfs: convert xfs_cui_log_item.cui_refcount from atomic_t to refcount_t Elena Reshetova <elena.reshetova@intel.com> - 2017-03-08 15:40 +0100

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