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authorElena Reshetova <elena.reshetova@intel.com>2017-03-03 10:55:12 +0200
committerDavid Sterba <dsterba@suse.com>2017-04-18 14:07:23 +0200
commit490b54d6fb75f6ffd0471ec58bb38a992e2b40cd (patch)
treea7f431ea6a0f4369ba43be8736090efd54d6998b /include/trace
parent9b64f57ddf8673d29fafb3405d4aa1e93f5a4cd7 (diff)
downloadlinux-490b54d6fb75f6ffd0471ec58bb38a992e2b40cd.tar.gz
btrfs: convert extent_map.refs 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 Sterba <dsterba@suse.com>
Diffstat (limited to 'include/trace')
-rw-r--r--include/trace/events/btrfs.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h
index a3c3cab643a9..9dd29e806fed 100644
--- a/include/trace/events/btrfs.h
+++ b/include/trace/events/btrfs.h
@@ -213,7 +213,7 @@ TRACE_EVENT_CONDITION(btrfs_get_extent,
 		__entry->block_start	= map->block_start;
 		__entry->block_len	= map->block_len;
 		__entry->flags		= map->flags;
-		__entry->refs		= atomic_read(&map->refs);
+		__entry->refs		= refcount_read(&map->refs);
 		__entry->compress_type	= map->compress_type;
 	),