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| author | Elena Reshetova <elena.reshetova@intel.com> | 2017-03-03 10:55:24 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2017-04-18 14:07:24 +0200 |
| commit | 78a764504d1e11411bec0e068c5d9e0a417aff08 (patch) | |
| tree | 77b509048702328785181bfe84a3845c85a8acc2 /fs | |
| parent | 186debd6ede29da9d51cffdb93cadee66e4e1e23 (diff) | |
| download | linux-stable-78a764504d1e11411bec0e068c5d9e0a417aff08.tar.gz linux-stable-78a764504d1e11411bec0e068c5d9e0a417aff08.tar.bz2 linux-stable-78a764504d1e11411bec0e068c5d9e0a417aff08.zip | |
btrfs: convert scrub_parity.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 'fs')
| -rw-r--r-- | fs/btrfs/scrub.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c index d2c35848e61d..8130ab11821f 100644 --- a/fs/btrfs/scrub.c +++ b/fs/btrfs/scrub.c @@ -142,7 +142,7 @@ struct scrub_parity { int stripe_len; - atomic_t refs; + refcount_t refs; struct list_head spages; @@ -2822,12 +2822,12 @@ static inline int scrub_calc_parity_bitmap_len(int nsectors) static void scrub_parity_get(struct scrub_parity *sparity) { - atomic_inc(&sparity->refs); + refcount_inc(&sparity->refs); } static void scrub_parity_put(struct scrub_parity *sparity) { - if (!atomic_dec_and_test(&sparity->refs)) + if (!refcount_dec_and_test(&sparity->refs)) return; scrub_parity_check_and_repair(sparity); @@ -2879,7 +2879,7 @@ static noinline_for_stack int scrub_raid56_parity(struct scrub_ctx *sctx, sparity->scrub_dev = sdev; sparity->logic_start = logic_start; sparity->logic_end = logic_end; - atomic_set(&sparity->refs, 1); + refcount_set(&sparity->refs, 1); INIT_LIST_HEAD(&sparity->spages); sparity->dbitmap = sparity->bitmap; sparity->ebitmap = (void *)sparity->bitmap + bitmap_len; |