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btrfs: convert scrub_parity.refs 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>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Elena Reshetova 2017-03-03 10:55:24 +02:00 committed by David Sterba
parent 186debd6ed
commit 78a764504d
1 changed files with 4 additions and 4 deletions
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8
fs/btrfs/scrub.c
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@ -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;