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Date: Fri, 3 Mar 2017 10:55:25 +0200
From: Elena Reshetova <elena.reshetova@...el.com>
To: linux-kernel@...r.kernel.org
Cc: linux-fsdevel@...r.kernel.org, linux-btrfs@...r.kernel.org,
peterz@...radead.org, gregkh@...uxfoundation.org, jbacik@...com,
clm@...com, dsterba@...e.com,
Elena Reshetova <elena.reshetova@...el.com>,
Hans Liljestrand <ishkamiel@...il.com>,
Kees Cook <keescook@...omium.org>,
David Windsor <dwindsor@...il.com>
Subject: [PATCH 16/17] fs, btrfs: convert scrub_ctx.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@...el.com>
Signed-off-by: Hans Liljestrand <ishkamiel@...il.com>
Signed-off-by: Kees Cook <keescook@...omium.org>
Signed-off-by: David Windsor <dwindsor@...il.com>
---
fs/btrfs/scrub.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 4d15112..ace634e 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -202,7 +202,7 @@ struct scrub_ctx {
* doesn't free the scrub context before or while the workers are
* doing the wakeup() call.
*/
- atomic_t refs;
+ refcount_t refs;
};
struct scrub_fixup_nodatasum {
@@ -305,7 +305,7 @@ static void scrub_put_ctx(struct scrub_ctx *sctx);
static void scrub_pending_bio_inc(struct scrub_ctx *sctx)
{
- atomic_inc(&sctx->refs);
+ refcount_inc(&sctx->refs);
atomic_inc(&sctx->bios_in_flight);
}
@@ -356,7 +356,7 @@ static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx)
{
struct btrfs_fs_info *fs_info = sctx->fs_info;
- atomic_inc(&sctx->refs);
+ refcount_inc(&sctx->refs);
/*
* increment scrubs_running to prevent cancel requests from
* completing as long as a worker is running. we must also
@@ -447,7 +447,7 @@ static noinline_for_stack void scrub_free_ctx(struct scrub_ctx *sctx)
static void scrub_put_ctx(struct scrub_ctx *sctx)
{
- if (atomic_dec_and_test(&sctx->refs))
+ if (refcount_dec_and_test(&sctx->refs))
scrub_free_ctx(sctx);
}
@@ -462,7 +462,7 @@ struct scrub_ctx *scrub_setup_ctx(struct btrfs_device *dev, int is_dev_replace)
sctx = kzalloc(sizeof(*sctx), GFP_KERNEL);
if (!sctx)
goto nomem;
- atomic_set(&sctx->refs, 1);
+ refcount_set(&sctx->refs, 1);
sctx->is_dev_replace = is_dev_replace;
sctx->pages_per_rd_bio = SCRUB_PAGES_PER_RD_BIO;
sctx->curr = -1;
--
2.7.4
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