linux-kernel - [PATCH 5.4 097/102] block: fix memleak of bio integrity data

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Date:   Fri, 24 Jan 2020 10:31:38 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Ming Lei <ming.lei@...hat.com>, Jens Axboe <axboe@...nel.dk>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 097/102] block: fix memleak of bio integrity data

From: Justin Tee <justin.tee@...adcom.com>

[ Upstream commit ece841abbed2da71fa10710c687c9ce9efb6bf69 ]

7c20f11680a4 ("bio-integrity: stop abusing bi_end_io") moves
bio_integrity_free from bio_uninit() to bio_integrity_verify_fn()
and bio_endio(). This way looks wrong because bio may be freed
without calling bio_endio(), for example, blk_rq_unprep_clone() is
called from dm_mq_queue_rq() when the underlying queue of dm-mpath
is busy.

So memory leak of bio integrity data is caused by commit 7c20f11680a4.

Fixes this issue by re-adding bio_integrity_free() to bio_uninit().

Fixes: 7c20f11680a4 ("bio-integrity: stop abusing bi_end_io")
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by Justin Tee <justin.tee@...adcom.com>

Add commit log, and simplify/fix the original patch wroten by Justin.

Signed-off-by: Ming Lei <ming.lei@...hat.com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 block/bio-integrity.c | 2 +-
 block/bio.c           | 3 +++
 block/blk.h           | 4 ++++
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/block/bio-integrity.c b/block/bio-integrity.c
index fb95dbb21dd88..bf62c25cde8f4 100644
--- a/block/bio-integrity.c
+++ b/block/bio-integrity.c
@@ -87,7 +87,7 @@ EXPORT_SYMBOL(bio_integrity_alloc);
  * Description: Used to free the integrity portion of a bio. Usually
  * called from bio_free().
  */
-static void bio_integrity_free(struct bio *bio)
+void bio_integrity_free(struct bio *bio)
 {
 	struct bio_integrity_payload *bip = bio_integrity(bio);
 	struct bio_set *bs = bio->bi_pool;
diff --git a/block/bio.c b/block/bio.c
index 906da3581a3e8..94d697217887a 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -233,6 +233,9 @@ fallback:
 void bio_uninit(struct bio *bio)
 {
 	bio_disassociate_blkg(bio);
+
+	if (bio_integrity(bio))
+		bio_integrity_free(bio);
 }
 EXPORT_SYMBOL(bio_uninit);
 
diff --git a/block/blk.h b/block/blk.h
index ffea1691470e6..ee3d5664d9627 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -122,6 +122,7 @@ static inline void blk_rq_bio_prep(struct request *rq, struct bio *bio,
 #ifdef CONFIG_BLK_DEV_INTEGRITY
 void blk_flush_integrity(void);
 bool __bio_integrity_endio(struct bio *);
+void bio_integrity_free(struct bio *bio);
 static inline bool bio_integrity_endio(struct bio *bio)
 {
 	if (bio_integrity(bio))
@@ -167,6 +168,9 @@ static inline bool bio_integrity_endio(struct bio *bio)
 {
 	return true;
 }
+static inline void bio_integrity_free(struct bio *bio)
+{
+}
 #endif /* CONFIG_BLK_DEV_INTEGRITY */
 
 unsigned long blk_rq_timeout(unsigned long timeout);
-- 
2.20.1