block: fix memleak of bio integrity data

[ 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@lst.de>
Signed-off-by Justin Tee <justin.tee@broadcom.com>

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

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/block/bio-integrity.c b/block/bio-integrity.c
index fb95dbb..bf62c25 100644 (file)
--- 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 906da35..94d6972 100644 (file)
--- 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 ffea169..ee3d566 100644 (file)
--- 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);