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block: fix memleak of bio integrity data 

7c20f11680 ("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 7c20f11680.

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

Fixes: 7c20f11680 ("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>
This commit is contained in:
Justin Tee 2019-12-05 10:09:01 +08:00 committed by Jens Axboe
parent 08802ed665
commit ece841abbe
3 changed files with 8 additions and 1 deletions
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2
block/bio-integrity.c
View File

@ -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;

3
block/bio.c
View File

@ -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);

4
block/blk.h
View File

@ -121,6 +121,7 @@ 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))
@ -166,6 +167,9 @@ 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);