From: Justin Tee Date: Thu, 5 Dec 2019 02:09:01 +0000 (+0800) Subject: block: fix memleak of bio integrity data X-Git-Tag: v5.5-rc1~29^2~1 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=ece841abbed2da71fa10710c687c9ce9efb6bf69;p=linux.git block: fix memleak of bio integrity data 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 Signed-off-by Justin Tee Add commit log, and simplify/fix the original patch wroten by Justin. Signed-off-by: Ming Lei Signed-off-by: Jens Axboe --- diff --git a/block/bio-integrity.c b/block/bio-integrity.c index fb95dbb21dd8..bf62c25cde8f 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 b1170ec18464..9d54aa37ce6c 100644 --- a/block/bio.c +++ b/block/bio.c @@ -233,6 +233,9 @@ struct bio_vec *bvec_alloc(gfp_t gfp_mask, int nr, unsigned long *idx, 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 2bea40180b6f..6842f28c033e 100644 --- a/block/blk.h +++ b/block/blk.h @@ -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);