blk_crypto_profile_init() calls lockdep_register_key(), which warns and does not register if the provided memory is a static object. blk-crypto-fallback currently has a static blk_crypto_profile and calls blk_crypto_profile_init() thereupon, resulting in the warning and failure to register.

Fortunately it is simple enough to use a dynamically allocated profile and make lockdep function correctly.

Fixes: 2fb48d88e77f ("blk-crypto: use dynamic lock class for blk_crypto_profile::lock") Cc: stable@vger.kernel.org Signed-off-by: Sweet Tea Dorminy sweettea-kernel@dorminy.me --- v5: added correct error return if allocation fails. v4: removed a stray change introduced in v3. v3: added allocation error checking as noted by Eric Biggers. v2: reworded commit message, fixed Fixes tag, as pointed out by Eric Biggers.

block/blk-crypto-fallback.c | 36 +++++++++++++++++++++++------------- 1 file changed, 23 insertions(+), 13 deletions(-)

diff --git a/block/blk-crypto-fallback.c b/block/blk-crypto-fallback.c index ad9844c5b40c..e6468eab2681 100644 --- a/block/blk-crypto-fallback.c +++ b/block/blk-crypto-fallback.c @@ -78,7 +78,7 @@ static struct blk_crypto_fallback_keyslot { struct crypto_skcipher *tfms[BLK_ENCRYPTION_MODE_MAX]; } *blk_crypto_keyslots;

-static struct blk_crypto_profile blk_crypto_fallback_profile; +static struct blk_crypto_profile *blk_crypto_fallback_profile; static struct workqueue_struct *blk_crypto_wq; static mempool_t *blk_crypto_bounce_page_pool; static struct bio_set crypto_bio_split; @@ -292,7 +292,7 @@ static bool blk_crypto_fallback_encrypt_bio(struct bio **bio_ptr) * Get a blk-crypto-fallback keyslot that contains a crypto_skcipher for * this bio's algorithm and key. */ - blk_st = blk_crypto_get_keyslot(&blk_crypto_fallback_profile, + blk_st = blk_crypto_get_keyslot(blk_crypto_fallback_profile, bc->bc_key, &slot); if (blk_st != BLK_STS_OK) { src_bio->bi_status = blk_st; @@ -395,7 +395,7 @@ static void blk_crypto_fallback_decrypt_bio(struct work_struct *work) * Get a blk-crypto-fallback keyslot that contains a crypto_skcipher for * this bio's algorithm and key. */ - blk_st = blk_crypto_get_keyslot(&blk_crypto_fallback_profile, + blk_st = blk_crypto_get_keyslot(blk_crypto_fallback_profile, bc->bc_key, &slot); if (blk_st != BLK_STS_OK) { bio->bi_status = blk_st; @@ -499,7 +499,7 @@ bool blk_crypto_fallback_bio_prep(struct bio **bio_ptr) return false; }

- if (!__blk_crypto_cfg_supported(&blk_crypto_fallback_profile, + if (!__blk_crypto_cfg_supported(blk_crypto_fallback_profile, &bc->bc_key->crypto_cfg)) { bio->bi_status = BLK_STS_NOTSUPP; return false; @@ -526,7 +526,7 @@ bool blk_crypto_fallback_bio_prep(struct bio **bio_ptr)

int blk_crypto_fallback_evict_key(const struct blk_crypto_key *key) { - return __blk_crypto_evict_key(&blk_crypto_fallback_profile, key); + return __blk_crypto_evict_key(blk_crypto_fallback_profile, key); }

static bool blk_crypto_fallback_inited; @@ -534,7 +534,6 @@ static int blk_crypto_fallback_init(void) { int i; int err; - struct blk_crypto_profile *profile = &blk_crypto_fallback_profile;

if (blk_crypto_fallback_inited) return 0; @@ -545,18 +544,27 @@ static int blk_crypto_fallback_init(void) if (err) goto out;

- err = blk_crypto_profile_init(profile, blk_crypto_num_keyslots); - if (err) + /* Dynamic allocation is needed because of lockdep_register_key(). */ + blk_crypto_fallback_profile = + kzalloc(sizeof(*blk_crypto_fallback_profile), GFP_KERNEL); + if (!blk_crypto_fallback_profile) { + err = -ENOMEM; goto fail_free_bioset; + } + + err = blk_crypto_profile_init(blk_crypto_fallback_profile, + blk_crypto_num_keyslots); + if (err) + goto fail_free_profile; err = -ENOMEM;

- profile->ll_ops = blk_crypto_fallback_ll_ops; - profile->max_dun_bytes_supported = BLK_CRYPTO_MAX_IV_SIZE; + blk_crypto_fallback_profile->ll_ops = blk_crypto_fallback_ll_ops; + blk_crypto_fallback_profile->max_dun_bytes_supported = BLK_CRYPTO_MAX_IV_SIZE;

/* All blk-crypto modes have a crypto API fallback. */ for (i = 0; i < BLK_ENCRYPTION_MODE_MAX; i++) - profile->modes_supported[i] = 0xFFFFFFFF; - profile->modes_supported[BLK_ENCRYPTION_MODE_INVALID] = 0; + blk_crypto_fallback_profile->modes_supported[i] = 0xFFFFFFFF; + blk_crypto_fallback_profile->modes_supported[BLK_ENCRYPTION_MODE_INVALID] = 0;

blk_crypto_wq = alloc_workqueue("blk_crypto_wq", WQ_UNBOUND | WQ_HIGHPRI | @@ -597,7 +605,9 @@ static int blk_crypto_fallback_init(void) fail_free_wq: destroy_workqueue(blk_crypto_wq); fail_destroy_profile: - blk_crypto_profile_destroy(profile); + blk_crypto_profile_destroy(blk_crypto_fallback_profile); +fail_free_profile: + kfree(blk_crypto_fallback_profile); fail_free_bioset: bioset_exit(&crypto_bio_split); out: