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Commit 72c6e7af authored by Mikulas Patocka's avatar Mikulas Patocka Committed by Alasdair G Kergon
Browse files

dm crypt: add missing error handling 



Always set io->error to -EIO when an error is detected in dm-crypt.

There were cases where an error code would be set only if we finish
processing the last sector. If there were other encryption operations in
flight, the error would be ignored and bio would be returned with
success as if no error happened.

This bug is present in kcryptd_crypt_write_convert, kcryptd_crypt_read_convert
and kcryptd_async_done.

Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
Cc: stable@kernel.org
Reviewed-by: default avatarMilan Broz <mbroz@redhat.com>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
parent aeb2deae

drivers/md/dm-crypt.c

+16 −12
Original line number Diff line number Diff line
@@ -1044,16 +1044,14 @@ static void kcryptd_queue_io(struct dm_crypt_io *io) 
	queue_work(cc->io_queue, &io->work);

}



static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io,

					  int error, int async)

static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async)

{

	struct bio *clone = io->ctx.bio_out;

	struct crypt_config *cc = io->target->private;



	if (unlikely(error < 0)) {

	if (unlikely(io->error < 0)) {

		crypt_free_buffer_pages(cc, clone);

		bio_put(clone);

		io->error = -EIO;

		crypt_dec_pending(io);

		return;

	}
@@ -1104,12 +1102,16 @@ static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) 
		sector += bio_sectors(clone);



		crypt_inc_pending(io);



		r = crypt_convert(cc, &io->ctx);

		if (r < 0)

			io->error = -EIO;



		crypt_finished = atomic_dec_and_test(&io->ctx.pending);



		/* Encryption was already finished, submit io now */

		if (crypt_finished) {

			kcryptd_crypt_write_io_submit(io, r, 0);

			kcryptd_crypt_write_io_submit(io, 0);



			/*

			 * If there was an error, do not try next fragments.
@@ -1160,11 +1162,8 @@ static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) 
	crypt_dec_pending(io);

}



static void kcryptd_crypt_read_done(struct dm_crypt_io *io, int error)

static void kcryptd_crypt_read_done(struct dm_crypt_io *io)

{

	if (unlikely(error < 0))

		io->error = -EIO;



	crypt_dec_pending(io);

}
@@ -1179,9 +1178,11 @@ static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) 
			   io->sector);



	r = crypt_convert(cc, &io->ctx);

	if (r < 0)

		io->error = -EIO;



	if (atomic_dec_and_test(&io->ctx.pending))

		kcryptd_crypt_read_done(io, r);

		kcryptd_crypt_read_done(io);



	crypt_dec_pending(io);

}
@@ -1202,15 +1203,18 @@ static void kcryptd_async_done(struct crypto_async_request *async_req, 
	if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post)

		error = cc->iv_gen_ops->post(cc, iv_of_dmreq(cc, dmreq), dmreq);



	if (error < 0)

		io->error = -EIO;



	mempool_free(req_of_dmreq(cc, dmreq), cc->req_pool);



	if (!atomic_dec_and_test(&ctx->pending))

		return;



	if (bio_data_dir(io->base_bio) == READ)

		kcryptd_crypt_read_done(io, error);

		kcryptd_crypt_read_done(io);

	else

		kcryptd_crypt_write_io_submit(io, error, 1);

		kcryptd_crypt_write_io_submit(io, 1);

}



static void kcryptd_crypt(struct work_struct *work)