Re: [PATCH v4 2/5] virtio-crypto: use private buffer for control request

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Hi zhenwei,

url:    https://github.com/intel-lab-lkp/linux/commits/zhenwei-pi/virtio-crypto-Improve-performance/20220424-184732
base:   https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git master
config: i386-randconfig-m021 (https://download.01.org/0day-ci/archive/20220424/202204242344.JepUMdzP-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.2.0-20) 11.2.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

smatch warnings:
drivers/crypto/virtio/virtio_crypto_akcipher_algs.c:165 virtio_crypto_alg_akcipher_init_session() error: potentially dereferencing uninitialized 'input'.
drivers/crypto/virtio/virtio_crypto_akcipher_algs.c:230 virtio_crypto_alg_akcipher_close_session() error: uninitialized symbol 'vc_ctrl_req'.
drivers/crypto/virtio/virtio_crypto_akcipher_algs.c:232 virtio_crypto_alg_akcipher_close_session() error: potentially dereferencing uninitialized 'ctrl_status'.
drivers/crypto/virtio/virtio_crypto_akcipher_algs.c:232 virtio_crypto_alg_akcipher_close_session() error: potentially dereferencing uninitialized 'destroy_session'.

vim +/input +165 drivers/crypto/virtio/virtio_crypto_akcipher_algs.c

59ca6c93387d32 zhenwei pi 2022-03-02   99  static int virtio_crypto_alg_akcipher_init_session(struct virtio_crypto_akcipher_ctx *ctx,
59ca6c93387d32 zhenwei pi 2022-03-02  100  		struct virtio_crypto_ctrl_header *header, void *para,
59ca6c93387d32 zhenwei pi 2022-03-02  101  		const uint8_t *key, unsigned int keylen)
59ca6c93387d32 zhenwei pi 2022-03-02  102  {
59ca6c93387d32 zhenwei pi 2022-03-02  103  	struct scatterlist outhdr_sg, key_sg, inhdr_sg, *sgs[3];
59ca6c93387d32 zhenwei pi 2022-03-02  104  	struct virtio_crypto *vcrypto = ctx->vcrypto;
59ca6c93387d32 zhenwei pi 2022-03-02  105  	uint8_t *pkey;
59ca6c93387d32 zhenwei pi 2022-03-02  106  	unsigned int inlen;
59ca6c93387d32 zhenwei pi 2022-03-02  107  	int err;
59ca6c93387d32 zhenwei pi 2022-03-02  108  	unsigned int num_out = 0, num_in = 0;
bb26cab9a7c25d zhenwei pi 2022-04-24  109  	struct virtio_crypto_op_ctrl_req *ctrl;
bb26cab9a7c25d zhenwei pi 2022-04-24  110  	struct virtio_crypto_session_input *input;
286da9ed04239c zhenwei pi 2022-04-24  111  	struct virtio_crypto_ctrl_request *vc_ctrl_req;
59ca6c93387d32 zhenwei pi 2022-03-02  112  
59ca6c93387d32 zhenwei pi 2022-03-02  113  	pkey = kmemdup(key, keylen, GFP_ATOMIC);
59ca6c93387d32 zhenwei pi 2022-03-02  114  	if (!pkey)
59ca6c93387d32 zhenwei pi 2022-03-02  115  		return -ENOMEM;
59ca6c93387d32 zhenwei pi 2022-03-02  116  
286da9ed04239c zhenwei pi 2022-04-24  117  	vc_ctrl_req = kzalloc(sizeof(*vc_ctrl_req), GFP_KERNEL);
286da9ed04239c zhenwei pi 2022-04-24  118  	if (!vc_ctrl_req) {
286da9ed04239c zhenwei pi 2022-04-24  119  		err = -ENOMEM;
286da9ed04239c zhenwei pi 2022-04-24  120  		goto out;
286da9ed04239c zhenwei pi 2022-04-24  121  	}
286da9ed04239c zhenwei pi 2022-04-24  122  
286da9ed04239c zhenwei pi 2022-04-24  123  	ctrl = &vc_ctrl_req->ctrl;
bb26cab9a7c25d zhenwei pi 2022-04-24  124  	memcpy(&ctrl->header, header, sizeof(ctrl->header));
bb26cab9a7c25d zhenwei pi 2022-04-24  125  	memcpy(&ctrl->u, para, sizeof(ctrl->u));
286da9ed04239c zhenwei pi 2022-04-24  126  	input = &vc_ctrl_req->input;
bb26cab9a7c25d zhenwei pi 2022-04-24  127  	input->status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
59ca6c93387d32 zhenwei pi 2022-03-02  128  
bb26cab9a7c25d zhenwei pi 2022-04-24  129  	sg_init_one(&outhdr_sg, ctrl, sizeof(*ctrl));
59ca6c93387d32 zhenwei pi 2022-03-02  130  	sgs[num_out++] = &outhdr_sg;
59ca6c93387d32 zhenwei pi 2022-03-02  131  
59ca6c93387d32 zhenwei pi 2022-03-02  132  	sg_init_one(&key_sg, pkey, keylen);
59ca6c93387d32 zhenwei pi 2022-03-02  133  	sgs[num_out++] = &key_sg;
59ca6c93387d32 zhenwei pi 2022-03-02  134  
bb26cab9a7c25d zhenwei pi 2022-04-24  135  	sg_init_one(&inhdr_sg, input, sizeof(*input));
59ca6c93387d32 zhenwei pi 2022-03-02  136  	sgs[num_out + num_in++] = &inhdr_sg;
59ca6c93387d32 zhenwei pi 2022-03-02  137  
286da9ed04239c zhenwei pi 2022-04-24  138  	spin_lock(&vcrypto->ctrl_lock);
59ca6c93387d32 zhenwei pi 2022-03-02  139  	err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, num_in, vcrypto, GFP_ATOMIC);
286da9ed04239c zhenwei pi 2022-04-24  140  	if (err < 0) {
286da9ed04239c zhenwei pi 2022-04-24  141  		spin_unlock(&vcrypto->ctrl_lock);
59ca6c93387d32 zhenwei pi 2022-03-02  142  		goto out;
286da9ed04239c zhenwei pi 2022-04-24  143  	}
59ca6c93387d32 zhenwei pi 2022-03-02  144  
59ca6c93387d32 zhenwei pi 2022-03-02  145  	virtqueue_kick(vcrypto->ctrl_vq);
59ca6c93387d32 zhenwei pi 2022-03-02  146  	while (!virtqueue_get_buf(vcrypto->ctrl_vq, &inlen) &&
59ca6c93387d32 zhenwei pi 2022-03-02  147  	       !virtqueue_is_broken(vcrypto->ctrl_vq))
59ca6c93387d32 zhenwei pi 2022-03-02  148  		cpu_relax();
286da9ed04239c zhenwei pi 2022-04-24  149  	spin_unlock(&vcrypto->ctrl_lock);
59ca6c93387d32 zhenwei pi 2022-03-02  150  
bb26cab9a7c25d zhenwei pi 2022-04-24  151  	if (le32_to_cpu(input->status) != VIRTIO_CRYPTO_OK) {
59ca6c93387d32 zhenwei pi 2022-03-02  152  		err = -EINVAL;
59ca6c93387d32 zhenwei pi 2022-03-02  153  		goto out;
59ca6c93387d32 zhenwei pi 2022-03-02  154  	}
59ca6c93387d32 zhenwei pi 2022-03-02  155  
bb26cab9a7c25d zhenwei pi 2022-04-24  156  	ctx->session_id = le64_to_cpu(input->session_id);
59ca6c93387d32 zhenwei pi 2022-03-02  157  	ctx->session_valid = true;
59ca6c93387d32 zhenwei pi 2022-03-02  158  	err = 0;
59ca6c93387d32 zhenwei pi 2022-03-02  159  
59ca6c93387d32 zhenwei pi 2022-03-02  160  out:
286da9ed04239c zhenwei pi 2022-04-24  161  	kfree(vc_ctrl_req);
59ca6c93387d32 zhenwei pi 2022-03-02  162  	kfree_sensitive(pkey);
59ca6c93387d32 zhenwei pi 2022-03-02  163  
59ca6c93387d32 zhenwei pi 2022-03-02  164  	if (err < 0)
59ca6c93387d32 zhenwei pi 2022-03-02 @165  		pr_err("virtio_crypto: Create session failed status: %u\n",
bb26cab9a7c25d zhenwei pi 2022-04-24  166  			le32_to_cpu(input->status));

goto out is always suspicious.  "input" is not initialized.

59ca6c93387d32 zhenwei pi 2022-03-02  167  
59ca6c93387d32 zhenwei pi 2022-03-02  168  	return err;
59ca6c93387d32 zhenwei pi 2022-03-02  169  }
59ca6c93387d32 zhenwei pi 2022-03-02  170  
59ca6c93387d32 zhenwei pi 2022-03-02  171  static int virtio_crypto_alg_akcipher_close_session(struct virtio_crypto_akcipher_ctx *ctx)
59ca6c93387d32 zhenwei pi 2022-03-02  172  {
59ca6c93387d32 zhenwei pi 2022-03-02  173  	struct scatterlist outhdr_sg, inhdr_sg, *sgs[2];
59ca6c93387d32 zhenwei pi 2022-03-02  174  	struct virtio_crypto_destroy_session_req *destroy_session;
59ca6c93387d32 zhenwei pi 2022-03-02  175  	struct virtio_crypto *vcrypto = ctx->vcrypto;
59ca6c93387d32 zhenwei pi 2022-03-02  176  	unsigned int num_out = 0, num_in = 0, inlen;
59ca6c93387d32 zhenwei pi 2022-03-02  177  	int err;
bb26cab9a7c25d zhenwei pi 2022-04-24  178  	struct virtio_crypto_op_ctrl_req *ctrl;
bb26cab9a7c25d zhenwei pi 2022-04-24  179  	struct virtio_crypto_inhdr *ctrl_status;
286da9ed04239c zhenwei pi 2022-04-24  180  	struct virtio_crypto_ctrl_request *vc_ctrl_req;
59ca6c93387d32 zhenwei pi 2022-03-02  181  
59ca6c93387d32 zhenwei pi 2022-03-02  182  	if (!ctx->session_valid) {
59ca6c93387d32 zhenwei pi 2022-03-02  183  		err = 0;
59ca6c93387d32 zhenwei pi 2022-03-02  184  		goto out;
59ca6c93387d32 zhenwei pi 2022-03-02  185  	}
286da9ed04239c zhenwei pi 2022-04-24  186  
286da9ed04239c zhenwei pi 2022-04-24  187  	vc_ctrl_req = kzalloc(sizeof(*vc_ctrl_req), GFP_KERNEL);
286da9ed04239c zhenwei pi 2022-04-24  188  	if (!vc_ctrl_req) {
286da9ed04239c zhenwei pi 2022-04-24  189  		err = -ENOMEM;
286da9ed04239c zhenwei pi 2022-04-24  190  		goto out;
286da9ed04239c zhenwei pi 2022-04-24  191  	}
286da9ed04239c zhenwei pi 2022-04-24  192  
286da9ed04239c zhenwei pi 2022-04-24  193  	ctrl_status = &vc_ctrl_req->ctrl_status;
bb26cab9a7c25d zhenwei pi 2022-04-24  194  	ctrl_status->status = VIRTIO_CRYPTO_ERR;
286da9ed04239c zhenwei pi 2022-04-24  195  	ctrl = &vc_ctrl_req->ctrl;
bb26cab9a7c25d zhenwei pi 2022-04-24  196  	ctrl->header.opcode = cpu_to_le32(VIRTIO_CRYPTO_AKCIPHER_DESTROY_SESSION);
bb26cab9a7c25d zhenwei pi 2022-04-24  197  	ctrl->header.queue_id = 0;
59ca6c93387d32 zhenwei pi 2022-03-02  198  
bb26cab9a7c25d zhenwei pi 2022-04-24  199  	destroy_session = &ctrl->u.destroy_session;
59ca6c93387d32 zhenwei pi 2022-03-02  200  	destroy_session->session_id = cpu_to_le64(ctx->session_id);
59ca6c93387d32 zhenwei pi 2022-03-02  201  
bb26cab9a7c25d zhenwei pi 2022-04-24  202  	sg_init_one(&outhdr_sg, ctrl, sizeof(*ctrl));
59ca6c93387d32 zhenwei pi 2022-03-02  203  	sgs[num_out++] = &outhdr_sg;
59ca6c93387d32 zhenwei pi 2022-03-02  204  
bb26cab9a7c25d zhenwei pi 2022-04-24  205  	sg_init_one(&inhdr_sg, &ctrl_status->status, sizeof(ctrl_status->status));
59ca6c93387d32 zhenwei pi 2022-03-02  206  	sgs[num_out + num_in++] = &inhdr_sg;
59ca6c93387d32 zhenwei pi 2022-03-02  207  
286da9ed04239c zhenwei pi 2022-04-24  208  	spin_lock(&vcrypto->ctrl_lock);
59ca6c93387d32 zhenwei pi 2022-03-02  209  	err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, num_in, vcrypto, GFP_ATOMIC);
286da9ed04239c zhenwei pi 2022-04-24  210  	if (err < 0) {
286da9ed04239c zhenwei pi 2022-04-24  211  		spin_unlock(&vcrypto->ctrl_lock);
59ca6c93387d32 zhenwei pi 2022-03-02  212  		goto out;
286da9ed04239c zhenwei pi 2022-04-24  213  	}
59ca6c93387d32 zhenwei pi 2022-03-02  214  
59ca6c93387d32 zhenwei pi 2022-03-02  215  	virtqueue_kick(vcrypto->ctrl_vq);
59ca6c93387d32 zhenwei pi 2022-03-02  216  	while (!virtqueue_get_buf(vcrypto->ctrl_vq, &inlen) &&
59ca6c93387d32 zhenwei pi 2022-03-02  217  	       !virtqueue_is_broken(vcrypto->ctrl_vq))
59ca6c93387d32 zhenwei pi 2022-03-02  218  		cpu_relax();
286da9ed04239c zhenwei pi 2022-04-24  219  	spin_unlock(&vcrypto->ctrl_lock);
59ca6c93387d32 zhenwei pi 2022-03-02  220  
bb26cab9a7c25d zhenwei pi 2022-04-24  221  	if (ctrl_status->status != VIRTIO_CRYPTO_OK) {
59ca6c93387d32 zhenwei pi 2022-03-02  222  		err = -EINVAL;
59ca6c93387d32 zhenwei pi 2022-03-02  223  		goto out;
59ca6c93387d32 zhenwei pi 2022-03-02  224  	}
59ca6c93387d32 zhenwei pi 2022-03-02  225  
59ca6c93387d32 zhenwei pi 2022-03-02  226  	err = 0;
59ca6c93387d32 zhenwei pi 2022-03-02  227  	ctx->session_valid = false;
59ca6c93387d32 zhenwei pi 2022-03-02  228  
59ca6c93387d32 zhenwei pi 2022-03-02  229  out:
286da9ed04239c zhenwei pi 2022-04-24 @230  	kfree(vc_ctrl_req);
59ca6c93387d32 zhenwei pi 2022-03-02  231  	if (err < 0) {
59ca6c93387d32 zhenwei pi 2022-03-02 @232  		pr_err("virtio_crypto: Close session failed status: %u, session_id: 0x%llx\n",
bb26cab9a7c25d zhenwei pi 2022-04-24  233  			ctrl_status->status, destroy_session->session_id);

More canonical goto out bugs.

59ca6c93387d32 zhenwei pi 2022-03-02  234  	}
59ca6c93387d32 zhenwei pi 2022-03-02  235  
59ca6c93387d32 zhenwei pi 2022-03-02  236  	return err;
59ca6c93387d32 zhenwei pi 2022-03-02  237  }

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