drivers/crypto/mxs-dcp.c:292 mxs_dcp_run_aes() error: uninitialized symbol 'key_phys'.
From: Dan Carpenter
Date: Mon May 27 2024 - 03:49:29 EST
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: c13320499ba0efd93174ef6462ae8a7a2933f6e7
commit: 3d16af0b4cfac4b2c3b238e2ec37b38c2f316978 crypto: mxs-dcp: Add support for hardware-bound keys
config: arm-randconfig-r071-20240524 (https://download.01.org/0day-ci/archive/20240527/202405270146.Y9tPoil8-lkp@xxxxxxxxx/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project 7aa382fd7257d9bd4f7fc50bb7078a3c26a1628c)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
| Closes: https://lore.kernel.org/r/202405270146.Y9tPoil8-lkp@xxxxxxxxx/
smatch warnings:
drivers/crypto/mxs-dcp.c:292 mxs_dcp_run_aes() error: uninitialized symbol 'key_phys'.
vim +/key_phys +292 drivers/crypto/mxs-dcp.c
2021abaa00da64a Marek Vasut 2014-01-14 225 static int mxs_dcp_run_aes(struct dcp_async_ctx *actx,
9acb3247e0e1d94 Ard Biesheuvel 2019-11-09 226 struct skcipher_request *req, int init)
15b59e7c3733f90 Marek Vasut 2013-12-10 227 {
df6313d707e575a Sean Anderson 2021-07-01 228 dma_addr_t key_phys, src_phys, dst_phys;
15b59e7c3733f90 Marek Vasut 2013-12-10 229 struct dcp *sdcp = global_sdcp;
15b59e7c3733f90 Marek Vasut 2013-12-10 230 struct dcp_dma_desc *desc = &sdcp->coh->desc[actx->chan];
9acb3247e0e1d94 Ard Biesheuvel 2019-11-09 231 struct dcp_aes_req_ctx *rctx = skcipher_request_ctx(req);
3d16af0b4cfac4b David Gstir 2024-04-03 232 bool key_referenced = actx->key_referenced;
15b59e7c3733f90 Marek Vasut 2013-12-10 233 int ret;
15b59e7c3733f90 Marek Vasut 2013-12-10 234
3d16af0b4cfac4b David Gstir 2024-04-03 235 if (!key_referenced) {
df6313d707e575a Sean Anderson 2021-07-01 236 key_phys = dma_map_single(sdcp->dev, sdcp->coh->aes_key,
df6313d707e575a Sean Anderson 2021-07-01 237 2 * AES_KEYSIZE_128, DMA_TO_DEVICE);
df6313d707e575a Sean Anderson 2021-07-01 238 ret = dma_mapping_error(sdcp->dev, key_phys);
df6313d707e575a Sean Anderson 2021-07-01 239 if (ret)
df6313d707e575a Sean Anderson 2021-07-01 240 return ret;
3d16af0b4cfac4b David Gstir 2024-04-03 241 }
key_phys not initialized on else path.
df6313d707e575a Sean Anderson 2021-07-01 242
df6313d707e575a Sean Anderson 2021-07-01 243 src_phys = dma_map_single(sdcp->dev, sdcp->coh->aes_in_buf,
15b59e7c3733f90 Marek Vasut 2013-12-10 244 DCP_BUF_SZ, DMA_TO_DEVICE);
df6313d707e575a Sean Anderson 2021-07-01 245 ret = dma_mapping_error(sdcp->dev, src_phys);
df6313d707e575a Sean Anderson 2021-07-01 246 if (ret)
df6313d707e575a Sean Anderson 2021-07-01 247 goto err_src;
df6313d707e575a Sean Anderson 2021-07-01 248
df6313d707e575a Sean Anderson 2021-07-01 249 dst_phys = dma_map_single(sdcp->dev, sdcp->coh->aes_out_buf,
15b59e7c3733f90 Marek Vasut 2013-12-10 250 DCP_BUF_SZ, DMA_FROM_DEVICE);
df6313d707e575a Sean Anderson 2021-07-01 251 ret = dma_mapping_error(sdcp->dev, dst_phys);
df6313d707e575a Sean Anderson 2021-07-01 252 if (ret)
df6313d707e575a Sean Anderson 2021-07-01 253 goto err_dst;
15b59e7c3733f90 Marek Vasut 2013-12-10 254
fadd7a6e616b89c Radu Solea 2018-10-02 255 if (actx->fill % AES_BLOCK_SIZE) {
fadd7a6e616b89c Radu Solea 2018-10-02 256 dev_err(sdcp->dev, "Invalid block size!\n");
fadd7a6e616b89c Radu Solea 2018-10-02 257 ret = -EINVAL;
fadd7a6e616b89c Radu Solea 2018-10-02 258 goto aes_done_run;
fadd7a6e616b89c Radu Solea 2018-10-02 259 }
fadd7a6e616b89c Radu Solea 2018-10-02 260
15b59e7c3733f90 Marek Vasut 2013-12-10 261 /* Fill in the DMA descriptor. */
15b59e7c3733f90 Marek Vasut 2013-12-10 262 desc->control0 = MXS_DCP_CONTROL0_DECR_SEMAPHORE |
15b59e7c3733f90 Marek Vasut 2013-12-10 263 MXS_DCP_CONTROL0_INTERRUPT |
15b59e7c3733f90 Marek Vasut 2013-12-10 264 MXS_DCP_CONTROL0_ENABLE_CIPHER;
15b59e7c3733f90 Marek Vasut 2013-12-10 265
3d16af0b4cfac4b David Gstir 2024-04-03 266 if (key_referenced)
3d16af0b4cfac4b David Gstir 2024-04-03 267 /* Set OTP key bit to select the key via KEY_SELECT. */
3d16af0b4cfac4b David Gstir 2024-04-03 268 desc->control0 |= MXS_DCP_CONTROL0_OTP_KEY;
3d16af0b4cfac4b David Gstir 2024-04-03 269 else
15b59e7c3733f90 Marek Vasut 2013-12-10 270 /* Payload contains the key. */
15b59e7c3733f90 Marek Vasut 2013-12-10 271 desc->control0 |= MXS_DCP_CONTROL0_PAYLOAD_KEY;
15b59e7c3733f90 Marek Vasut 2013-12-10 272
2021abaa00da64a Marek Vasut 2014-01-14 273 if (rctx->enc)
15b59e7c3733f90 Marek Vasut 2013-12-10 274 desc->control0 |= MXS_DCP_CONTROL0_CIPHER_ENCRYPT;
15b59e7c3733f90 Marek Vasut 2013-12-10 275 if (init)
15b59e7c3733f90 Marek Vasut 2013-12-10 276 desc->control0 |= MXS_DCP_CONTROL0_CIPHER_INIT;
15b59e7c3733f90 Marek Vasut 2013-12-10 277
15b59e7c3733f90 Marek Vasut 2013-12-10 278 desc->control1 = MXS_DCP_CONTROL1_CIPHER_SELECT_AES128;
15b59e7c3733f90 Marek Vasut 2013-12-10 279
2021abaa00da64a Marek Vasut 2014-01-14 280 if (rctx->ecb)
15b59e7c3733f90 Marek Vasut 2013-12-10 281 desc->control1 |= MXS_DCP_CONTROL1_CIPHER_MODE_ECB;
15b59e7c3733f90 Marek Vasut 2013-12-10 282 else
15b59e7c3733f90 Marek Vasut 2013-12-10 283 desc->control1 |= MXS_DCP_CONTROL1_CIPHER_MODE_CBC;
15b59e7c3733f90 Marek Vasut 2013-12-10 284
3d16af0b4cfac4b David Gstir 2024-04-03 285 if (key_referenced)
3d16af0b4cfac4b David Gstir 2024-04-03 286 desc->control1 |= sdcp->coh->aes_key[0] << MXS_DCP_CONTROL1_KEY_SELECT_SHIFT;
3d16af0b4cfac4b David Gstir 2024-04-03 287
15b59e7c3733f90 Marek Vasut 2013-12-10 288 desc->next_cmd_addr = 0;
15b59e7c3733f90 Marek Vasut 2013-12-10 289 desc->source = src_phys;
15b59e7c3733f90 Marek Vasut 2013-12-10 290 desc->destination = dst_phys;
15b59e7c3733f90 Marek Vasut 2013-12-10 291 desc->size = actx->fill;
15b59e7c3733f90 Marek Vasut 2013-12-10 @292 desc->payload = key_phys;
^^^^^^^^
Uninitialized.
15b59e7c3733f90 Marek Vasut 2013-12-10 293 desc->status = 0;
15b59e7c3733f90 Marek Vasut 2013-12-10 294
15b59e7c3733f90 Marek Vasut 2013-12-10 295 ret = mxs_dcp_start_dma(actx);
15b59e7c3733f90 Marek Vasut 2013-12-10 296
fadd7a6e616b89c Radu Solea 2018-10-02 297 aes_done_run:
df6313d707e575a Sean Anderson 2021-07-01 298 dma_unmap_single(sdcp->dev, dst_phys, DCP_BUF_SZ, DMA_FROM_DEVICE);
df6313d707e575a Sean Anderson 2021-07-01 299 err_dst:
df6313d707e575a Sean Anderson 2021-07-01 300 dma_unmap_single(sdcp->dev, src_phys, DCP_BUF_SZ, DMA_TO_DEVICE);
df6313d707e575a Sean Anderson 2021-07-01 301 err_src:
3d16af0b4cfac4b David Gstir 2024-04-03 302 if (!key_referenced)
15b59e7c3733f90 Marek Vasut 2013-12-10 303 dma_unmap_single(sdcp->dev, key_phys, 2 * AES_KEYSIZE_128,
15b59e7c3733f90 Marek Vasut 2013-12-10 304 DMA_TO_DEVICE);
15b59e7c3733f90 Marek Vasut 2013-12-10 305 return ret;
15b59e7c3733f90 Marek Vasut 2013-12-10 306 }
--
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