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Date: Wed, 29 May 2024 17:32:16 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: oe-kbuild@...ts.linux.dev, Christian Marangi <ansuelsmth@...il.com>,
Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Jacek Anaszewski <jacek.anaszewski@...il.com>,
linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: lkp@...el.com, oe-kbuild-all@...ts.linux.dev,
Christian Marangi <ansuelsmth@...il.com>
Subject: Re: [PATCH v3 3/3] leds: leds-lp5569: Add support for Texas
Instruments LP5569
Hi Christian,
kernel test robot noticed the following build warnings:
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Christian-Marangi/dt-bindings-leds-lp55xx-Add-new-ti-lp5569-compatible/20240527-174959
base: https://git.kernel.org/pub/scm/linux/kernel/git/lee/leds.git for-leds-next
patch link: https://lore.kernel.org/r/20240527094737.13354-3-ansuelsmth%40gmail.com
patch subject: [PATCH v3 3/3] leds: leds-lp5569: Add support for Texas Instruments LP5569
config: sparc-randconfig-r071-20240528 (https://download.01.org/0day-ci/archive/20240528/202405280611.QUICzlRj-lkp@intel.com/config)
compiler: sparc-linux-gcc (GCC) 13.2.0
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@...el.com>
| Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
| Closes: https://lore.kernel.org/r/202405280611.QUICzlRj-lkp@intel.com/
New smatch warnings:
drivers/leds/leds-lp5569.c:378 lp5569_update_program_memory() error: buffer overflow 'pattern' 128 <= 223
vim +/pattern +378 drivers/leds/leds-lp5569.c
ed7ae4f43e228c Christian Marangi 2024-05-27 340 static int lp5569_update_program_memory(struct lp55xx_chip *chip,
ed7ae4f43e228c Christian Marangi 2024-05-27 341 const u8 *data, size_t size)
ed7ae4f43e228c Christian Marangi 2024-05-27 342 {
ed7ae4f43e228c Christian Marangi 2024-05-27 343 enum lp55xx_engine_index idx = chip->engine_idx;
ed7ae4f43e228c Christian Marangi 2024-05-27 344 u8 pattern[LP5569_PROGRAM_LENGTH] = {0};
ed7ae4f43e228c Christian Marangi 2024-05-27 345 unsigned int cmd;
ed7ae4f43e228c Christian Marangi 2024-05-27 346 char c[3];
ed7ae4f43e228c Christian Marangi 2024-05-27 347 int nrchars;
ed7ae4f43e228c Christian Marangi 2024-05-27 348 int ret;
ed7ae4f43e228c Christian Marangi 2024-05-27 349 int offset = 0;
ed7ae4f43e228c Christian Marangi 2024-05-27 350 int page, i = 0;
ed7ae4f43e228c Christian Marangi 2024-05-27 351
ed7ae4f43e228c Christian Marangi 2024-05-27 352 while ((offset < size - 1) && (i < LP5569_PROGRAM_LENGTH)) {
ed7ae4f43e228c Christian Marangi 2024-05-27 353 /* separate sscanfs because length is working only for %s */
ed7ae4f43e228c Christian Marangi 2024-05-27 354 ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
ed7ae4f43e228c Christian Marangi 2024-05-27 355 if (ret != 1)
ed7ae4f43e228c Christian Marangi 2024-05-27 356 goto err;
ed7ae4f43e228c Christian Marangi 2024-05-27 357
ed7ae4f43e228c Christian Marangi 2024-05-27 358 ret = sscanf(c, "%2x", &cmd);
ed7ae4f43e228c Christian Marangi 2024-05-27 359 if (ret != 1)
ed7ae4f43e228c Christian Marangi 2024-05-27 360 goto err;
ed7ae4f43e228c Christian Marangi 2024-05-27 361
ed7ae4f43e228c Christian Marangi 2024-05-27 362 pattern[i] = (u8)cmd;
ed7ae4f43e228c Christian Marangi 2024-05-27 363 offset += nrchars;
ed7ae4f43e228c Christian Marangi 2024-05-27 364 i++;
ed7ae4f43e228c Christian Marangi 2024-05-27 365 }
ed7ae4f43e228c Christian Marangi 2024-05-27 366
ed7ae4f43e228c Christian Marangi 2024-05-27 367 /* Each instruction is 16bit long. Check that length is even */
ed7ae4f43e228c Christian Marangi 2024-05-27 368 if (i % 2)
ed7ae4f43e228c Christian Marangi 2024-05-27 369 goto err;
ed7ae4f43e228c Christian Marangi 2024-05-27 370
ed7ae4f43e228c Christian Marangi 2024-05-27 371 for (page = 0; page < LP5569_PROGRAM_LENGTH / LP5569_BYTES_PER_PAGE; page++) {
ed7ae4f43e228c Christian Marangi 2024-05-27 372 /* Write to the next page each 32 bytes */
ed7ae4f43e228c Christian Marangi 2024-05-27 373 lp55xx_write(chip, LP5569_REG_PROG_PAGE_SEL,
ed7ae4f43e228c Christian Marangi 2024-05-27 374 LP5569_PAGE_ENG(idx) + page);
ed7ae4f43e228c Christian Marangi 2024-05-27 375
ed7ae4f43e228c Christian Marangi 2024-05-27 376 for (i = 0; i < LP5569_PROGRAM_LENGTH; i++) {
ed7ae4f43e228c Christian Marangi 2024-05-27 377 ret = lp55xx_write(chip, LP5569_REG_PROG_MEM + i,
ed7ae4f43e228c Christian Marangi 2024-05-27 @378 pattern[i + (page * LP5569_BYTES_PER_PAGE)]);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
i can co up to LP5569_PROGRAM_LENGTH and "page * LP5569_BYTES_PER_PAGE"
can also go up to LP5569_PROGRAM_LENGTH. So we're 2x beyond the end of
the array.
ed7ae4f43e228c Christian Marangi 2024-05-27 379 if (ret)
ed7ae4f43e228c Christian Marangi 2024-05-27 380 return -EINVAL;
ed7ae4f43e228c Christian Marangi 2024-05-27 381 }
ed7ae4f43e228c Christian Marangi 2024-05-27 382 }
ed7ae4f43e228c Christian Marangi 2024-05-27 383
ed7ae4f43e228c Christian Marangi 2024-05-27 384
ed7ae4f43e228c Christian Marangi 2024-05-27 385 return size;
ed7ae4f43e228c Christian Marangi 2024-05-27 386
ed7ae4f43e228c Christian Marangi 2024-05-27 387 err:
ed7ae4f43e228c Christian Marangi 2024-05-27 388 dev_err(&chip->cl->dev, "wrong pattern format\n");
ed7ae4f43e228c Christian Marangi 2024-05-27 389 return -EINVAL;
ed7ae4f43e228c Christian Marangi 2024-05-27 390 }
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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