Hi Ryder, url: https://github.com/0day-ci/linux/commits/Ryder-Lee/mt76-mt7915-add-missing-capabilities-for-DBDC/20210225-230323 base: https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/wireless-drivers-next.git master config: x86_64-randconfig-m001-20210309 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 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/net/wireless/mediatek/mt76/mt7915/init.c:353 mt7915_set_stream_vht_txbf_caps() error: potentially dereferencing uninitialized 'cap'. vim +/cap +353 drivers/net/wireless/mediatek/mt76/mt7915/init.c 00b2e16e006390 Ryder Lee 2020-05-12 344 void mt7915_set_stream_vht_txbf_caps(struct mt7915_phy *phy) 00b2e16e006390 Ryder Lee 2020-05-12 345 { 50a6fe79623e22 Ryder Lee 2021-02-25 346 int nss; 50a6fe79623e22 Ryder Lee 2021-02-25 347 u32 *cap; 50a6fe79623e22 Ryder Lee 2021-02-25 348 50a6fe79623e22 Ryder Lee 2021-02-25 349 if (!phy->mt76->cap.has_5ghz) 50a6fe79623e22 Ryder Lee 2021-02-25 350 return; 50a6fe79623e22 Ryder Lee 2021-02-25 351 50a6fe79623e22 Ryder Lee 2021-02-25 352 nss = hweight8(phy->mt76->chainmask); 50a6fe79623e22 Ryder Lee 2021-02-25 @353 *cap = &phy->mt76->sband_5g.sband.vht_cap.cap; ^^^^ "cap" isn't initialized. 00b2e16e006390 Ryder Lee 2020-05-12 354 00b2e16e006390 Ryder Lee 2020-05-12 355 *cap |= IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE | 00b2e16e006390 Ryder Lee 2020-05-12 356 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE | 00b2e16e006390 Ryder Lee 2020-05-12 357 (3 << IEEE80211_VHT_CAP_BEAMFORMEE_STS_SHIFT); 00b2e16e006390 Ryder Lee 2020-05-12 358 00b2e16e006390 Ryder Lee 2020-05-12 359 *cap &= ~(IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_MASK | 00b2e16e006390 Ryder Lee 2020-05-12 360 IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE | 00b2e16e006390 Ryder Lee 2020-05-12 361 IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE); 00b2e16e006390 Ryder Lee 2020-05-12 362 00b2e16e006390 Ryder Lee 2020-05-12 363 if (nss < 2) 00b2e16e006390 Ryder Lee 2020-05-12 364 return; 00b2e16e006390 Ryder Lee 2020-05-12 365 00b2e16e006390 Ryder Lee 2020-05-12 366 *cap |= IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE | 00b2e16e006390 Ryder Lee 2020-05-12 367 IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE | 00b2e16e006390 Ryder Lee 2020-05-12 368 FIELD_PREP(IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_MASK, 00b2e16e006390 Ryder Lee 2020-05-12 369 nss - 1); 00b2e16e006390 Ryder Lee 2020-05-12 370 } --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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