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[79.22.100.164]) by smtp.gmail.com with ESMTPSA id c19sm7892625ejs.116.2021.08.25.03.13.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Aug 2021 03:13:39 -0700 (PDT) From: "Fabio M. De Francesco" To: Larry.Finger@lwfinger.net, phil@philpotter.co.uk, gregkh@linuxfoundation.org, straube.linux@gmail.com, Pavel Skripkin Cc: linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org, Pavel Skripkin Subject: Re: [PATCH v3 0/6] staging: r8188eu: avoid uninit value bugs Date: Wed, 25 Aug 2021 12:13:38 +0200 Message-ID: <1640255.mRBsJQyRh4@localhost.localdomain> In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tuesday, August 24, 2021 9:25:45 AM CEST Pavel Skripkin wrote: > Hi, Greg, Larry and Phillip! > > I noticed, that new staging driver was added like 3 weeks ago and I decided > to look at the code, because drivers in staging directory are always buggy. > > The first thing I noticed is *no one* was checking read operations result, but > it can fail and driver may start writing random stack values into registers. It > can cause driver misbehavior or device misbehavior. > > To avoid this type of bugs, I've changed rtw_read* API. Now all rtw_read > funtions return an error, when something went wrong with usb transfer. > > It helps callers to break/return earlier and don't write random values to > registers or to rely on random values. > > > v2 -> v3: > 1. Fixed OOPS in usb_read32(), caused by writing to u32 ** > 2. Fixed style in rtw_read32, rtw_read16 and rtw_read8 (Suggested by Dan) > 3. Added error hanling when usb_control_msg() returns ret != len > NOTE: Dan suggested to add this to usbctrl_vendorreq(), but there is > pending series, which will get rid of usb_control_msg(), so (res != len) > check can be removed, when Fabio's series will go in > 4. Removed RFC tag > > v1 -> v2: > 1. Make rtw_read*() return an error instead of initializing pointer to error > 2. Split one huge patch to smaller ones for each rtw_read{8,16,32} function > changes > 3. Add new macro for printing register values (It helps to not copy-paste error > handling) > 4. Removed {read,write}_macreg (Suggested by Phillip) > 5. Rebased on top of staging-next > 6. Cleaned checkpatch errors and warnings > > > Phillip has tested fixed v2 version, AFAIU I had already acked your series when it was an RFC but I guess the tag gets lost now that you have submitted the "real" patches. As said, I like the purpose and the overall design. Furthermore, I have compiled and linked the whole series (make C=2 -j8 drivers/staging/r8188eu W=1) and I can confirm it does not introduce any errors and/or warnings. Anyway I couldn't test the module, so (for all six patches)... Acked-by: Fabio M. De Francesco Thanks, Fabio > Pavel Skripkin (6): > staging: r8188eu: remove {read,write}_macreg > staging: r8188eu: add helper macro for printing registers > staging: r8188eu: add error handling of rtw_read8 > staging: r8188eu: add error handling of rtw_read16 > staging: r8188eu: add error handling of rtw_read32 > staging: r8188eu: make ReadEFuse return an int > > drivers/staging/r8188eu/core/rtw_debug.c | 79 +++- > drivers/staging/r8188eu/core/rtw_efuse.c | 125 +++-- > drivers/staging/r8188eu/core/rtw_io.c | 27 +- > drivers/staging/r8188eu/core/rtw_mp.c | 70 ++- > drivers/staging/r8188eu/core/rtw_mp_ioctl.c | 13 +- > drivers/staging/r8188eu/core/rtw_pwrctrl.c | 5 +- > drivers/staging/r8188eu/core/rtw_sreset.c | 9 +- > .../r8188eu/hal/Hal8188ERateAdaptive.c | 8 +- > drivers/staging/r8188eu/hal/HalPhyRf_8188e.c | 21 +- > drivers/staging/r8188eu/hal/HalPwrSeqCmd.c | 9 +- > drivers/staging/r8188eu/hal/hal_com.c | 23 +- > drivers/staging/r8188eu/hal/hal_intf.c | 6 +- > drivers/staging/r8188eu/hal/odm_interface.c | 12 +- > drivers/staging/r8188eu/hal/rtl8188e_cmd.c | 33 +- > drivers/staging/r8188eu/hal/rtl8188e_dm.c | 6 +- > .../staging/r8188eu/hal/rtl8188e_hal_init.c | 285 +++++++++--- > drivers/staging/r8188eu/hal/rtl8188e_phycfg.c | 27 +- > drivers/staging/r8188eu/hal/rtl8188e_sreset.c | 22 +- > drivers/staging/r8188eu/hal/rtl8188eu_led.c | 18 +- > drivers/staging/r8188eu/hal/usb_halinit.c | 439 +++++++++++++++--- > drivers/staging/r8188eu/hal/usb_ops_linux.c | 62 ++- > drivers/staging/r8188eu/include/hal_intf.h | 6 +- > .../staging/r8188eu/include/odm_interface.h | 6 +- > .../staging/r8188eu/include/rtl8188e_hal.h | 2 +- > drivers/staging/r8188eu/include/rtw_debug.h | 13 + > drivers/staging/r8188eu/include/rtw_efuse.h | 4 +- > drivers/staging/r8188eu/include/rtw_io.h | 18 +- > drivers/staging/r8188eu/include/rtw_mp.h | 2 - > drivers/staging/r8188eu/os_dep/ioctl_linux.c | 179 +++++-- > drivers/staging/r8188eu/os_dep/usb_intf.c | 3 +- > 30 files changed, 1143 insertions(+), 389 deletions(-) > > -- > 2.32.0 > >