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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id ip7sm2663266pjb.39.2021.06.16.09.40.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Jun 2021 09:40:46 -0700 (PDT) From: Kees Cook To: linux-kernel@vger.kernel.org Cc: Kees Cook , Christoph Hellwig , Al Viro , gmpy.liaowx@gmail.com, Anton Vorontsov , Colin Cross , Tony Luck , Jonathan Corbet , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , linux-doc@vger.kernel.org, linux-mtd@lists.infradead.org, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH v3 1/5] pstore/blk: Improve failure reporting Date: Wed, 16 Jun 2021 09:40:39 -0700 Message-Id: <20210616164043.1221861-2-keescook@chromium.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210616164043.1221861-1-keescook@chromium.org> References: <20210616164043.1221861-1-keescook@chromium.org> MIME-Version: 1.0 X-Patch-Hashes: v=1; h=sha256; g=95c1880167375f358445fa6b36d9d46efbebcc09; i=x+eth6WIY3ZV3RikljpGvsEDOkHC4+JR/D6VkOL4MwM=; m=KWKLltarrgCHVaChKkiXTTMXR+nWhEDb2yQ+7Fx0dy0=; p=hVqcquLAjJY5MNtchTMAytKSIfiafQn164H7tkcB2Bg= X-Patch-Sig: m=pgp; i=keescook@chromium.org; s=0x0x8972F4DFDC6DC026; b=iQIzBAABCgAdFiEEpcP2jyKd1g9yPm4TiXL039xtwCYFAmDKKYkACgkQiXL039xtwCZgHhAAode R8F21Ztaztm9OD+m51tZDz9H7Jmr3b179RR3mjQtLY5uCy9QlEpGuYAsz/ABz9YrgP0QBOkMztOPC oQPxj2VnCVVuMJRSzFTue9HH70ItKKMz/VIHIFeV7GPStnetLsLWB+ndgzT9ustwokFew+5O35X/l pOmZy7Ol4tvlE44IfAyL6U9z8p9P9r+3a9UyoxW9Hm+KrSC9fxCG0wayJe8PqBkEdSvJ7VolFsRPr bT2bKgOb1F1vZFcHVIK00XvErTh0b6lTlWZWU9m91uH0S47Z7T+rnsJyiRLAldZiTQW2TMWo4zkIs 0QXC77HT2aXShl9P8FZkqmxDS/bYJqYFmt8ags6dV7EPjaOdAt42WMXdYEYuwsZBUVjFVwqpxZPm6 v+z7VzEJQYXs4rrkOOdcUVk4p+BuoyTrmR6/YbOjHkmvW8ufWZxNlndmPcAXW2+CMqV+U8p3LiHnF Yt8bHShaW175vGPMGqhldiLQpQQvJUMtlfrf35EBWHfvA4lDbhJPkvYW/nytaYgyjrnSUmdNqcLTA sb5e0RWD0gXDZqBhYJX7byjf49AFfMoBn3f/Jke02up/jENft69J+Zz4+g+yXD8yERwRPUVy/A8fG Mty73UjHC9R3wIIIG2JsoPGhsP+8rLEgD7c7d6KYl/Pu9NcT44LdTcznpdHhVMi0= Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org There was no feedback on bad registration attempts. Add details on the failure cause. Signed-off-by: Kees Cook Reviewed-by: Christoph Hellwig --- fs/pstore/blk.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/fs/pstore/blk.c b/fs/pstore/blk.c index 4bb8a344957a..eca83820fb5d 100644 --- a/fs/pstore/blk.c +++ b/fs/pstore/blk.c @@ -114,8 +114,22 @@ static int __register_pstore_device(struct pstore_device_info *dev) lockdep_assert_held(&pstore_blk_lock); - if (!dev || !dev->total_size || !dev->read || !dev->write) + if (!dev) { + pr_err("NULL device info\n"); return -EINVAL; + } + if (!dev->total_size) { + pr_err("zero sized device\n"); + return -EINVAL; + } + if (!dev->read) { + pr_err("no read handler for device\n"); + return -EINVAL; + } + if (!dev->write) { + pr_err("no write handler for device\n"); + return -EINVAL; + } /* someone already registered before */ if (pstore_zone_info)