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[209.85.220.65]) by mx.google.com with SMTPS id b1sor6004934eja.51.2019.05.02.09.31.40 for (Google Transport Security); Thu, 02 May 2019 09:31:40 -0700 (PDT) Received-SPF: pass (google.com: domain of natechancellor@gmail.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=qw6j5mpw; spf=pass (google.com: domain of natechancellor@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=natechancellor@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=7Oy1RG3BUKEsx4VUlFgLOKgTT7HGDm6BmTdCPYEVHzI=; b=qw6j5mpwSwKYxN/oL4IAsK/zH1v/EkIn+dDLKuZam7yyhsQTM8KB9cL677/5Oz7MVy IexCjBqxB23TohGwbBNWIteLggib7PQ3HCSGF844ugqO8ODk5dxWwnXEZg9sKL1DIzyR J/+ASLTaOgJswbMKQq8KaHH3d5PttebWx1MBEpVqQ93t2Os4ETMG7fcecg0n18fINZuk fWyvoeQsc12VsByCTBs3lt6WG9FvJ9kaNvf+e8CIKjw4G35upmxBIcv//uweMZ6jFNL8 D79gY0owa3HXwk0qwp26NVPUdg9mRp/hYXIhEdDJ1ZNlad7IQv9ewy6AszUJc2gWsEip EYWg== X-Google-Smtp-Source: APXvYqz4jS4aZzqlMk96rIVkIK1ahQvD2cBXh7geHSHkh6Ve3klRmskSiNbCIGL6V2kmJmVabxVeIg== X-Received: by 2002:a17:906:5fd7:: with SMTP id k23mr2318906ejv.201.1556814699691; Thu, 02 May 2019 09:31:39 -0700 (PDT) Received: from localhost.localdomain ([2a01:4f9:2b:2b84::2]) by smtp.gmail.com with ESMTPSA id oq25sm7460093ejb.46.2019.05.02.09.31.38 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 02 May 2019 09:31:38 -0700 (PDT) From: Nathan Chancellor To: Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov Cc: kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Nick Desaulniers , clang-built-linux@googlegroups.com, Nathan Chancellor Subject: [PATCH v2] kasan: Initialize tag to 0xff in __kasan_kmalloc Date: Thu, 2 May 2019 09:30:58 -0700 Message-Id: <20190502163057.6603-1-natechancellor@gmail.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190502153538.2326-1-natechancellor@gmail.com> References: <20190502153538.2326-1-natechancellor@gmail.com> MIME-Version: 1.0 X-Patchwork-Bot: notify Content-Transfer-Encoding: 8bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: When building with -Wuninitialized and CONFIG_KASAN_SW_TAGS unset, Clang warns: mm/kasan/common.c:484:40: warning: variable 'tag' is uninitialized when used here [-Wuninitialized] kasan_unpoison_shadow(set_tag(object, tag), size); ^~~ set_tag ignores tag in this configuration but clang doesn't realize it at this point in its pipeline, as it points to arch_kasan_set_tag as being the point where it is used, which will later be expanded to (void *)(object) without a use of tag. Initialize tag to 0xff, as it removes this warning and doesn't change the meaning of the code. Link: https://github.com/ClangBuiltLinux/linux/issues/465 Signed-off-by: Nathan Chancellor --- v1 -> v2: * Initialize tag to 0xff at Andrey's request mm/kasan/common.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/kasan/common.c b/mm/kasan/common.c index 36afcf64e016..242fdc01aaa9 100644 --- a/mm/kasan/common.c +++ b/mm/kasan/common.c @@ -464,7 +464,7 @@ static void *__kasan_kmalloc(struct kmem_cache *cache, const void *object, { unsigned long redzone_start; unsigned long redzone_end; - u8 tag; + u8 tag = 0xff; if (gfpflags_allow_blocking(flags)) quarantine_reduce(); -- 2.21.0