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[2001:8b0:1d0::2]) by smtp.gmail.com with ESMTPSA id l18-20020a05600c1d1200b003a04d19dab3sm11772745wms.3.2022.07.21.04.52.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Jul 2022 04:52:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=PxJwjVAzbS0o6r9Gh4EM7dFWlXeZcq5sXf7+Lmnjej4=; b=JAlrrGIhijtxWfz2ZGXU1tU9NQqC6Mus2tb/9erwjDra90zriFK4jWhHTRa8f0RR18 6xFcD/uNm1xjwRDVKym0toUF21QunzYNcR8/EBQ/iYLDNVFvaT6Fs5I0bIfjzmFT1EHB HFe8x5I9CS4PlvF+mT+U3E8AMN5dcoD45m+/ld1MEbJN9ZQTjXbMo3J4hEqd7O5jCxjM Mo+mRHohEqPJs4WfTEOa1txasr7u02DsIj0k7KmAMJa+odhgT29962XTLeZ54IcgZmVo UHVbqZ3ZM5H9axyMtfJ6NiXQZtaz1KfWAhaArTHY0p5aKVohHqPYtYx5CKfJ8aBIcky2 Xwfg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=PxJwjVAzbS0o6r9Gh4EM7dFWlXeZcq5sXf7+Lmnjej4=; b=S6TuTMJsbaOo92khFXn29vqCEJRgxKnanHQdYs8APOnGuU+5xxRY/slOWxD3QDzYsg PYiCYGfqtta3RB2LMFHOXxOtjNHMJtxIfANiwe43b4aln9IqxXZW7rqrz4otgUX0B9P0 TVyQST47vmoXKYIGnOGzh25hPp0uMlCSWToKApgUso/Snm2Gy5yiENn5PbHI+vpm67U7 iO9dwOK4lPfp7ogYEKFb2J8joQTXacfxh+i72M726EQQmoFQY2mcqo5pf9bG+lG9+te2 j+ID2VRGq0dAq76vmae87K3YdemY1ofzLW4RniKwYpMCgi5g8leTo63CgS5X+YyZSfHW Sy3w== X-Gm-Message-State: AJIora9cLqk7yeFh7A88TsGgSxgABkhOp9DLGvlE448fOq/HdkNDPzwx XRqjHB4XG966y4XlgUuJuHTjnMtoZg/5Aw== X-Google-Smtp-Source: AGRyM1vp4lPIC5QgiM1iUJdKCgqsXHDwNOus2Xs0yCq+ILV+wK9dR6Cv7tZQzmDySP+v4lOmNSzkGQ== X-Received: by 2002:a5d:64c2:0:b0:21e:2e1b:d031 with SMTP id f2-20020a5d64c2000000b0021e2e1bd031mr10664854wri.8.1658404332957; Thu, 21 Jul 2022 04:52:12 -0700 (PDT) From: Peter Maydell To: qemu-devel@nongnu.org Cc: qemu-block@nongnu.org, "Dr. David Alan Gilbert" , Juan Quintela , Fam Zheng , Stefan Hajnoczi Subject: [PATCH 2/2] migration: Define BLK_MIG_BLOCK_SIZE as unsigned long long Date: Thu, 21 Jul 2022 12:52:07 +0100 Message-Id: <20220721115207.729615-3-peter.maydell@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220721115207.729615-1-peter.maydell@linaro.org> References: <20220721115207.729615-1-peter.maydell@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::434; envelope-from=peter.maydell@linaro.org; helo=mail-wr1-x434.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1658404452981100003 Content-Type: text/plain; charset="utf-8" When we use BLK_MIG_BLOCK_SIZE in expressions like block_mig_state.submitted * BLK_MIG_BLOCK_SIZE, this multiplication is done as 32 bits, because both operands are 32 bits. Coverity complains about possible overflows because we then accumulate that into a 64 bit variable. Define BLK_MIG_BLOCK_SIZE as unsigned long long using the ULL suffix. The only two current uses of it with this problem are both in block_save_pending(), so we could just cast to uint64_t there, but using the ULL suffix is simpler and ensures that we don't accidentally introduce new variants of the same issue in future. Resolves: Coverity CID 1487136, 1487175 Signed-off-by: Peter Maydell Reviewed-by: Dr. David Alan Gilbert Reviewed-by: Juan Quintela --- I haven't tried to analyse the code to see if the multiplications could ever actually end up overflowing, but I would assume probably not. migration/block.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/migration/block.c b/migration/block.c index 9e5aae58982..3577c815a94 100644 --- a/migration/block.c +++ b/migration/block.c @@ -28,7 +28,7 @@ #include "sysemu/block-backend.h" #include "trace.h" =20 -#define BLK_MIG_BLOCK_SIZE (1 << 20) +#define BLK_MIG_BLOCK_SIZE (1ULL << 20) #define BDRV_SECTORS_PER_DIRTY_CHUNK (BLK_MIG_BLOCK_SIZE >> BDRV_SECTOR_BI= TS) =20 #define BLK_MIG_FLAG_DEVICE_BLOCK 0x01 --=20 2.25.1