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[81.2.115.148]) by smtp.gmail.com with ESMTPSA id c18sm22396540wrt.10.2020.11.02.09.10.40 for <qemu-devel@nongnu.org> (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Nov 2020 09:10:40 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=ed/BTbi7euqfL1hXrKVEmFWNJJJT/JBXDy33Yta9R7U=; b=TvTnE7PwnkqUuwn6H7RD13+NfZIpEdUkznHeUQeFVQXh39/CqsOxp2fhwC1SbNGTt1 azfUfYe49rHZeaYdg2cA9XA2MyeaRN2Hfjg0bAYky7o1zlwT7kzHtf+uMEYssZQAD/jB D9hKTmHO8sv8ZSCnBqaKsum4fmhxUrnP3X+/ul0mBa6OVykRnRcQ7oT1q5GJ3lT8vgUZ 1rF0mCfsWpVwVJ5f/bDrYsV90h48ru4alLEOqnQ1wOIa4lSBiOq5yPDMWLU6vs8NmcSq 8hH7xb8zBjV/gQfuV+hIHLkidyTFEmTlH1w8jWijCXw1TecuraLh9UeqzCb53fTm592D O0Ww== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ed/BTbi7euqfL1hXrKVEmFWNJJJT/JBXDy33Yta9R7U=; b=DcrhwdIBwiLreKbf6Pg0Uo9piqDoDVTmo6GWkZ3cXPFug25JE2aqi89DnCbMTWJt1W SzDAIZlCCvSy0Ie4c9zN/PDstF0KOcCVIgke4NmCA9MUIX+Fd1fSL+3z0IMPgNQwE/bJ LxPAMapd0gunk2fSnwsNUbLpxj3Of6PcpECfIQMsv8rv9ayTl89B2T3ZjZUQlPAEjLM9 G0REoAQM3jqwNfpFoV8TvrhOHW7KEclORyT+3/dgvHRtTWZTldo8fu1gNlsRT4ZtI1Dc bsjmUlqz44u850AwioZEaUFO9WtXQa5stMsljLEmYCyIFO6oVQYL4vR11sInkDff6t7n S3Bw== X-Gm-Message-State: AOAM531wuBkxSr7OLmJ7Wmp+tsAlN12DBIQ6+tKHnGkVA8jb9sIdvzLM fmOqoEC+0L+m4bscGwmOIx1HHUmSY/ekKg== X-Google-Smtp-Source: ABdhPJxNAaM7Rer+oJ5v+BdkOK1sKxhQLHn/lQa9rsJmRbTvMzSg9xxRtCjS+PI2DzGhweo6IOeCkg== X-Received: by 2002:a1c:4d14:: with SMTP id o20mr18197607wmh.72.1604337041221; Mon, 02 Nov 2020 09:10:41 -0800 (PST) From: Peter Maydell <peter.maydell@linaro.org> To: qemu-devel@nongnu.org Subject: [PULL 20/26] hw/display/exynos4210_fimd: Fix potential NULL pointer dereference Date: Mon, 2 Nov 2020 17:09:59 +0000 Message-Id: <20201102171005.30690-21-peter.maydell@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201102171005.30690-1-peter.maydell@linaro.org> References: <20201102171005.30690-1-peter.maydell@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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::342; envelope-from=peter.maydell@linaro.org; helo=mail-wm1-x342.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. 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 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: <qemu-devel.nongnu.org> List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>, <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe> List-Archive: <https://lists.nongnu.org/archive/html/qemu-devel> List-Post: <mailto:qemu-devel@nongnu.org> List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help> List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>, <mailto:qemu-devel-request@nongnu.org?subject=subscribe> Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" <qemu-devel-bounces+importer=patchew.org@nongnu.org> X-ZohoMail-DKIM: pass (identity @linaro.org) From: AlexChen <alex.chen@huawei.com> In exynos4210_fimd_update(), the pointer s is dereferinced before being check if it is valid, which may lead to NULL pointer dereference. So move the assignment to global_width after checking that the s is valid. Reported-by: Euler Robot <euler.robot@huawei.com> Signed-off-by: Alex Chen <alex.chen@huawei.com> Reviewed-by: Philippe Mathieu-Daud=C3=A9 <philmd@redhat.com> Message-id: 5F9F8D88.9030102@huawei.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org> --- hw/display/exynos4210_fimd.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/hw/display/exynos4210_fimd.c b/hw/display/exynos4210_fimd.c index 4c16e1f5a00..34a960a9765 100644 --- a/hw/display/exynos4210_fimd.c +++ b/hw/display/exynos4210_fimd.c @@ -1275,12 +1275,14 @@ static void exynos4210_fimd_update(void *opaque) bool blend =3D false; uint8_t *host_fb_addr; bool is_dirty =3D false; - const int global_width =3D (s->vidtcon[2] & FIMD_VIDTCON2_SIZE_MASK) += 1; + int global_width; =20 if (!s || !s->console || !s->enabled || surface_bits_per_pixel(qemu_console_surface(s->console)) =3D=3D 0)= { return; } + + global_width =3D (s->vidtcon[2] & FIMD_VIDTCON2_SIZE_MASK) + 1; exynos4210_update_resolution(s); surface =3D qemu_console_surface(s->console); =20 --=20 2.20.1