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bh=a5h2HmNadxFaYgfpo+s2gFMHb1YNvcR9sTX4oIM7oFQ=; b=PpsWYji3W3twC2WbxrEyKWIt2KzbdmUuTEO3IBXT6yB/HvOTtbp6btQyLcgsKeETCSDt4I Ankx32Mf5HpUH5apakOc4teeDiJVgmpFtxUCQZEM3jGNAljqsYdQ5ovR8BFngwKZ4p/TgT Jiz1mDlw4IIDa3yuwmSP5+uwLc6WirU= X-MC-Unique: Tg91MYIDM_iRZeTw3PnVXg-1 From: Gerd Hoffmann To: qemu-devel@nongnu.org Subject: [PULL 07/13] sm501: Do not allow guest to set invalid format Date: Wed, 1 Jul 2020 17:04:19 +0200 Message-Id: <20200701150425.13739-8-kraxel@redhat.com> In-Reply-To: <20200701150425.13739-1-kraxel@redhat.com> References: <20200701150425.13739-1-kraxel@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=kraxel@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com 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; 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charset="utf-8" From: BALATON Zoltan Prevent guest setting invalid format value that might trip checks in sm501_2d_operation(). Signed-off-by: BALATON Zoltan Reviewed-by: Peter Maydell Message-id: 26d4fa9b8ce81e2723e98d592ccba7550042752c.1592686588.git.balaton= @eik.bme.hu Signed-off-by: Gerd Hoffmann --- hw/display/sm501.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/hw/display/sm501.c b/hw/display/sm501.c index 6349f31e6491..7e4c042d5229 100644 --- a/hw/display/sm501.c +++ b/hw/display/sm501.c @@ -1503,6 +1503,9 @@ static void sm501_2d_engine_write(void *opaque, hwadd= r addr, s->twoD_background =3D value; break; case SM501_2D_STRETCH: + if (((value >> 20) & 3) =3D=3D 3) { + value &=3D ~BIT(20); + } s->twoD_stretch =3D value; break; case SM501_2D_COLOR_COMPARE: --=20 2.18.4