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b=DnpEM8qayArSNIuAlpQa3RQcoaigbNJjFlAib8/8Pd7NJcS1hOk8EDbcpNvjjBWvl3LhoCtowrLBWaUJJ28KNPiJwDF+Mg322EuFUHtTmXsJ9GSOa3hKRlfR0vFPmoxXxntkwJlXvdNsknCFrAGP1kR6AbpNfBdFED4qgpN+oivXKWMOj8s7/K7C7I48zWNATq2o15xzcZ2oNLTVT6Rtv6eyp5gIkR5MKjCu4RPjk8AyOFbI3U9CT576XCfGauLjR/4y2M4AxzwryfT4y4pAENdJtKbRvPtmA2G0DQw2eNYDTRNP/jIb9zhjIj89K1eecLfzXT7Am2BaWpMHszMSjg== From: Mykyta Poturai To: "xen-devel@lists.xenproject.org" CC: Mykyta Poturai , =?iso-8859-1?Q?Roger_Pau_Monn=E9?= Subject: [XEN PATCH] xen/vpci: Fix UB in mask_write Thread-Topic: [XEN PATCH] xen/vpci: Fix UB in mask_write Thread-Index: AQHbMCKf4QVge+H9k02dX4ZlwzpGqA== Date: Wed, 6 Nov 2024 08:05:19 +0000 Message-ID: <559dfac91b8f097bc59c4de194fd2ae2b5b4144c.1730880005.git.mykyta_poturai@epam.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=epam.com; x-ms-publictraffictype: Email x-ms-traffictypediagnostic: PAVPR03MB10102:EE_|DBAPR03MB6392:EE_ x-ms-office365-filtering-correlation-id: 4bd54490-b9b6-41b5-03fc-08dcfe39c1d7 x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0;ARA:13230040|366016|376014|1800799024|38070700018; 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charset="utf-8" During the construction of dmask value, it gets shifted by (32 - msi->vectors) bits. If msi->vectors is 0, the result of the shift becomes undefined due to shifting by a size of the type. While this works fine on x86, on ARM the resulting mask becomes 0xFFFFFFFF, which is incorrect. Fix this by adding an explicit check for msi->vectors =3D=3D 0. Signed-off-by: Mykyta Poturai --- xen/drivers/vpci/msi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/xen/drivers/vpci/msi.c b/xen/drivers/vpci/msi.c index 7bda47e7fc..787296fd42 100644 --- a/xen/drivers/vpci/msi.c +++ b/xen/drivers/vpci/msi.c @@ -172,7 +172,7 @@ static void cf_check mask_write( struct vpci_msi *msi =3D data; uint32_t dmask =3D msi->mask ^ val; =20 - if ( !dmask ) + if ( !dmask || msi->vectors =3D=3D 0 ) return; =20 if ( msi->enabled ) --=20 2.34.1