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Thu, 8 Mar 2018 00:59:17 -0500 Received: from mail-by2nam03on0103.outbound.protection.outlook.com ([104.47.42.103]:37347 "EHLO NAM03-BY2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751173AbeCHFDU (ORCPT ); Thu, 8 Mar 2018 00:03:20 -0500 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Dan Carpenter , Steve French , Sasha Levin Subject: [PATCH AUTOSEL for 4.9 142/190] cifs: small underflow in cnvrtDosUnixTm() Thread-Topic: [PATCH AUTOSEL for 4.9 142/190] cifs: small underflow in cnvrtDosUnixTm() Thread-Index: AQHTtppMWrPHLcfrpkKqsRqlA2GQ2A== Date: Thu, 8 Mar 2018 04:59:54 +0000 Message-ID: <20180308045810.8041-142-alexander.levin@microsoft.com> References: <20180308045810.8041-1-alexander.levin@microsoft.com> In-Reply-To: <20180308045810.8041-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB0902;7:nBb3IlA9VmUEM1jYjLWXODU5LSFh4dgrLyB+dQd94fpeO+QBZOdSQj67ABcjjxRo171jboiaiXu7NMBU6PTQpFhr1JUYx8os6ylJhAh6lOl+qA2zxF83dpH3/BxBdQrlsVpdWhfzb0LxUf4JNuqpiflgulKP8NTf6nLrPt56aTa9yV4Vox1pDWvBr0rN551xPbBpzHNLzWjhtiAHGGX/XU49hfeIvc4+1fyNInpZwMjZQZ7hck5AkUSZhZX25ODe;20:pRetR/0MdU69xWswDbPXkrmWNv6i+aVQ/xBdubon25IfrBTxfVIYfL4ajZ27bzvjh7UfBOf9S83ZDXa7Ahp9pA4ClPu5WCxfcA1enAM6zfi311+Sy+eJ5iJy358TJl8bl2G3AkVLqaPpYsFi0dqoqU+odskko+Fz52KKjbnrDHE= x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: fe9aed31-35e7-4b97-6e0f-08d584b1e900 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB0902; 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There is no zero-th month. If someone passes a zero month then it means we read from one space before the start of the total_days_of_prev_months[] array. We may as well also be strict about days as well. Fixes: 1bd5bbcb6531 ("[CIFS] Legacy time handling for Win9x and OS/2 part 1= ") Signed-off-by: Dan Carpenter Signed-off-by: Steve French Signed-off-by: Sasha Levin --- fs/cifs/netmisc.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/fs/cifs/netmisc.c b/fs/cifs/netmisc.c index abae6dd2c6b9..cc88f4f0325e 100644 --- a/fs/cifs/netmisc.c +++ b/fs/cifs/netmisc.c @@ -980,10 +980,10 @@ struct timespec cnvrtDosUnixTm(__le16 le_date, __le16= le_time, int offset) cifs_dbg(VFS, "illegal hours %d\n", st->Hours); days =3D sd->Day; month =3D sd->Month; - if ((days > 31) || (month > 12)) { + if (days < 1 || days > 31 || month < 1 || month > 12) { cifs_dbg(VFS, "illegal date, month %d day: %d\n", month, days); - if (month > 12) - month =3D 12; + days =3D clamp(days, 1, 31); + month =3D clamp(month, 1, 12); } month -=3D 1; days +=3D total_days_of_prev_months[month]; --=20 2.14.1