From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Mon, 27 May 2024 09:29:57 +0200 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1sBUnt-000d1j-1x for lore@lore.pengutronix.de; Mon, 27 May 2024 09:29:57 +0200 Received: from bombadil.infradead.org ([2607:7c80:54:3::133]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1sBUnt-0008JC-0M for lore@pengutronix.de; Mon, 27 May 2024 09:29:57 +0200 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-Id:Date :Subject:To:From:Reply-To:Content-Type:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=ZZ+ISc0eWnoThPw9cMITWk5MUJfyO1DBUgI76R9LaOw=; b=SIk7tgufL35CZU OYvIjzCh+jjl8n6CiSa93RsJynf7uHMvs9QyFADbAB5vPDPmDg/ReQOj9GBjvo0A8d0AGNqcQREnP Xko75hLHNiluGvQyX48Ks9IU5OI7U5iRDtenqHyBBlWoErOXX0Vngk4a4KCKc1TibXsf72TzOg7DN oKI6GMw2a8SN4+Cbj5ZxJa8xwerOG0F1vl3OJ5TuEz10TVbXRNLESkDg91QUHVwksnMGKBH9Wev/t PMMm/Tc1IGQKvWV4M7mtRELpr1OWipfz5c0ckbqTpsUmylanjRYUTOxccCg+5LZLkGFoeG+Ziy2vF 4pNiEnWv6NeZ5lhy0d6Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sBUnW-0000000E4Bn-0S6f; Mon, 27 May 2024 07:29:34 +0000 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sBUnS-0000000E4BC-1vdt for barebox@lists.infradead.org; Mon, 27 May 2024 07:29:31 +0000 Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1sBUnJ-00088O-6P; Mon, 27 May 2024 09:29:21 +0200 Received: from [2a0a:edc0:0:1101:1d::28] (helo=dude02.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1sBUnI-0039jV-Lm; Mon, 27 May 2024 09:29:20 +0200 Received: from localhost ([::1] helo=dude02.red.stw.pengutronix.de) by dude02.red.stw.pengutronix.de with esmtp (Exim 4.96) (envelope-from ) id 1sBUnI-00DY4f-1n; Mon, 27 May 2024 09:29:20 +0200 From: Sascha Hauer To: Barebox List Date: Mon, 27 May 2024 09:29:13 +0200 Message-Id: <20240527072915.3229221-3-s.hauer@pengutronix.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240527072915.3229221-1-s.hauer@pengutronix.de> References: <20240527072915.3229221-1-s.hauer@pengutronix.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240527_002930_527640_3FA832A9 X-CRM114-Status: GOOD ( 14.84 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: jianqiang wang Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.whiteo.stw.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-5.1 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH 3/5] net: ks8851_mll: do not read past the receive buffer X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.whiteo.stw.pengutronix.de) the hardware may report a packet longer than our receive buffer. Instead of reading past the receive buffer, discard too long packets. Signed-off-by: Sascha Hauer --- drivers/net/ks8851_mll.c | 28 +++++++++++++++++++++++++--- 1 file changed, 25 insertions(+), 3 deletions(-) diff --git a/drivers/net/ks8851_mll.c b/drivers/net/ks8851_mll.c index 2120657bd9..5e41888b28 100644 --- a/drivers/net/ks8851_mll.c +++ b/drivers/net/ks8851_mll.c @@ -420,6 +420,23 @@ static inline void ks_inblk(struct ks_net *ks, u16 *wptr, u32 len) *wptr++ = (u16)readw(ks->hw_addr); } +/** + * ks_discardblk - read a block of data from QMU discarding the data + * @ks: The chip state + * @len: length in byte to read + * + * This discards a block of data, used when a packet is longer than our receive + * buffer. I don't know if it is necessary to discard the data like this, but + * it is the easy way out to fix the behaviour with too large packets without + * risking regressions. + */ +static inline void ks_discardblk(struct ks_net *ks, u32 len) +{ + len >>= 1; + while (len--) + (void)readw(ks->hw_addr); +} + /** * ks_outblk - write data to QMU. * @ks: The chip information @@ -676,9 +693,14 @@ static int ks8851_rx_frame(struct ks_net *ks) tmp_rxqcr = ks_rdreg16(ks, KS_RXQCR); ks_wrreg16(ks, KS_RXQCR, tmp_rxqcr | RXQCR_SDA); - /* read 2 bytes for dummy, 2 for status, 2 for len*/ - ks_inblk(ks, ks->rx_buf, 2 + 2 + 2); - ks_inblk(ks, ks->rx_buf, ALIGN(RxLen, 4)); + if (RxLen <= PKTSIZE) { + /* read 2 bytes for dummy, 2 for status, 2 for len*/ + ks_inblk(ks, ks->rx_buf, 2 + 2 + 2); + ks_inblk(ks, ks->rx_buf, ALIGN(RxLen, 4)); + } else { + ks_discardblk(ks, 2 + 2 + 2 + ALIGN(RxLen, 4)); + } + ks_wrreg16(ks, KS_RXQCR, tmp_rxqcr); if (RxStatus & RXFSHR_RXFV) { -- 2.39.2