From patchwork Tue Feb 20 07:34:01 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Rybchenko X-Patchwork-Id: 35277 X-Patchwork-Delegate: ferruh.yigit@amd.com Return-Path: X-Original-To: patchwork@dpdk.org Delivered-To: patchwork@dpdk.org Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 2B9A81B3F0; Tue, 20 Feb 2018 08:36:10 +0100 (CET) Received: from dispatch1-us1.ppe-hosted.com (dispatch1-us1.ppe-hosted.com [67.231.154.164]) by dpdk.org (Postfix) with ESMTP id 58C291B1B3 for ; Tue, 20 Feb 2018 08:35:39 +0100 (CET) X-Virus-Scanned: Proofpoint Essentials engine Received: from webmail.solarflare.com (webmail.solarflare.com [12.187.104.26]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1-us1.ppe-hosted.com (Proofpoint Essentials ESMTP Server) with ESMTPS id 5ACAEB00056 for ; Tue, 20 Feb 2018 07:35:38 +0000 (UTC) Received: from sfocexch01r.SolarFlarecom.com (10.20.40.34) by ocex03.SolarFlarecom.com (10.20.40.36) with Microsoft SMTP Server (TLS) id 15.0.1044.25; Mon, 19 Feb 2018 23:35:35 -0800 Received: from ocex03.SolarFlarecom.com (10.20.40.36) by sfocexch01r.SolarFlarecom.com (10.20.40.34) with Microsoft SMTP Server (TLS) id 15.0.1044.25; Mon, 19 Feb 2018 23:35:15 -0800 Received: from opal.uk.solarflarecom.com (10.17.10.1) by ocex03.SolarFlarecom.com (10.20.40.36) with Microsoft SMTP Server (TLS) id 15.0.1044.25 via Frontend Transport; Mon, 19 Feb 2018 23:35:14 -0800 Received: from uklogin.uk.solarflarecom.com (uklogin.uk.solarflarecom.com [10.17.10.10]) by opal.uk.solarflarecom.com (8.13.8/8.13.8) with ESMTP id w1K7ZDmp025114; Tue, 20 Feb 2018 07:35:13 GMT Received: from uklogin.uk.solarflarecom.com (localhost.localdomain [127.0.0.1]) by uklogin.uk.solarflarecom.com (8.13.8/8.13.8) with ESMTP id w1K7ZBtt020529; Tue, 20 Feb 2018 07:35:13 GMT From: Andrew Rybchenko To: CC: Richard Houldsworth Date: Tue, 20 Feb 2018 07:34:01 +0000 Message-ID: <1519112078-20113-44-git-send-email-arybchenko@solarflare.com> X-Mailer: git-send-email 1.8.2.3 In-Reply-To: <1519112078-20113-1-git-send-email-arybchenko@solarflare.com> References: <1519112078-20113-1-git-send-email-arybchenko@solarflare.com> MIME-Version: 1.0 X-MDID: 1519112139-ABj7ICizUiq5 Subject: [dpdk-dev] [PATCH 43/80] net/sfc/base: resolve code analysis warnings X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" From: Richard Houldsworth Minimal changes adding buffer size checks and simplifying checksum processing. Signed-off-by: Richard Houldsworth Signed-off-by: Andrew Rybchenko --- drivers/net/sfc/base/efx_bootcfg.c | 67 +++++++++++++++++++++++++++----------- 1 file changed, 48 insertions(+), 19 deletions(-) diff --git a/drivers/net/sfc/base/efx_bootcfg.c b/drivers/net/sfc/base/efx_bootcfg.c index 3a29306..715e18e 100644 --- a/drivers/net/sfc/base/efx_bootcfg.c +++ b/drivers/net/sfc/base/efx_bootcfg.c @@ -209,19 +209,25 @@ efx_bootcfg_copy_sector( size_t used_bytes; efx_rc_t rc; + /* Minimum buffer is checksum byte and DHCP_END terminator */ + if (data_size < 2) { + rc = ENOSPC; + goto fail1; + } + /* Verify that the area is correctly formatted and checksummed */ rc = efx_bootcfg_verify(enp, sector, sector_length, &used_bytes); if (!handle_format_errors) { if (rc != 0) - goto fail1; + goto fail2; if ((used_bytes < 2) || (sector[used_bytes - 1] != DHCP_END)) { /* Block too short, or DHCP_END missing */ rc = ENOENT; - goto fail2; + goto fail3; } } @@ -255,9 +261,13 @@ efx_bootcfg_copy_sector( */ if (used_bytes > data_size) { rc = ENOSPC; - goto fail3; + goto fail4; } - memcpy(data, sector, used_bytes); + + data[0] = 0; /* checksum, updated below */ + + /* Copy all after the checksum to the target buffer */ + memcpy(data + 1, sector + 1, used_bytes - 1); /* Zero out the unused portion of the target buffer */ if (used_bytes < data_size) @@ -271,6 +281,8 @@ efx_bootcfg_copy_sector( return (0); +fail4: + EFSYS_PROBE(fail4); fail3: EFSYS_PROBE(fail3); fail2: @@ -295,6 +307,12 @@ efx_bootcfg_read( efx_rc_t rc; uint32_t sector_number; + /* Minimum buffer is checksum byte and DHCP_END terminator */ + if (size < 2) { + rc = ENOSPC; + goto fail1; + } + #if EFSYS_OPT_HUNTINGTON || EFSYS_OPT_MEDFORD || EFSYS_OPT_MEDFORD2 sector_number = enp->en_nic_cfg.enc_pf; #else @@ -302,13 +320,18 @@ efx_bootcfg_read( #endif rc = efx_nvram_size(enp, EFX_NVRAM_BOOTROM_CFG, &partn_length); if (rc != 0) - goto fail1; + goto fail2; /* The bootcfg sector may be stored in a (larger) shared partition */ rc = efx_bootcfg_sector_info(enp, sector_number, NULL, §or_offset, §or_length); if (rc != 0) - goto fail2; + goto fail3; + + if (sector_length < 2) { + rc = EINVAL; + goto fail4; + } if (sector_length > BOOTCFG_MAX_SIZE) sector_length = BOOTCFG_MAX_SIZE; @@ -316,7 +339,7 @@ efx_bootcfg_read( if (sector_offset + sector_length > partn_length) { /* Partition is too small */ rc = EFBIG; - goto fail3; + goto fail5; } /* @@ -329,28 +352,28 @@ efx_bootcfg_read( EFSYS_KMEM_ALLOC(enp->en_esip, sector_length, payload); if (payload == NULL) { rc = ENOMEM; - goto fail4; + goto fail6; } } else payload = (uint8_t *)data; if ((rc = efx_nvram_rw_start(enp, EFX_NVRAM_BOOTROM_CFG, NULL)) != 0) - goto fail5; + goto fail7; if ((rc = efx_nvram_read_chunk(enp, EFX_NVRAM_BOOTROM_CFG, sector_offset, (caddr_t)payload, sector_length)) != 0) { (void) efx_nvram_rw_finish(enp, EFX_NVRAM_BOOTROM_CFG, NULL); - goto fail6; + goto fail8; } if ((rc = efx_nvram_rw_finish(enp, EFX_NVRAM_BOOTROM_CFG, NULL)) != 0) - goto fail7; + goto fail9; /* Verify that the area is correctly formatted and checksummed */ rc = efx_bootcfg_verify(enp, payload, sector_length, &used_bytes); if (rc != 0 || used_bytes == 0) { - payload[0] = (uint8_t)(~DHCP_END & 0xff); + payload[0] = 0; payload[1] = DHCP_END; used_bytes = 2; } @@ -365,10 +388,8 @@ efx_bootcfg_read( * so reinitialise the sector if there isn't room for the character. */ if (payload[used_bytes - 1] != DHCP_END) { - if (used_bytes + 1 > sector_length) { - payload[0] = 0; + if (used_bytes >= sector_length) used_bytes = 1; - } payload[used_bytes] = DHCP_END; ++used_bytes; @@ -380,10 +401,14 @@ efx_bootcfg_read( */ if (used_bytes > size) { rc = ENOSPC; - goto fail8; + goto fail10; } + + data[0] = 0; /* checksum, updated below */ + if (sector_length > size) { - memcpy(data, payload, used_bytes); + /* Copy all after the checksum to the target buffer */ + memcpy(data + 1, payload + 1, used_bytes - 1); EFSYS_KMEM_FREE(enp->en_esip, sector_length, payload); } @@ -399,16 +424,20 @@ efx_bootcfg_read( return (0); +fail10: + EFSYS_PROBE(fail10); +fail9: + EFSYS_PROBE(fail9); fail8: EFSYS_PROBE(fail8); fail7: EFSYS_PROBE(fail7); + if (sector_length > size) + EFSYS_KMEM_FREE(enp->en_esip, sector_length, payload); fail6: EFSYS_PROBE(fail6); fail5: EFSYS_PROBE(fail5); - if (sector_length > size) - EFSYS_KMEM_FREE(enp->en_esip, sector_length, payload); fail4: EFSYS_PROBE(fail4); fail3: