From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 80689A04F5; Fri, 19 Jun 2020 10:22:20 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 5C6DB5F2F; Fri, 19 Jun 2020 10:22:20 +0200 (CEST) Received: from dispatch1-us1.ppe-hosted.com (dispatch1-us1.ppe-hosted.com [67.231.154.164]) by dpdk.org (Postfix) with ESMTP id DEEB95B3C for ; Fri, 19 Jun 2020 10:22:18 +0200 (CEST) Received: from mx1-us1.ppe-hosted.com (unknown [10.110.50.143]) by dispatch1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTP id 7A5CE2004D; Fri, 19 Jun 2020 08:22:18 +0000 (UTC) Received: from us4-mdac16-2.at1.mdlocal (unknown [10.110.49.148]) by mx1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTP id 78B598009B; Fri, 19 Jun 2020 08:22:18 +0000 (UTC) X-Virus-Scanned: Proofpoint Essentials engine Received: from mx1-us1.ppe-hosted.com (unknown [10.110.50.12]) by 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SMEX-12.5.0.1300-8.5.1020-25490.003 X-TM-AS-Result: No-3.094200-8.000000-10 X-TMASE-MatchedRID: hls5oAVArl8iG+Ecn/HaC6fOxh7hvX710fmgp1LZj2jk1kyQDpEj8G0n tbkawSZ1W3UnKumFTG5FqWsk38ReFy+O0w9NM5ryuLHENGl+3A/pVMb1xnESMmGyjhKjnGZNg6y Wh0b+Emf++JkBOzm/S27kamKGhf/8OWTlId8Di5d+J3gtIe0gAyYof8qPjr5VXNskCLL/AEjQDj kgBdHEzbNQlIvE8NmdmxwLkNXVJ7liWV0DQ85LUub3p4cnIXGNljXTOadSXWmjC7FwoZvBwHAO1 glaOi0Ffms0JrscsW68SZcSrbjehE1+zyfzlN7ygxsfzkNRlfKx5amWK2anSPoLR4+zsDTtSeDA qzk56OdysUeHiHuOHroFOY29uf/lQSAbkG/PmYEnDut/oYCsAv74+M3fh3JtU/a/V2rD5ug1EXY q6Qqt73W3y8y/mwiDO1zLzTMQXC1R029mOM6P0LrcE8xytxC5d5hZXZFoB8PxWx93BSYyycC+ks T6a9fy X-TM-AS-User-Approved-Sender: Yes X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--3.094200-8.000000 X-TMASE-Version: SMEX-12.5.0.1300-8.5.1020-25490.003 X-MDID: 1592554938-KtY4jHm29gU1 Subject: Re: [dpdk-dev] [PATCH 1/2] ethdev: fix data room size verification in Rx queue setup 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" On 6/19/20 6:42 AM, Wei Hu (Xavier) wrote: > From: Chengchang Tang > > In the rte_eth_rx_queue_setup API function, the local variable named > mbp_buf_size, which is the data room size of the input parameter mp, > is checked to guarantee that each memory chunck used for net device > in the mbuf is bigger than the min_rx_bufsize. But if mbp_buf_size is > less than RTE_PKTMBUF_HEADROOM, the value of the following statement > will be a large number since the mbp_buf_size is a unsigned value. > mbp_buf_size - RTE_PKTMBUF_HEADROOM > As a result, it will cause a segment fault in this situation. > > This patch fixes it by adding a check condition to guarantee that the > local varibale named mbp_buf_size is bigger than RTE_PKTMBUF_HEADROOM. > > Fixes: af75078fece3 ("first public release") > Cc: stable@dpdk.org > > Signed-off-by: Chengchang Tang > Signed-off-by: Wei Hu (Xavier) > --- > lib/librte_ethdev/rte_ethdev.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c > index 8e10a6f..122fd2a 100644 > --- a/lib/librte_ethdev/rte_ethdev.c > +++ b/lib/librte_ethdev/rte_ethdev.c > @@ -1822,7 +1822,8 @@ rte_eth_rx_queue_setup(uint16_t port_id, uint16_t rx_queue_id, > } > mbp_buf_size = rte_pktmbuf_data_room_size(mp); > > - if ((mbp_buf_size - RTE_PKTMBUF_HEADROOM) < dev_info.min_rx_bufsize) { > + if (mbp_buf_size < RTE_PKTMBUF_HEADROOM || > + (mbp_buf_size - RTE_PKTMBUF_HEADROOM) < dev_info.min_rx_bufsize) { May be it could be shorten to mbp_buf_size < dev_info.min_rx_bufsize + RTE_PKTMBUF_HEADROOM However, way suggested in the patch is 100% safe against integer overflow. > RTE_ETHDEV_LOG(ERR, > "%s mbuf_data_room_size %d < %d (RTE_PKTMBUF_HEADROOM=%d + min_rx_bufsize(dev)=%d)\n", > mp->name, (int)mbp_buf_size, > Reviewed-by: Andrew Rybchenko