From: "Purnima, Kompella V" <Kompella.Purnima@commscope.com>
To: "users@dpdk.org" <users@dpdk.org>
Subject: IP reassembly can cause memory corruption?
Date: Wed, 8 Dec 2021 20:49:15 +0000 [thread overview]
Message-ID: <DM6PR14MB35974A0905D0E64FAC99E8219C6F9@DM6PR14MB3597.namprd14.prod.outlook.com> (raw)
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HI
I am using DPDK 19.11 version. Following are my findings
struct rte_ip_frag_death_row {
uint32_t cnt; /**< number of mbufs currently on death row */
struct rte_mbuf *row[IP_FRAG_DEATH_ROW_MBUF_LEN];
/**< mbufs to be freed */
};
#define IP_FRAG_MBUF2DR(dr, mb) ((dr)->row[(dr)->cnt++] = (mb))
When calling IP_FRAG_MBUF2DR, there is no check for cnt < IP_FRAG_DEATH_ROW_MBUF_LEN.
So whenever (cnt >= IP_FRAG_DEATH_ROW_MBUF_LEN) happens IP_FRAG_MBUF2DR will corrupt memory due to array-bound overflow.
Late arrival or non-arrival of all fragments of packets - any of these common scenarios can cause the corruption!!
Is this a known issue?
Thanks
Purnima
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