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fix use after free issue in mbuf free #565

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merged 1 commit into from
Jan 7, 2021
Merged

fix use after free issue in mbuf free #565

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4 changes: 2 additions & 2 deletions lib/ff_dpdk_if.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1150,7 +1150,7 @@ ff_veth_input(const struct ff_dpdk_if_context *ctx, struct rte_mbuf *pkt)
data = rte_pktmbuf_mtod(pn, void*);
len = rte_pktmbuf_data_len(pn);

void *mb = ff_mbuf_get(prev, data, len);
void *mb = ff_mbuf_get(prev, pn, data, len);
if (mb == NULL) {
ff_mbuf_free(hdr);
rte_pktmbuf_free(pkt);
Expand Down Expand Up @@ -1967,7 +1967,7 @@ ff_dpdk_run(loop_func_t loop, void *arg) {
void
ff_dpdk_pktmbuf_free(void *m)
{
rte_pktmbuf_free((struct rte_mbuf *)m);
rte_pktmbuf_free_seg((struct rte_mbuf *)m);
}

static uint32_t
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6 changes: 3 additions & 3 deletions lib/ff_veth.c
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Original file line number Diff line number Diff line change
Expand Up @@ -209,16 +209,16 @@ ff_mbuf_gethdr(void *pkt, uint16_t total, void *data,
}

void *
ff_mbuf_get(void *m, void *data, uint16_t len)
ff_mbuf_get(void *p, void *m, void *data, uint16_t len)
{
struct mbuf *prev = (struct mbuf *)m;
struct mbuf *prev = (struct mbuf *)p;
struct mbuf *mb = m_get(M_NOWAIT, MT_DATA);

if (mb == NULL) {
return NULL;
}

m_extadd(mb, data, len, NULL, NULL, NULL, 0, 0);
m_extadd(mb, data, len, ff_mbuf_ext_free, m, NULL, 0, EXT_DISPOSABLE);

mb->m_next = NULL;
mb->m_nextpkt = NULL;
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2 changes: 1 addition & 1 deletion lib/ff_veth.h
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Original file line number Diff line number Diff line change
Expand Up @@ -33,7 +33,7 @@ int ff_veth_detach(void *arg);

void *ff_mbuf_gethdr(void *pkt, uint16_t total, void *data,
uint16_t len, uint8_t rx_csum);
void *ff_mbuf_get(void *m, void *data, uint16_t len);
void *ff_mbuf_get(void *p, void *m, void *data, uint16_t len);
void ff_mbuf_free(void *m);

int ff_mbuf_copydata(void *m, void *data, int off, int len);
Expand Down