From 518f6e2bd250b9c03d4581e6b2e3b49d423c0e7e Mon Sep 17 00:00:00 2001 From: yongari Date: Fri, 14 May 2010 17:39:28 +0000 Subject: If controller received bad frames make sure to update newly added RFA. Also drop frames that have either CRC error or alignment error. Normally bad frames are not received at all. But controllers running in promiscuous mode will receive bad frames. 82557 will also receive bad frames to receive VLAN oversized frames. While I'm here mark RNR condition if driver happen to see RNR in RFA status and restart RU to receive frames again. Because driver checks all received frames in RX loop, RNR condition could be set in the middle of RX processing. Just relying on RNR interrupt was not enough. This change fixes "Memory modified after free" issue when fxp(4) is running as a member of if_bridge(4). Tested by: Larry Baird gta dot com> MFC after: 5 days --- sys/dev/fxp/if_fxp.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'sys/dev') diff --git a/sys/dev/fxp/if_fxp.c b/sys/dev/fxp/if_fxp.c index 006ec52..079ecc1 100644 --- a/sys/dev/fxp/if_fxp.c +++ b/sys/dev/fxp/if_fxp.c @@ -1916,6 +1916,8 @@ fxp_intr_body(struct fxp_softc *sc, struct ifnet *ifp, uint8_t statack, if ((status & FXP_RFA_STATUS_C) == 0) break; + if ((status & FXP_RFA_STATUS_RNR) != 0) + rnr++; /* * Advance head forward. */ @@ -1942,9 +1944,12 @@ fxp_intr_body(struct fxp_softc *sc, struct ifnet *ifp, uint8_t statack, total_len -= 2; } if (total_len < sizeof(struct ether_header) || - total_len > MCLBYTES - RFA_ALIGNMENT_FUDGE - - sc->rfa_size || status & FXP_RFA_STATUS_CRC) { + total_len > (MCLBYTES - RFA_ALIGNMENT_FUDGE - + sc->rfa_size) || + status & (FXP_RFA_STATUS_CRC | + FXP_RFA_STATUS_ALIGN)) { m_freem(m); + fxp_add_rfabuf(sc, rxp); continue; } -- cgit v1.1