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Code Issues Releases Activity

Add a check to know whether driver is still running after

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reacquiring driver lock in Rx handler. re(4) drops a driver lock
before passing received frame to upper stack and reacquire the
lock. During the time window ioctl calls could be executed and if
the ioctl was interface down request, driver will stop the
controller and free allocated mbufs. After that when driver comes
back to Rx handler again it does not know what was happend so it
could access free mbufs which in turn cause panic.

Reported by:	 Norbert Papke < npapk <> acm dot org >
Tested by:	 Norbert Papke < npapk <> acm dot org >
This commit is contained in:
Pyun YongHyeon 2009-11-02 18:35:05 +00:00
parent bb08f03318
commit 5b6d1d9d08
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=198814
1 changed files with 2 additions and 0 deletions
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2
sys/dev/re/if_re.c
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@ -1817,6 +1817,8 @@ re_rxeof(struct rl_softc *sc, int *rx_npktsp)
for (i = sc->rl_ldata.rl_rx_prodidx; maxpkt > 0;
i = RL_RX_DESC_NXT(sc, i)) {
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
break;
cur_rx = &sc->rl_ldata.rl_rx_list[i];
rxstat = le32toh(cur_rx->rl_cmdstat);
if ((rxstat & RL_RDESC_STAT_OWN) != 0)