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If there is a system with a bpf consumer running and a packet is wanted

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to be transmitted but the arp cache entry expired, which triggers an arp request
to be sent, the bpf code might want to sleep but crash the system due
to a non sleep lock held from the arp entry not released properly.

Release the lock before calling the arp request code to solve the issue
as is done on all the other code paths.

PR:	200323
Approved by: ae, gnn(mentor)
MFC after:	1 week
Sponsored by:	Netgate
Differential Revision:	https://reviews.freebsd.org/D2828
This commit is contained in:
Ermal Luçi 2015-06-17 12:23:04 +00:00
parent 1fa1d4a651
commit f0516b3c96
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=284512
1 changed files with 12 additions and 3 deletions
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15
sys/netinet/if_ether.c
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@ -364,6 +364,7 @@ arpresolve(struct ifnet *ifp, int is_gw, struct mbuf *m,
if ((la->la_flags & LLE_VALID) &&
((la->la_flags & LLE_STATIC) || la->la_expire > time_uptime)) {
bcopy(&la->ll_addr, desten, ifp->if_addrlen);
renew = 0;
/*
* If entry has an expiry time and it is approaching,
* see if we need to send an ARP request within this
@ -371,14 +372,22 @@ arpresolve(struct ifnet *ifp, int is_gw, struct mbuf *m,
*/
if (!(la->la_flags & LLE_STATIC) &&
time_uptime + la->la_preempt > la->la_expire) {
arprequest(ifp, NULL, &SIN(dst)->sin_addr, NULL);
renew = 1;
la->la_preempt--;
}
if (pflags != NULL)
*pflags = la->la_flags;
error = 0;
goto done;
if (flags & LLE_EXCLUSIVE)
LLE_WUNLOCK(la);
else
LLE_RUNLOCK(la);
if (renew == 1)
arprequest(ifp, NULL, &SIN(dst)->sin_addr, NULL);
return (0);
}
if (la->la_flags & LLE_STATIC) { /* should not happen! */