d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Handle INP_FREED when looking up an inpcb

Browse Source 
When hash table lookups are not serialized with in_pcbfree it will be
possible for callers to find an inpcb that has been marked free. We
need to check for this and return NULL.
This commit is contained in:
mmacy 2018-06-13 04:23:49 +00:00
parent c4f7676726
commit 5fa208f76c
1 changed files with 8 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
sys/netinet/in_pcb.c
View File

@ -2209,7 +2209,14 @@ in_pcblookup_group(struct inpcbinfo *pcbinfo, struct inpcbgroup *pcbgroup,
locked = INP_TRY_RLOCK(inp);
else
panic("%s: locking bug", __func__);
if (!locked)
if (__predict_false(locked && (inp->inp_flags2 & INP_FREED))) {
if (lookupflags & INPLOOKUP_WLOCKPCB)
INP_WUNLOCK(inp);
else
INP_RUNLOCK(inp);
INP_HASH_RUNLOCK(pcbinfo);
return (NULL);
} else if (!locked)
in_pcbref(inp);
INP_GROUP_UNLOCK(pcbgroup);
if (!locked) {