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authorChidambar 'ilLogict' Zinnoury <illogict@online.fr>2008-03-11 18:05:02 -0700
committerDavid S. Miller <davem@davemloft.net>2008-03-11 18:05:02 -0700
commit22626216c46f2ec86287e75ea86dd9ac3df54265 (patch)
treeee7fb381a17fb8105b7f2f8cd40cc4b587d064d0 /net/sctp/bind_addr.c
parentb2211a361a4289c83971f89da53fe2eb9e72769d (diff)
downloadlwn-22626216c46f2ec86287e75ea86dd9ac3df54265.tar.gz
lwn-22626216c46f2ec86287e75ea86dd9ac3df54265.zip
[SCTP]: Fix local_addr deletions during list traversals.
Since the lists are circular, we need to explicitely tag the address to be deleted since we might end up freeing the list head instead. This fixes some interesting SCTP crashes. Signed-off-by: Chidambar 'ilLogict' Zinnoury <illogict@online.fr> Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp/bind_addr.c')
-rw-r--r--net/sctp/bind_addr.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/net/sctp/bind_addr.c b/net/sctp/bind_addr.c
index a27511ebc4cb..ceefda025e2d 100644
--- a/net/sctp/bind_addr.c
+++ b/net/sctp/bind_addr.c
@@ -209,6 +209,7 @@ int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new,
int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
{
struct sctp_sockaddr_entry *addr, *temp;
+ int found = 0;
/* We hold the socket lock when calling this function,
* and that acts as a writer synchronizing lock.
@@ -216,13 +217,14 @@ int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
/* Found the exact match. */
+ found = 1;
addr->valid = 0;
list_del_rcu(&addr->list);
break;
}
}
- if (addr && !addr->valid) {
+ if (found) {
call_rcu(&addr->rcu, sctp_local_addr_free);
SCTP_DBG_OBJCNT_DEC(addr);
return 0;