Commit 3cdaedae authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

tcp: Fix a connect() race with timewait sockets

When we find a timewait connection in __inet_hash_connect() and reuse
it for a new connection request, we have a race window, releasing bind
list lock and reacquiring it in __inet_twsk_kill() to remove timewait
socket from list.

Another thread might find the timewait socket we already chose, leading to
list corruption and crashes.

Fix is to remove timewait socket from bind list before releasing the bind lock.

Note: This problem happens if sysctl_tcp_tw_reuse is set.
Reported-by: default avatarkapil dakhane <>
Signed-off-by: default avatarEric Dumazet <>
Signed-off-by: default avatarDavid S. Miller <>
parent 9327f705
......@@ -201,6 +201,9 @@ extern void inet_twsk_put(struct inet_timewait_sock *tw);
extern int inet_twsk_unhash(struct inet_timewait_sock *tw);
extern int inet_twsk_bind_unhash(struct inet_timewait_sock *tw,
struct inet_hashinfo *hashinfo);
extern struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk,
const int state);
......@@ -502,6 +502,8 @@ ok:
inet_sk(sk)->inet_sport = htons(port);
twrefcnt += hash(sk, tw);
if (tw)
twrefcnt += inet_twsk_bind_unhash(tw, hinfo);
if (tw) {
......@@ -29,12 +29,29 @@ int inet_twsk_unhash(struct inet_timewait_sock *tw)
return 1;
* unhash a timewait socket from bind hash
* lock must be hold by caller
int inet_twsk_bind_unhash(struct inet_timewait_sock *tw,
struct inet_hashinfo *hashinfo)
struct inet_bind_bucket *tb = tw->tw_tb;
if (!tb)
return 0;
tw->tw_tb = NULL;
inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb);
return 1;
/* Must be called with locally disabled BHs. */
static void __inet_twsk_kill(struct inet_timewait_sock *tw,
struct inet_hashinfo *hashinfo)
struct inet_bind_hashbucket *bhead;
struct inet_bind_bucket *tb;
int refcnt;
/* Unlink from established hashes. */
spinlock_t *lock = inet_ehash_lockp(hashinfo, tw->tw_hash);
......@@ -46,15 +63,11 @@ static void __inet_twsk_kill(struct inet_timewait_sock *tw,
/* Disassociate with bind bucket. */
bhead = &hashinfo->bhash[inet_bhashfn(twsk_net(tw), tw->tw_num,
tb = tw->tw_tb;
if (tb) {
tw->tw_tb = NULL;
inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb);
refcnt += inet_twsk_bind_unhash(tw, hashinfo);
if (atomic_read(&tw->tw_refcnt) != 1) {
printk(KERN_DEBUG "%s timewait_sock %p refcnt=%d\n",
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