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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2019-12-05 08:45:05 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-02-05 16:05:42 +0300 |
| commit | 7e202553cff41e7ea3b866beb331588404ad6a7a (patch) | |
| tree | 8074c302970475125f5405eeafc774039d737da6 /crypto | |
| parent | 39f139df74785d6334bf44baa2cf4f60aa6f33a1 (diff) | |
| download | linux-7e202553cff41e7ea3b866beb331588404ad6a7a.tar.xz | |
crypto: af_alg - Use bh_lock_sock in sk_destruct
commit 37f96694cf73ba116993a9d2d99ad6a75fa7fdb0 upstream.
As af_alg_release_parent may be called from BH context (most notably
due to an async request that only completes after socket closure,
or as reported here because of an RCU-delayed sk_destruct call), we
must use bh_lock_sock instead of lock_sock.
Reported-by: syzbot+c2f1558d49e25cc36e5e@syzkaller.appspotmail.com
Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Fixes: c840ac6af3f8 ("crypto: af_alg - Disallow bind/setkey/...")
Cc: <stable@vger.kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'crypto')
| -rw-r--r-- | crypto/af_alg.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/crypto/af_alg.c b/crypto/af_alg.c index b5953f1d1a18..cf3975ee4fd8 100644 --- a/crypto/af_alg.c +++ b/crypto/af_alg.c @@ -136,11 +136,13 @@ void af_alg_release_parent(struct sock *sk) sk = ask->parent; ask = alg_sk(sk); - lock_sock(sk); + local_bh_disable(); + bh_lock_sock(sk); ask->nokey_refcnt -= nokey; if (!last) last = !--ask->refcnt; - release_sock(sk); + bh_unlock_sock(sk); + local_bh_enable(); if (last) sock_put(sk); |