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net: tls: Fix deadlock in free_resources tx 

If there are outstanding async tx requests (when crypto returns EINPROGRESS),
there is a potential deadlock: the tx work acquires the lock, while we
cancel_delayed_work_sync() while holding the lock.  Drop the lock while waiting
for the work to complete.

Fixes: a42055e8d2 ("Add support for async encryption of records...")
Signed-off-by: Dave Watson <davejwatson@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dave Watson 2019-01-27 00:59:03 +00:00 committed by David S. Miller
parent 32eb67b93c
commit 1023121375
1 changed files with 2 additions and 0 deletions
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2
net/tls/tls_sw.c
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@ -1794,7 +1794,9 @@ void tls_sw_free_resources_tx(struct sock *sk)
if (atomic_read(&ctx->encrypt_pending))
crypto_wait_req(-EINPROGRESS, &ctx->async_wait);
release_sock(sk);
cancel_delayed_work_sync(&ctx->tx_work.work);
lock_sock(sk);
/* Tx whatever records we can transmit and abandon the rest */
tls_tx_records(sk, -1);