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net/tls: avoid potential deadlock in tls_set_device_offload_rx()

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[ Upstream commit 62ef81d563 ]

If device supports offload, but offload fails tls_set_device_offload_rx()
will call tls_sw_free_resources_rx() which (unhelpfully) releases
and reacquires the socket lock.

For a small fix release and reacquire the device_offload_lock.

Fixes: 4799ac81e5 ("tls: Add rx inline crypto offload")
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jakub Kicinski
2019-04-19 16:51:38 -07:00
committed by Greg Kroah-Hartman
parent 041b3224e8
commit d3bdd359fa
1 changed files with 2 additions and 0 deletions
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2
net/tls/tls_device.c
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@@ -874,7 +874,9 @@ int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx)
goto release_netdev;
free_sw_resources:
up_read(&device_offload_lock);
tls_sw_free_resources_rx(sk);
down_read(&device_offload_lock);
release_ctx:
ctx->priv_ctx_rx = NULL;
release_netdev: