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net/tls: don't leak IV and record seq when offload fails

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When device refuses the offload in tls_set_device_offload_rx()
it calls tls_sw_free_resources_rx() to clean up software context
state.

Unfortunately, tls_sw_free_resources_rx() does not free all
the state tls_set_sw_offload() allocated - it leaks IV and
sequence number buffers.  All other code paths which lead to
tls_sw_release_resources_rx() (which tls_sw_free_resources_rx()
calls) free those right before the call.

Avoid the leak by moving freeing of iv and rec_seq into
tls_sw_release_resources_rx().

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>
This commit is contained in:
Jakub Kicinski 2019-04-19 16:52:19 -07:00 committed by David S. Miller
parent 62ef81d563
commit 12c7686111
3 changed files with 4 additions and 6 deletions
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2
net/tls/tls_device.c
View File

@ -941,8 +941,6 @@ void tls_device_offload_cleanup_rx(struct sock *sk)
}
out:
up_read(&device_offload_lock);
kfree(tls_ctx->rx.rec_seq);
kfree(tls_ctx->rx.iv);
tls_sw_release_resources_rx(sk);
}

5
net/tls/tls_main.c
View File

@ -293,11 +293,8 @@ static void tls_sk_proto_close(struct sock *sk, long timeout)
#endif
}
if (ctx->rx_conf == TLS_SW) {
kfree(ctx->rx.rec_seq);
kfree(ctx->rx.iv);
if (ctx->rx_conf == TLS_SW)
tls_sw_free_resources_rx(sk);
}
#ifdef CONFIG_TLS_DEVICE
if (ctx->rx_conf == TLS_HW)

3
net/tls/tls_sw.c
View File

@ -2078,6 +2078,9 @@ void tls_sw_release_resources_rx(struct sock *sk)
struct tls_context *tls_ctx = tls_get_ctx(sk);
struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
kfree(tls_ctx->rx.rec_seq);
kfree(tls_ctx->rx.iv);
if (ctx->aead_recv) {
kfree_skb(ctx->recv_pkt);
ctx->recv_pkt = NULL;