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net: tls: fix messing up lists when bpf enabled

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Artem points out that skb may try to take over the skb and
queue it to its own list. Unlink the skb before calling out.

Fixes: b1a2c17863 ("tls: rx: clear ctx->recv_pkt earlier")
Reported-by: Artem Savkov <asavkov@redhat.com>
Tested-by: Artem Savkov <asavkov@redhat.com>
Link: https://lore.kernel.org/r/20220518205644.2059468-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski
2022-05-18 13:56:44 -07:00
parent df98714e43
commit 1c2133114d
1 changed files with 3 additions and 1 deletions
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4
net/tls/tls_sw.c
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@@ -1837,15 +1837,17 @@ leave_on_list:
bool partially_consumed = chunk > len;
if (bpf_strp_enabled) {
/* BPF may try to queue the skb */
__skb_unlink(skb, &ctx->rx_list);
err = sk_psock_tls_strp_read(psock, skb);
if (err != __SK_PASS) {
rxm->offset = rxm->offset + rxm->full_len;
rxm->full_len = 0;
__skb_unlink(skb, &ctx->rx_list);
if (err == __SK_DROP)
consume_skb(skb);
continue;
}
__skb_queue_tail(&ctx->rx_list, skb);
}
if (partially_consumed)