6.6-stable review patch. If anyone has any objections, please let me know.
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From: Sabrina Dubroca sd@queasysnail.net
[ Upstream commit b8a6ff84abbcbbc445463de58704686011edc8e1 ]
Async decryption calls tls_strp_msg_hold to create a clone of the input skb to hold references to the memory it uses. If we fail to allocate that clone, proceeding with async decryption can lead to various issues (UAF on the skb, writing into userspace memory after the recv() call has returned).
In this case, wait for all pending decryption requests.
Fixes: 84c61fe1a75b ("tls: rx: do not use the standard strparser") Reported-by: Jann Horn jannh@google.com Signed-off-by: Sabrina Dubroca sd@queasysnail.net Link: https://patch.msgid.link/b9fe61dcc07dab15da9b35cf4c7d86382a98caf2.1760432043... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/tls/tls_sw.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c index d3bf2dbc297ae..6ea557ebab171 100644 --- a/net/tls/tls_sw.c +++ b/net/tls/tls_sw.c @@ -1637,8 +1637,10 @@ static int tls_decrypt_sg(struct sock *sk, struct iov_iter *out_iov,
if (unlikely(darg->async)) { err = tls_strp_msg_hold(&ctx->strp, &ctx->async_hold); - if (err) - __skb_queue_tail(&ctx->async_hold, darg->skb); + if (err) { + err = tls_decrypt_async_wait(ctx); + darg->async = false; + } return err; }