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Hyunwoo Kim a5de36d6ce tls: Fix race condition in tls_sw_cancel_work_tx()

[ Upstream commit 7bb09315f9 ]

This issue was discovered during a code audit.

After cancel_delayed_work_sync() is called from tls_sk_proto_close(),
tx_work_handler() can still be scheduled from paths such as the
Delayed ACK handler or ksoftirqd.
As a result, the tx_work_handler() worker may dereference a freed
TLS object.

The following is a simple race scenario:

          cpu0                         cpu1

tls_sk_proto_close()
  tls_sw_cancel_work_tx()
                                 tls_write_space()
                                   tls_sw_write_space()
                                     if (!test_and_set_bit(BIT_TX_SCHEDULED, &tx_ctx->tx_bitmask))
    set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask);
    cancel_delayed_work_sync(&ctx->tx_work.work);
                                     schedule_delayed_work(&tx_ctx->tx_work.work, 0);

To prevent this race condition, cancel_delayed_work_sync() is
replaced with disable_delayed_work_sync().

Fixes: f87e62d45e ("net/tls: remove close callback sock unlock/lock around TX work flush")
Signed-off-by: Hyunwoo Kim <imv4bel@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Link: https://patch.msgid.link/aZgsFO6nfylfvLE7@v4bel
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2026-03-04 07:21:33 -05:00

Kconfig

net: skbuff: generalize the skb->decrypted bit

2024-04-06 17:34:31 +01:00

Makefile

…

tls_device_fallback.c

Revert "net: mirror skb frag ref/unref helpers"

2024-05-03 16:05:53 -07:00

tls_device.c

tls: Use __sk_dst_get() and dst_dev_rcu() in get_netdev_for_sock().

2026-01-17 16:31:18 +01:00