Re: [PATCH 6.1 1/1] tls: fix race between tx work scheduling and socket close

[Jakub Kicinski <kuba@kernel.org>]

On Thu,  7 Mar 2024 15:59:29 +0000 Lee Jones wrote:
> From: Jakub Kicinski <kuba@kernel.org>
> 
> [ Upstream commit e01e3934a1b2d122919f73bc6ddbe1cdafc4bbdb ]
> 
> Similarly to previous commit, the submitting thread (recvmsg/sendmsg)
> may exit as soon as the async crypto handler calls complete().
> Reorder scheduling the work before calling complete().
> This seems more logical in the first place, as it's
> the inverse order of what the submitting thread will do.
> 
> Reported-by: valis <sec@valis.email>
> Fixes: a42055e8d2c3 ("net/tls: Add support for async encryption of records for performance")
> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
> Reviewed-by: Simon Horman <horms@kernel.org>
> Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
> Signed-off-by: David S. Miller <davem@davemloft.net>
> Signed-off-by: Sasha Levin <sashal@kernel.org>
> (cherry picked from commit 6db22d6c7a6dc914b12c0469b94eb639b6a8a146)
> [Lee: Fixed merge-conflict in Stable branches linux-6.1.y and older]
> Signed-off-by: Lee Jones <lee@kernel.org>

LG, thank you!

The 5.15 / 5.10 / 5.4 fixes won't be effective, tho. I don't see
commit aec7961916f3f9e88766 in the other LTS branches. Without that
(it's still correct but) it doesn't fix the problem, because we still
touch the context after releasing the reference (unlocking the spin
lock).