Re: [PATCH v2 0/2] ASoC: soc-core: fix use-after-free in close_delayed_work

[Mark Brown <broonie@kernel.org>]

On Mon, 09 Mar 2026 22:54:10 +0100, matteo.cotifava wrote:
> Fix a use-after-free in snd_soc_dapm_stream_event() triggered when a
> sound card is unbound while a PCM close delayed work is pending.
> 
> As Mark pointed out in v1 review, flush_delayed_work() does handle
> pending timers correctly. The actual issue appears to be new work
> getting scheduled after the flush: snd_card_disconnect_sync() inside
> soc_cleanup_card_resources() can trigger PCM closes which call
> snd_soc_dapm_stream_stop(), scheduling new delayed work after the
> flush in snd_soc_unbind_card() has already completed. If the timer
> fires after soc_remove_link_components() frees the DAPM widgets,
> the work accesses freed memory.
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next

Thanks!

[1/2] ASoC: soc-core: drop delayed_work_pending() check before flush
      commit: 3c99c9f0ed60582c1c9852b685d78d5d3a50de63
[2/2] ASoC: soc-core: flush delayed work before removing DAIs and widgets
      commit: 95bc5c225513fc3c4ce169563fb5e3929fbb938b

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
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Thanks,
Mark