ASoC: mediatek: mt8188: fix use-after-free in driver remove path
authorTrevor Wu <trevor.wu@mediatek.com>
Thu, 1 Jun 2023 03:33:17 +0000 (11:33 +0800)
committerMark Brown <broonie@kernel.org>
Thu, 1 Jun 2023 11:30:35 +0000 (12:30 +0100)
commitfd67a7a1a22ce47fcbc094c4b6e164c34c652cbe
tree9036dd42597dabce11dca87c19b138773c28a290
parent57d1e8900495cf1751cec74db16fe1a0fe47efbb
ASoC: mediatek: mt8188: fix use-after-free in driver remove path

During mt8188_afe_init_clock(), mt8188_audsys_clk_register() was called
followed by several other devm functions. The caller of
mt8188_afe_init_clock() utilized devm_add_action_or_reset() to call
mt8188_afe_deinit_clock(). However, the order was incorrect, causing a
use-after-free issue during remove time.

At probe time, the order of calls was:
1. mt8188_audsys_clk_register
2. afe_priv->clk = devm_kcalloc
3. afe_priv->clk[i] = devm_clk_get

At remove time, the order of calls was:
1. mt8188_audsys_clk_unregister
3. free afe_priv->clk[i]
2. free afe_priv->clk

To resolve the problem, it's necessary to move devm_add_action_or_reset()
to the appropriate position so that the remove order can be 3->2->1.

Fixes: f6b026479b13 ("ASoC: mediatek: mt8188: support audio clock control")
Signed-off-by: Trevor Wu <trevor.wu@mediatek.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230601033318.10408-2-trevor.wu@mediatek.com
Signed-off-by: Mark Brown <broonie@kernel.org>
sound/soc/mediatek/mt8188/mt8188-afe-clk.c
sound/soc/mediatek/mt8188/mt8188-afe-clk.h
sound/soc/mediatek/mt8188/mt8188-afe-pcm.c
sound/soc/mediatek/mt8188/mt8188-audsys-clk.c
sound/soc/mediatek/mt8188/mt8188-audsys-clk.h