iommu/mediatek: fix use-after-free on probe deferral

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commit de83d4617f upstream.

The driver is dropping the references taken to the larb devices during
probe after successful lookup as well as on errors. This can
potentially lead to a use-after-free in case a larb device has not yet
been bound to its driver so that the iommu driver probe defers.

Fix this by keeping the references as expected while the iommu driver is
bound.

Fixes: 2659392856 ("iommu/mediatek: Add error path for loop of mm_dts_parse")
Cc: stable@vger.kernel.org
Cc: Yong Wu <yong.wu@mediatek.com>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Yong Wu <yong.wu@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Johan Hovold 2025-10-20 06:53:10 +02:00 • committed by Greg Kroah-Hartman

parent 34cd26b1d8

commit 1ef70a0b10

1 changed files with 18 additions and 7 deletions

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drivers/iommu/mtk_iommu.c

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