From: Shivank Garg <shivankg@amd.com>
To: Vinod Koul <vkoul@kernel.org>, Frank Li <Frank.Li@kernel.org>,
"Logan Gunthorpe" <logang@deltatee.com>,
Andrew Morton <akpm@linux-foundation.org>
Cc: <stable@vger.kernel.org>, <dmaengine@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, Shivank Garg <shivankg@amd.com>,
Sashiko <sashiko-bot@kernel.org>
Subject: [PATCH v3 0/3] dmaengine: fix kref underflow and UAF in dma_chan_put()
Date: Sun, 16 Aug 2026 15:49:24 +0000 [thread overview]
Message-ID: <20260816-dmaengine-kref-fix-v3-0-7e76187145df@amd.com> (raw)
Fix bugs related to dma_chan_put(), found while testing with SDXI[1].
[1]: https://lore.kernel.org/dmaengine/20260605-sdxi-base-v3-0-4d38ca2bdffe@amd.com
Signed-off-by: Shivank Garg <shivankg@amd.com>
---
Changes in v3:
- Add patch 3: add synchronize_rcu() to wait for RCU readers to prevent
use-after-free. (Sashiko)
- Link to v2: https://lore.kernel.org/r/20260526-dmaengine-kref-fix-v2-0-3df60afac01d@amd.com
Changes in v2:
- Add patch 2 fixing the dma_chan_put()/dma_release_channel() use-after-free (sashiko)
- Link to v1: https://lore.kernel.org/r/20260518-dmaengine-kref-fix-v1-1-4d6125048fb7@amd.com
---
Shivank Garg (3):
dmaengine: Fix device kref underflow in dma_chan_put()
dmaengine: fix use-after-free in dma_chan_put() and dma_release_channel()
dmaengine: wait for RCU readers before releasing dma_device
drivers/dma/dmaengine.c | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)
---
base-commit: 0d995da5fb97e8c312834575604d4423eb6225b7
change-id: 20260518-dmaengine-kref-fix-7b21acb09455
Best regards,
--
Shivank Garg <shivankg@amd.com>
next reply other threads:[~2026-08-16 15:49 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-16 15:49 Shivank Garg [this message]
2026-08-16 15:49 ` [PATCH v3 1/3] dmaengine: Fix device kref underflow in dma_chan_put() Shivank Garg
2026-08-16 16:02 ` sashiko-bot
2026-08-16 18:14 ` Garg, Shivank
2026-08-16 15:49 ` [PATCH v3 2/3] dmaengine: fix use-after-free in dma_chan_put() and dma_release_channel() Shivank Garg
2026-08-16 16:07 ` sashiko-bot
2026-08-16 18:05 ` Garg, Shivank
2026-08-16 15:49 ` [PATCH v3 3/3] dmaengine: wait for RCU readers before releasing dma_device Shivank Garg
2026-08-16 16:10 ` sashiko-bot
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