From e873c74132f0c5f1452816cd9bb26208f0bba1e1 Mon Sep 17 00:00:00 2001 From: Shivank Garg Date: Sat, 22 Aug 2026 19:22:05 +0000 Subject: dmaengine: fix use-after-free in dma_chan_put() and dma_release_channel() When dma_device_put() drops the last reference on chan->device->ref, dma_device_release() runs and may free the dma_device along with its channels. dma_chan_put() then still reads chan->device->owner via dma_chan_to_owner() for the trailing module_put(). KASAN catches it: slab-use-after-free in dma_chan_put+0x3e6/0x4c0 Read of size 8 by task insmod/6319 Freed by task 6319: kfree+0x225/0x470 dma_chan_put+0x395/0x4c0 dmaengine_put+0xf8/0x160 Cache the module owner in dma_chan_put() before the put so the trailing module_put() does not need chan->device. Fixes: 8ad342a86359 ("dmaengine: Add reference counting to dma_device struct") Suggested-by: Sashiko Link: https://sashiko.dev/#/patchset/20260518-dmaengine-kref-fix-v1-1-4d6125048fb7@amd.com Reviewed-by: Frank Li Reviewed-by: Logan Gunthorpe Signed-off-by: Shivank Garg Link: https://patch.msgid.link/20260822-dmaengine-kref-fix-v5-3-d4a4ee47d927@amd.com Signed-off-by: Vinod Koul --- Documentation/dev-tools/index.rst | 42 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 Documentation/dev-tools/index.rst (limited to 'Documentation/dev-tools/index.rst') diff --git a/Documentation/dev-tools/index.rst b/Documentation/dev-tools/index.rst new file mode 100644 index 000000000..59cbb77b3 --- /dev/null +++ b/Documentation/dev-tools/index.rst @@ -0,0 +1,42 @@ +================================ +Development tools for the kernel +================================ + +This document is a collection of documents about development tools that can +be used to work on the kernel. For now, the documents have been pulled +together without any significant effort to integrate them into a coherent +whole; patches welcome! + +A brief overview of testing-specific tools can be found in +Documentation/dev-tools/testing-overview.rst + +Tools that are specific to debugging can be found in +Documentation/process/debugging/index.rst + +.. toctree:: + :caption: Table of contents + :maxdepth: 2 + + testing-overview + checkpatch + clang-format + coccinelle + context-analysis + sparse + kcov + gcov + kasan + kmsan + ubsan + kmemleak + kcsan + lkmm/index + kfence + kselftest + kunit/index + ktap + checkuapi + gpio-sloppy-logic-analyzer + autofdo + propeller + container -- cgit v1.3.1