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/crypto/api-kpp.rst | 41 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 Documentation/crypto/api-kpp.rst (limited to 'Documentation/crypto/api-kpp.rst') diff --git a/Documentation/crypto/api-kpp.rst b/Documentation/crypto/api-kpp.rst new file mode 100644 index 000000000..5794e2d10 --- /dev/null +++ b/Documentation/crypto/api-kpp.rst @@ -0,0 +1,41 @@ +Key-agreement Protocol Primitives (KPP) +======================================= + +Key-agreement Protocol Primitives (KPP) Cipher Algorithm Definitions +-------------------------------------------------------------------- + +.. kernel-doc:: include/crypto/kpp.h + :functions: kpp_request crypto_kpp kpp_alg kpp_secret + +Key-agreement Protocol Primitives (KPP) Cipher API +-------------------------------------------------- + +.. kernel-doc:: include/crypto/kpp.h + :doc: Generic Key-agreement Protocol Primitives API + +.. kernel-doc:: include/crypto/kpp.h + :functions: crypto_alloc_kpp crypto_free_kpp crypto_kpp_set_secret crypto_kpp_generate_public_key crypto_kpp_compute_shared_secret crypto_kpp_maxsize + +Key-agreement Protocol Primitives (KPP) Cipher Request Handle +------------------------------------------------------------- + +.. kernel-doc:: include/crypto/kpp.h + :functions: kpp_request_alloc kpp_request_free kpp_request_set_callback kpp_request_set_input kpp_request_set_output + +ECDH Helper Functions +--------------------- + +.. kernel-doc:: include/crypto/ecdh.h + :doc: ECDH Helper Functions + +.. kernel-doc:: include/crypto/ecdh.h + :functions: ecdh crypto_ecdh_key_len crypto_ecdh_encode_key crypto_ecdh_decode_key + +DH Helper Functions +------------------- + +.. kernel-doc:: include/crypto/dh.h + :doc: DH Helper Functions + +.. kernel-doc:: include/crypto/dh.h + :functions: dh crypto_dh_key_len crypto_dh_encode_key crypto_dh_decode_key -- cgit v1.3.1