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Sheetal be655c3736 dmaengine: tegra-adma: Fix use-after-free 
[ Upstream commit 2efd07a7c3 ]

A use-after-free bug exists in the Tegra ADMA driver when audio streams
are terminated, particularly during XRUN conditions. The issue occurs
when the DMA buffer is freed by tegra_adma_terminate_all() before the
vchan completion tasklet finishes accessing it.

The race condition follows this sequence:

  1. DMA transfer completes, triggering an interrupt that schedules the
     completion tasklet (tasklet has not executed yet)
  2. Audio playback stops, calling tegra_adma_terminate_all() which
     frees the DMA buffer memory via kfree()
  3. The scheduled tasklet finally executes, calling vchan_complete()
     which attempts to access the already-freed memory

Since tasklets can execute at any time after being scheduled, there is
no guarantee that the buffer will remain valid when vchan_complete()
runs.

Fix this by properly synchronizing the virtual channel completion:
 - Calling vchan_terminate_vdesc() in tegra_adma_stop() to mark the
   descriptors as terminated instead of freeing the descriptor.
 - Add the callback tegra_adma_synchronize() that calls
   vchan_synchronize() which kills any pending tasklets and frees any
   terminated descriptors.

Crash logs:
[  337.427523] BUG: KASAN: use-after-free in vchan_complete+0x124/0x3b0
[  337.427544] Read of size 8 at addr ffff000132055428 by task swapper/0/0

[  337.427562] Call trace:
[  337.427564]  dump_backtrace+0x0/0x320
[  337.427571]  show_stack+0x20/0x30
[  337.427575]  dump_stack_lvl+0x68/0x84
[  337.427584]  print_address_description.constprop.0+0x74/0x2b8
[  337.427590]  kasan_report+0x1f4/0x210
[  337.427598]  __asan_load8+0xa0/0xd0
[  337.427603]  vchan_complete+0x124/0x3b0
[  337.427609]  tasklet_action_common.constprop.0+0x190/0x1d0
[  337.427617]  tasklet_action+0x30/0x40
[  337.427623]  __do_softirq+0x1a0/0x5c4
[  337.427628]  irq_exit+0x110/0x140
[  337.427633]  handle_domain_irq+0xa4/0xe0
[  337.427640]  gic_handle_irq+0x64/0x160
[  337.427644]  call_on_irq_stack+0x20/0x4c
[  337.427649]  do_interrupt_handler+0x7c/0x90
[  337.427654]  el1_interrupt+0x30/0x80
[  337.427659]  el1h_64_irq_handler+0x18/0x30
[  337.427663]  el1h_64_irq+0x7c/0x80
[  337.427667]  cpuidle_enter_state+0xe4/0x540
[  337.427674]  cpuidle_enter+0x54/0x80
[  337.427679]  do_idle+0x2e0/0x380
[  337.427685]  cpu_startup_entry+0x2c/0x70
[  337.427690]  rest_init+0x114/0x130
[  337.427695]  arch_call_rest_init+0x18/0x24
[  337.427702]  start_kernel+0x380/0x3b4
[  337.427706]  __primary_switched+0xc0/0xc8

Fixes: f46b195799 ("dmaengine: tegra-adma: Add support for Tegra210 ADMA")
Signed-off-by: Sheetal <sheetal@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://patch.msgid.link/20251110142445.3842036-1-sheetal@nvidia.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-01-23 11:21:21 +01:00
arch mips: fix HIGHMEM initialization 2026-01-23 11:21:20 +01:00
block block: zero non-PI portion of auto integrity buffer 2026-01-23 11:21:16 +01:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: seqiv - Do not use req->iv after crypto_aead_encrypt 2026-01-08 10:16:43 +01:00
Documentation dt-bindings: PCI: qcom,pcie-sm8550: Add missing required power-domains and resets 2026-01-02 12:57:27 +01:00
drivers dmaengine: tegra-adma: Fix use-after-free 2026-01-23 11:21:21 +01:00
fs NFS: Fix size read races in truncate, fallocate and copy offload 2026-01-23 11:21:20 +01:00
include mm, kfence: describe @slab parameter in __kfence_obj_info() 2026-01-23 11:21:20 +01:00
init printk changes for 6.18 2025-10-04 11:13:11 -07:00
io_uring io_uring: move local task_work in exit cancel loop 2026-01-23 11:21:13 +01:00
ipc namespace-6.18-rc1 2025-09-29 11:20:29 -07:00
kernel trace: ftrace_dump_on_oops[] is not exported, make it static 2026-01-17 16:35:29 +01:00
lib lib/crypto: aes: Fix missing MMU protection for AES S-box 2026-01-17 16:35:12 +01:00
LICENSES LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2 2025-07-24 11:15:39 +02:00
mm mm/damon/tests/core-kunit: handle alloc failures on damon_test_split_regions_of() 2026-01-08 10:17:21 +01:00
net net/sched: sch_qfq: do not free existing class in qfq_change_class() 2026-01-23 11:21:18 +01:00
rust rust: bitops: fix missing _find_* functions on 32-bit ARM 2026-01-23 11:21:12 +01:00
samples samples/ftrace: Adjust LoongArch register restore order in direct calls 2026-01-08 10:17:11 +01:00
scripts mcb: Add missing modpost build support 2026-01-08 10:16:47 +01:00
security kernel/kexec: change the prototype of kimage_map_segment() 2026-01-08 10:17:10 +01:00
sound ASoC: tlv320adcx140: fix word length 2026-01-23 11:21:19 +01:00
tools selftests: drv-net: fix RPS mask handling for high CPU numbers 2026-01-23 11:21:18 +01:00
usr gen_init_cpio: Ignore fsync() returning EINVAL on pipes 2025-10-07 09:53:05 -07:00
virt KVM: Fix last_boosted_vcpu index assignment bug 2026-01-02 12:57:21 +01:00
.clang-format memblock: drop for_each_free_mem_pfn_range_in_zone_from() 2025-09-14 08:49:03 +03:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-07 00:11:47 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: remove Alyssa Rosenzweig 2025-09-18 21:17:31 +02:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore .gitignore: ignore compile_commands.json globally 2025-08-12 15:53:55 -07:00
.mailmap 8 hotfixes. 4 are cc:stable, 7 are against mm/. 2025-11-26 12:38:05 -08:00
.pylintrc tools: docs: parse-headers.py: move it from sphinx dir 2025-08-29 15:54:42 -06:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: mark ISDN subsystem as orphan 2025-10-27 17:49:45 -07:00
Kbuild sched: Make migrate_{en,dis}able() inline 2025-09-25 09:57:16 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS soc: fixes for 6.18, part 4 2025-11-28 09:57:31 -08:00
Makefile Linux 6.18.6 2026-01-17 16:35:34 +01:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.