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 --- tools/perf/util/sample-raw.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 tools/perf/util/sample-raw.c (limited to 'tools/perf/util/sample-raw.c') diff --git a/tools/perf/util/sample-raw.c b/tools/perf/util/sample-raw.c new file mode 100644 index 000000000..f5ae9f468 --- /dev/null +++ b/tools/perf/util/sample-raw.c @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#include "sample-raw.h" + +#include +#include + +#include "env.h" +#include "evlist.h" +#include "header.h" +#include "session.h" + +/* + * Check platform the perf data file was created on and perform platform + * specific interpretation. + */ +void evlist__init_trace_event_sample_raw(struct evlist *evlist, struct perf_env *env) +{ + uint16_t e_machine = perf_env__e_machine(env, /*e_flags=*/NULL); + + if (e_machine == EM_S390) { + evlist__set_trace_event_sample_raw(evlist, evlist__s390_sample_raw); + } else if (e_machine == EM_X86_64 || e_machine == EM_386) { + const char *cpuid = perf_env__cpuid(env); + + if (cpuid && strstarts(cpuid, "AuthenticAMD") && evlist__has_amd_ibs(evlist)) + evlist__set_trace_event_sample_raw(evlist, evlist__amd_sample_raw); + } +} -- cgit v1.3.1