From e873c74132f0c5f1452816cd9bb26208f0bba1e1 Mon Sep 17 00:00:00 2001
From: Shivank Garg <shivankg@amd.com>
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 <sashiko-bot@kernel.org>
Link: https://sashiko.dev/#/patchset/20260518-dmaengine-kref-fix-v1-1-4d6125048fb7@amd.com
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Shivank Garg <shivankg@amd.com>
Link: https://patch.msgid.link/20260822-dmaengine-kref-fix-v5-3-d4a4ee47d927@amd.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
---
 tools/perf/Build | 106 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 tools/perf/Build

(limited to 'tools/perf/Build')

diff --git a/tools/perf/Build b/tools/perf/Build
new file mode 100644
index 000000000..e18c80a5c
--- /dev/null
+++ b/tools/perf/Build
@@ -0,0 +1,106 @@
+perf-bench-y += builtin-bench.o
+perf-y += builtin-annotate.o
+perf-y += builtin-check.o
+perf-y += builtin-config.o
+perf-y += builtin-diff.o
+perf-y += builtin-evlist.o
+perf-y += builtin-ftrace.o
+perf-y += builtin-help.o
+perf-y += builtin-buildid-list.o
+perf-y += builtin-buildid-cache.o
+perf-y += builtin-kallsyms.o
+perf-y += builtin-list.o
+perf-y += builtin-record.o
+perf-y += builtin-report.o
+perf-y += builtin-stat.o
+perf-y += builtin-top.o
+perf-y += builtin-script.o
+perf-y += builtin-kvm.o
+perf-y += builtin-inject.o
+perf-y += builtin-mem.o
+perf-y += builtin-data.o
+perf-y += builtin-version.o
+perf-y += builtin-c2c.o
+perf-y += builtin-daemon.o
+
+perf-$(CONFIG_LIBTRACEEVENT) += builtin-kmem.o
+perf-$(CONFIG_LIBTRACEEVENT) += builtin-kwork.o
+perf-$(CONFIG_LIBTRACEEVENT) += builtin-lock.o
+perf-$(CONFIG_LIBTRACEEVENT) += builtin-sched.o
+perf-$(CONFIG_LIBTRACEEVENT) += builtin-timechart.o
+
+ifeq ($(CONFIG_LIBTRACEEVENT),y)
+  perf-$(CONFIG_TRACE) += builtin-trace.o
+  perf-$(CONFIG_TRACE) += trace/beauty/
+endif
+
+perf-util-y += trace/beauty/
+
+perf-$(CONFIG_LIBELF) += builtin-probe.o
+
+perf-bench-y += bench/
+perf-test-y += tests/
+
+perf-y += perf.o
+
+paths += -DPERF_HTML_PATH="BUILD_STR($(htmldir_SQ))"
+paths += -DPERF_INFO_PATH="BUILD_STR($(infodir_SQ))"
+paths += -DPERF_MAN_PATH="BUILD_STR($(mandir_SQ))"
+
+CFLAGS_builtin-help.o      += $(paths)
+CFLAGS_builtin-timechart.o += $(paths)
+CFLAGS_perf.o              += -DPERF_HTML_PATH="BUILD_STR($(htmldir_SQ))"	\
+			      -DPERF_EXEC_PATH="BUILD_STR($(perfexecdir_SQ))"	\
+			      -DPREFIX="BUILD_STR($(prefix_SQ))"
+CFLAGS_builtin-trace.o	   += -DSTRACE_GROUPS_DIR="BUILD_STR($(STRACE_GROUPS_DIR_SQ))"
+CFLAGS_builtin-report.o	   += -DTIPDIR="BUILD_STR($(tipdir_SQ))"
+CFLAGS_builtin-report.o	   += -DDOCDIR="BUILD_STR($(srcdir_SQ)/Documentation)"
+
+perf-util-y += util/
+perf-util-y += arch/
+perf-y += arch/
+perf-test-y += arch/
+perf-ui-y += ui/
+perf-util-y += scripts/
+
+gtk-y += ui/gtk/
+
+ifdef SHELLCHECK
+  SHELL_TESTS := $(wildcard *.sh)
+  SHELL_TEST_LOGS := $(SHELL_TESTS:%=%.shellcheck_log)
+else
+  SHELL_TESTS :=
+  SHELL_TEST_LOGS :=
+endif
+
+$(OUTPUT)%.shellcheck_log: %
+	$(call rule_mkdir)
+	$(Q)$(call echo-cmd,test)$(SHELLCHECK) "$<" > $@ || (cat $@ && rm $@ && false)
+
+perf-y += $(SHELL_TEST_LOGS)
+
+ifdef MYPY
+  PY_TESTS := $(shell find python -type f -name '*.py')
+  MYPY_TEST_LOGS := $(PY_TESTS:python/%=python/%.mypy_log)
+else
+  MYPY_TEST_LOGS :=
+endif
+
+$(OUTPUT)%.mypy_log: %
+	$(call rule_mkdir)
+	$(Q)$(call echo-cmd,test)mypy "$<" > $@ || (cat $@ && rm $@ && false)
+
+perf-y += $(MYPY_TEST_LOGS)
+
+ifdef PYLINT
+  PY_TESTS := $(shell find python -type f -name '*.py')
+  PYLINT_TEST_LOGS := $(PY_TESTS:python/%=python/%.pylint_log)
+else
+  PYLINT_TEST_LOGS :=
+endif
+
+$(OUTPUT)%.pylint_log: %
+	$(call rule_mkdir)
+	$(Q)$(call echo-cmd,test)pylint "$<" > $@ || (cat $@ && rm $@ && false)
+
+perf-y += $(PYLINT_TEST_LOGS)
-- 
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