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516001d53e
linux/kernel/trace
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Donggeun Yoo 516001d53e tracing: Free histogram the var ref when its initialization fails 
create_var_ref() allocates a VAR_REF hist_field and then calls
init_var_ref() to fill it in. When that fails the field is leaked.

commit 656fe2ba85 ("tracing: Use hist trigger's var_ref array to destroy
var_refs") made destroy_hist_field() return early for
HIST_FIELD_FL_VAR_REF, since var refs are freed by walking the trigger's
var_refs[] array instead. create_var_ref() adds the field to that array
only after init_var_ref() has succeeded, so on this path the field is in
neither place and nothing frees it. The call was correct when it was
written, before var refs were taken out of destroy_hist_field().

init_var_ref() cannot free it either. The caller owns the field, so
init_var_ref() undoes only its own string allocations and leaves the
field alone. Freeing it there would leave create_var_ref() passing freed
memory to destroy_hist_field(), which reads its flags.

Call __destroy_hist_field(), which frees the field without consulting
the flag.

Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260906133352.3815019-1-donggeunyoo.kernel@gmail.com
Fixes: 656fe2ba85 ("tracing: Use hist trigger's var_ref array to destroy var_refs")
Signed-off-by: Donggeun Yoo <donggeunyoo.kernel@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2026-09-11 13:46:34 -04:00
..
rv rv: Fix 32-bit build of nomiss KUnit test 2026-08-04 16:11:27 +02:00
blktrace.c block-7.0-20260305 2026-03-06 08:36:18 -08:00
bpf_trace.c bpf: Make bpf_trampoline_multi_detach return void 2026-08-13 02:52:23 +02:00
bpf_trace.h tracing/treewide: Remove second parameter of __assign_str() 2024-05-22 20:14:47 -04:00
error_report-traces.c
fgraph.c fgraph: Remove unused FGRAPH_MAX_INDEX 2026-09-11 13:37:50 -04:00
fprobe.c treewide: refresh kmalloc_obj() conversions 2026-09-04 21:37:00 -07:00
ftrace_internal.h function_graph: Make fgraph_update_pid_func() a stub for !DYNAMIC_FTRACE 2024-06-10 18:08:23 -04:00
ftrace.c ftrace: Synchronize the initialization of ftrace_ops 2026-09-02 11:08:21 -04:00
Kconfig tracing/probes: Support dumping fetcharg program for debugging dynamic events 2026-07-02 21:12:40 +09:00
kprobe_event_gen_test.c
Makefile tracing: Updates for v7.2: 2026-06-18 20:53:00 -07:00
pid_list.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
pid_list.h trace/pid_list: optimize pid_list->lock contention 2025-11-13 15:15:54 -05:00
power-traces.c PM: cpufreq: powernv/tracing: Move powernv_throttle trace event 2025-07-21 16:40:56 -04:00
preemptirq_delay_test.c tracing: Reject invalid preemptirq_delay_test CPU affinity 2026-07-28 07:18:50 -04:00
remote_test_events.h tracing: Add a trace remote module for testing 2026-03-09 12:33:55 -04:00
remote_test.c tracing: Fix desc in error path for the trace remote test module 2026-05-16 16:11:04 -04:00
rethook.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
ring_buffer_benchmark.c tracing: Fix subbuf resize races with trace_pipe_raw readers 2026-09-04 16:19:07 -04:00
ring_buffer.c tracing fixes for v7.3: 2026-09-06 14:21:24 -07:00
rpm-traces.c
simple_ring_buffer.c tracing: Fix retry exhaustion in simple ring buffer reader swap 2026-08-27 21:31:41 -04:00
synth_event_gen_test.c tracing / synthetic: Disable events after testing in synth_event_gen_test_init() 2023-12-21 10:04:45 -05:00
trace_benchmark.c tracing: Improve benchmark test performance by using do_div() 2024-05-13 20:00:57 -04:00
trace_benchmark.h
trace_boot.c tracing/boot: Add support for eprobe, fprobe, and tprobe events 2026-08-08 21:20:55 +09:00
trace_branch.c tracing/branch: Use pr_warn() instead of printk(KERN_WARNING) 2026-05-21 18:03:08 -04:00
trace_btf.c tracing/probes: Fix BTF kflag check for anonymous struct member access 2026-09-03 09:04:25 +09:00
trace_btf.h tracing/probes: Fix BTF kflag check for anonymous struct member access 2026-09-03 09:04:25 +09:00
trace_clock.c tracing: Use atomic64_inc_return() in trace_clock_counter() 2024-10-09 19:59:49 -04:00
trace_dynevent.c tracing/boot: Add support for eprobe, fprobe, and tprobe events 2026-08-08 21:20:55 +09:00
trace_dynevent.h tracing: probes: Fix a possible race in trace_probe_log APIs 2025-05-13 22:23:34 +09:00
trace_entries.h tracing: Fix ftrace event field alignments 2026-02-05 09:47:11 -05:00
trace_eprobe.c treewide: refresh kmalloc_obj() conversions 2026-09-04 21:37:00 -07:00
trace_event_perf.c perf/ftrace: Fix WARNING in __unregister_ftrace_function 2026-05-29 11:27:40 -04:00
trace_events_filter_test.h
trace_events_filter.c tracing/filters: Fix false positive match in regex_match_full() 2026-07-29 14:32:11 -04:00
trace_events_hist.c tracing: Free histogram the var ref when its initialization fails 2026-09-11 13:46:34 -04:00
trace_events_inject.c tracing: Have format file honor EVENT_FILE_FL_FREED 2024-08-07 18:12:46 -04:00
trace_events_synth.c tracing/synthetic: Free type string on error path 2026-07-07 13:59:55 -04:00
trace_events_trigger.c tracing: Cleanup event_enable_trigger_parse() by using __free() 2026-08-11 10:23:38 -04:00
trace_events_user.c tracing/user_events: Don't destroy fields when event removal fails 2026-09-11 13:30:15 -04:00
trace_events.c tracing: Have show_event_filters/triggers files take trace array ref 2026-09-01 16:36:52 -04:00
trace_export.c tracing: Fix ftrace event field alignments 2026-02-05 09:47:11 -05:00
trace_fprobe.c Probes updates for v7.3: 2026-08-20 15:11:52 -07:00
trace_functions_graph.c function_graph: Use the saved entry's size when reprinting it 2026-09-11 13:39:08 -04:00
trace_functions.c ftrace: Take trace_array reference before accessing its ftrace_ops 2026-09-01 16:38:19 -04:00
trace_hwlat.c tracing: Fix false sharing in hwlat get_sample() 2026-02-10 03:36:39 -05:00
trace_irqsoff.c tracing: Allow tracer to add more than 32 options 2025-11-04 21:44:00 +09:00
trace_kdb.c tracing: Allow tracer to add more than 32 options 2025-11-04 21:44:00 +09:00
trace_kprobe_selftest.c tracing: arm64: Avoid missing-prototype warnings 2023-07-12 12:06:04 -04:00
trace_kprobe_selftest.h
trace_kprobe.c tracing/probes: Treating longer symbol name on event comparation 2026-07-28 23:55:35 +09:00
trace_mmiotrace.c tracing updates for v7.3: 2026-08-19 14:06:14 -07:00
trace_nop.c
trace_osnoise.c tracing/osnoise: Call synchronize_rcu() when unregistering 2026-07-06 14:56:18 -04:00
trace_output.c tracing updates for v7.1: 2026-04-17 09:43:12 -07:00
trace_output.h tracing: Allow tracer to add more than 32 options 2025-11-04 21:44:00 +09:00
trace_pid.c tracing: Move pid filtering into trace_pid.c 2026-02-08 21:01:13 -05:00
trace_preemptirq.c tracing: Add a no-rcu-check version of trace_##event##_enabled() 2026-07-07 10:42:29 -04:00
trace_printk.c kernel/trace/trace_printk: Use kstrdup() instead of kmalloc() and strcpy() 2026-07-28 07:18:48 -04:00
trace_probe_kernel.h tracing/probes: Fix extra whitespace in trace_probe_kernel.h 2026-07-21 18:00:13 +09:00
trace_probe_tmpl.h tracing/probes: Add this_cpu_read() and this_cpu_ptr() dereference method to fetcharg 2026-07-14 22:43:16 +09:00
trace_probe.c tracing/probes: Fix use-after-free on field name/type of events with multiple probes 2026-09-03 09:04:25 +09:00
trace_probe.h tracing/probes: Fix use-after-free on field name/type of events with multiple probes 2026-09-03 09:04:25 +09:00
trace_recursion_record.c tracing: Switch trace_recursion_record.c code over to use guard() 2026-05-21 18:03:07 -04:00
trace_remote.c treewide: refresh kmalloc_obj() conversions 2026-09-04 21:37:00 -07:00
trace_sched_switch.c tracing: Use strscpy() instead of strcpy() in trace_sched_switch 2026-07-28 07:18:50 -04:00
trace_sched_wakeup.c tracing: Allow tracer to add more than 32 options 2025-11-04 21:44:00 +09:00
trace_selftest_dynamic.c
trace_selftest.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
trace_seq.c tracing: Add bitmask-list option for human-readable bitmask display 2026-01-26 17:00:50 -05:00
trace_snapshot.c tracing: Remove duplicate latency_fsnotify() stub 2026-03-31 14:58:39 -04:00
trace_stack.c ftrace: Take trace_array reference before accessing its ftrace_ops 2026-09-01 16:38:19 -04:00
trace_stat.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
trace_stat.h
trace_synth.h
trace_syscalls.c tracing: Make per-template BTF id lists file-local 2026-08-05 22:02:29 -04:00
trace_uprobe.c uprobes: guard trace cleanup against error pointers 2026-09-01 09:50:11 +09:00
trace.c tracing: Fix comment in tracing_buffers_splice_read() 2026-09-04 16:19:29 -04:00
trace.h tracing: Fix subbuf resize races with trace_pipe_raw readers 2026-09-04 16:19:07 -04:00
tracing_map.c tracing: Simplify pages allocation for tracing_map logic 2026-05-21 18:12:10 -04:00
tracing_map.h tracing: Simplify pages allocation for tracing_map logic 2026-05-21 18:12:10 -04:00
undefsyms_base.c tracing: Make undefsyms_base.c a first-class citizen 2026-04-22 11:24:41 -04:00