Masami Hiramatsu (Google) bae4d6a2dd tracing/kprobes: Check whether get_kretprobe() returns NULL in kretprobe_dispatcher() ... commit cc72b72073 upstream. There is a small chance that get_kretprobe(ri) returns NULL in kretprobe_dispatcher() when another CPU unregisters the kretprobe right after __kretprobe_trampoline_handler(). To avoid this issue, kretprobe_dispatcher() checks the get_kretprobe() return value again. And if it is NULL, it returns soon because that kretprobe is under unregistering process. This issue has been introduced when the kretprobe is decoupled from the struct kretprobe_instance by commit d741bf41d7 ("kprobes: Remove kretprobe hash"). Before that commit, the struct kretprob_instance::rp directly points the kretprobe and it is never be NULL. Link: https://lkml.kernel.org/r/165366693881.797669.16926184644089588731.stgit@devnote2 Reported-by: Yonghong Song <yhs@fb.com> Fixes: d741bf41d7 ("kprobes: Remove kretprobe hash") Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: bpf <bpf@vger.kernel.org> Cc: Kernel Team <kernel-team@fb.com> Cc: stable@vger.kernel.org Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Acked-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-06-29 09:03:20 +02:00
..
Kconfig	tracing: Simplify the Kconfig dependency of FTRACE	2021-08-16 11:37:20 -04:00
Makefile	tracing: Add a probe that attaches to trace events	2021-08-20 14:18:40 -04:00
blktrace.c	blktrace: fix use after free for struct blk_trace	2022-03-08 19:12:43 +01:00
bpf_trace.c	bpf: Add MEM_RDONLY for helper args that are pointers to rdonly mem.	2022-05-01 17:22:26 +02:00
bpf_trace.h	bpf: Use dedicated bpf_trace_printk event instead of trace_printk()	2020-07-13 16:55:49 -07:00
error_report-traces.c	tracing: add error_report_end trace point	2021-02-26 09:41:02 -08:00
fgraph.c	tracing: Fix various typos in comments	2021-03-23 14:08:18 -04:00
ftrace.c	ftrace: Clean up hash direct_functions on register failures	2022-06-09 10:23:27 +02:00
ftrace_internal.h	x86/ftrace: Have ftrace trampolines turn read-only at the end of system boot up	2020-05-12 18:24:34 -04:00
kprobe_event_gen_test.c	tracing: Add kprobe event command generation test module	2020-01-30 09:46:28 -05:00
power-traces.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
preemptirq_delay_test.c	kernel: trace: preemptirq_delay_test: add cpu affinity	2021-02-02 17:02:07 -05:00
ring_buffer.c	ring-buffer: Protect ring_buffer_reset() from reentrancy	2021-11-18 19:16:03 +01:00
ring_buffer_benchmark.c	sched,tracing: Convert to sched_set_fifo()	2020-07-29 11:43:53 +02:00
rpm-traces.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
synth_event_gen_test.c	tracing: Fix various typos in comments	2021-03-23 14:08:18 -04:00
trace.c	tracing: Avoid adding tracer option before update_tracer_options	2022-06-14 18:36:14 +02:00
trace.h	tracing: Fix pid filtering when triggers are attached	2021-12-01 09:04:43 +01:00
trace_benchmark.c	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00
trace_benchmark.h	tracing: Fix SPDX format headers to use C++ style comments	2018-08-16 19:08:06 -04:00
trace_boot.c	tracing: Initialize integer variable to prevent garbage return value	2022-06-09 10:23:21 +02:00
trace_branch.c	tracing: Merge irqflags + preempt counter.	2021-02-02 17:02:06 -05:00
trace_clock.c	tracing: Do no increment trace_clock_global() by one	2021-06-18 09:10:00 -04:00
trace_dynevent.c	tracing: Disable "other" permission bits in the tracefs files	2021-11-18 19:16:15 +01:00
trace_dynevent.h	tracing: Add DYNAMIC flag for dynamic events	2021-08-18 18:10:32 -04:00
trace_entries.h	trace: Add timerlat tracer	2021-06-25 19:57:24 -04:00
trace_eprobe.c	tracing: Fix misspelling of "missing"	2021-10-29 09:54:14 -04:00
trace_event_perf.c	ftrace: do CPU checking after preemption disabled	2021-11-18 19:16:20 +01:00
trace_events.c	tracing: Have type enum modifications copy the strings	2022-04-08 14:24:13 +02:00
trace_events_filter.c	tracing: Add ustring operation to filtering string pointers	2022-03-08 19:12:33 +01:00
trace_events_filter_test.h	tracing: Fix SPDX format headers to use C++ style comments	2018-08-16 19:08:06 -04:00
trace_events_hist.c	tracing: Fix potential double free in create_var_ref()	2022-06-09 10:23:20 +02:00
trace_events_inject.c	tracing: Merge irqflags + preempt counter.	2021-02-02 17:02:06 -05:00
trace_events_synth.c	tracing: Do not let synth_events block other dyn_event systems during create	2022-03-08 19:12:35 +01:00
trace_events_trigger.c	tracing: Have traceon and traceoff trigger honor the instance	2022-03-02 11:48:03 +01:00
trace_export.c	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00
trace_functions.c	tracing: Add "func_no_repeats" option for function tracing	2021-04-15 14:50:02 -04:00
trace_functions_graph.c	tracing: Disable "other" permission bits in the tracefs files	2021-11-18 19:16:15 +01:00
trace_hwlat.c	tracing: Disable "other" permission bits in the tracefs files	2021-11-18 19:16:15 +01:00
trace_irqsoff.c	tracing: Merge irqflags + preempt counter.	2021-02-02 17:02:06 -05:00
trace_kdb.c	kdb: Rename members of struct kdbtab_t	2021-07-27 17:05:06 +01:00
trace_kprobe.c	tracing/kprobes: Check whether get_kretprobe() returns NULL in kretprobe_dispatcher()	2022-06-29 09:03:20 +02:00
trace_kprobe_selftest.c	selftest/ftrace: Move kprobe selftest function to separate compile unit	2018-07-30 18:41:04 -04:00
trace_kprobe_selftest.h	tracing: Fix SPDX format headers to use C++ style comments	2018-08-16 19:08:06 -04:00
trace_mmiotrace.c	tracing: Remove definition of DEBUG in trace_mmiotrace.c	2021-02-02 17:02:07 -05:00
trace_nop.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
trace_osnoise.c	tracing/osnoise: Force quiescent states while tracing	2022-03-16 14:23:43 +01:00
trace_output.c	tracing: Add migrate-disabled counter to tracing output.	2021-09-03 19:42:35 -04:00
trace_output.h	ftrace: Add recording of functions that caused recursion	2020-11-06 08:42:26 -05:00
trace_preemptirq.c	lockdep: fix order in trace_hardirqs_off_caller()	2020-09-14 10:08:07 +02:00
trace_printk.c	tracing: Disable "other" permission bits in the tracefs files	2021-11-18 19:16:15 +01:00
trace_probe.c	tracing/probes: check the return value of kstrndup() for pbuf	2022-03-08 19:12:38 +01:00
trace_probe.h	tracing: Add a probe that attaches to trace events	2021-08-20 14:18:40 -04:00
trace_probe_tmpl.h	tracing/probes: Have process_fetch_insn() take a void * instead of pt_regs	2021-08-19 09:09:03 -04:00
trace_recursion_record.c	tracing: Disable "other" permission bits in the tracefs files	2021-11-18 19:16:15 +01:00
trace_sched_switch.c	tracing: Fix sched switch start/stop refcount racy updates	2020-01-30 09:46:10 -05:00
trace_sched_wakeup.c	tracing: Change variable type as bool for clean-up	2021-06-30 09:19:14 -04:00
trace_selftest.c	tracing: Fix various typos in comments	2021-03-23 14:08:18 -04:00
trace_selftest_dynamic.c	ftrace: Mark function tracer test functions noinline/noclone	2018-01-23 15:57:29 -05:00
trace_seq.c	tracing: Fix various typos in comments	2021-03-23 14:08:18 -04:00
trace_stack.c	tracing: Disable "other" permission bits in the tracefs files	2021-11-18 19:16:15 +01:00
trace_stat.c	tracing: Disable "other" permission bits in the tracefs files	2021-11-18 19:16:15 +01:00
trace_stat.h	tracing: Use generic type for comparator function	2019-11-14 13:15:11 -05:00
trace_synth.h	tracing: synth events: increase max fields count	2021-09-08 15:29:16 -04:00
trace_syscalls.c	tracing: Make tp_printk work on syscall tracepoints	2022-06-14 18:36:14 +02:00
trace_uprobe.c	tracing/uprobes: Check the return value of kstrdup() for tu->filename	2022-03-08 19:12:38 +01:00
tracing_map.c	tracing: Fix a kmemleak false positive in tracing_map	2021-12-17 10:30:16 +01:00
tracing_map.h	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00