WSL2-Linux-Kernel/include
Alexey Kardashevskiy c8b186a8d5 tracepoint: Fix race between tracing and removing tracepoint
When executing a tracepoint, the tracepoint's func is dereferenced twice -
in __DO_TRACE() (where the returned pointer is checked) and later on in
__traceiter_##_name where the returned pointer is dereferenced without
checking which leads to races against tracepoint_removal_sync() and
crashes.

This adds a check before referencing the pointer in tracepoint_ptr_deref.

Link: https://lkml.kernel.org/r/20210202072326.120557-1-aik@ozlabs.ru

Cc: stable@vger.kernel.org
Fixes: d25e37d89d ("tracepoint: Optimize using static_call()")
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2021-02-02 09:32:02 -05:00
..
acpi
asm-generic arm64: make atomic helpers __always_inline 2021-01-13 15:09:06 +00:00
clocksource
crypto
drm
dt-bindings
keys
kunit
kvm
linux tracepoint: Fix race between tracing and removing tracepoint 2021-02-02 09:32:02 -05:00
math-emu
media
memory
misc
net tcp: fix TCP socket rehash stats mis-accounting 2021-01-19 19:47:20 -08:00
pcmcia
ras
rdma
scsi
soc
sound
target
trace for-linus-2021-01-24 2021-01-24 09:35:28 -08:00
uapi block-5.11-2021-01-10 2021-01-10 12:53:08 -08:00
vdso
video
xen xen: Fix event channel callback via INTX/GSI 2021-01-13 16:12:00 +01:00