diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c index 865b0dae38d1..99780b654e8c 100644 --- a/kernel/bpf/helpers.c +++ b/kernel/bpf/helpers.c @@ -774,9 +774,11 @@ int bpf_try_get_buffers(struct bpf_bprintf_buffers **bufs) { int nest_level; + preempt_disable(); nest_level = this_cpu_inc_return(bpf_bprintf_nest_level); if (WARN_ON_ONCE(nest_level > MAX_BPRINTF_NEST_LEVEL)) { this_cpu_dec(bpf_bprintf_nest_level); + preempt_enable(); return -EBUSY; } *bufs = this_cpu_ptr(&bpf_bprintf_bufs[nest_level - 1]); @@ -786,9 +788,12 @@ int bpf_try_get_buffers(struct bpf_bprintf_buffers **bufs) void bpf_put_buffers(void) { - if (WARN_ON_ONCE(this_cpu_read(bpf_bprintf_nest_level) == 0)) + if (WARN_ON_ONCE(this_cpu_read(bpf_bprintf_nest_level) == 0)) { + preempt_enable(); return; + } this_cpu_dec(bpf_bprintf_nest_level); + preempt_enable(); } void bpf_bprintf_cleanup(struct bpf_bprintf_data *data)