From 506ada89629ec7059b96ecfb0dc7d33ece0103ca Mon Sep 17 00:00:00 2001 From: Eduard Zingerman Date: Fri, 4 Sep 2026 17:05:56 -0700 Subject: bpf: mark a NULL kfunc argument precise check_kfunc_arg() allows bpf_register_is_null() for nullable arguments w/o marking the underlying scalar register precise. Hence a checkpoint created on such a path would prune against arbitrary scalar value. Fixes: 3bda08b63670 ("bpf: Allow NULL buffers in bpf_dynptr_slice(_rw)") Signed-off-by: Eduard Zingerman Link: https://lore.kernel.org/r/20260904-register-is-null-precise-fixes-v1-5-0f5a360ff15d@gmail.com Signed-off-by: Alexei Starovoitov --- drivers/rtc/nvmem.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 drivers/rtc/nvmem.c (limited to 'drivers/rtc/nvmem.c') diff --git a/drivers/rtc/nvmem.c b/drivers/rtc/nvmem.c new file mode 100644 index 000000000..37df7e805 --- /dev/null +++ b/drivers/rtc/nvmem.c @@ -0,0 +1,31 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * RTC subsystem, nvmem interface + * + * Copyright (C) 2017 Alexandre Belloni + */ + +#include +#include +#include +#include + +int devm_rtc_nvmem_register(struct rtc_device *rtc, + struct nvmem_config *nvmem_config) +{ + struct device *dev = rtc->dev.parent; + struct nvmem_device *nvmem; + + if (!nvmem_config) + return -ENODEV; + + nvmem_config->dev = dev; + nvmem_config->owner = rtc->owner; + nvmem_config->add_legacy_fixed_of_cells = true; + nvmem = devm_nvmem_register(dev, nvmem_config); + if (IS_ERR(nvmem)) + dev_err(dev, "failed to register nvmem device for RTC\n"); + + return PTR_ERR_OR_ZERO(nvmem); +} +EXPORT_SYMBOL_GPL(devm_rtc_nvmem_register); -- cgit v1.3.1