From da9596955c05966768364ab1cad2f43fcddc6f06 Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Wed, 30 Oct 2024 14:02:53 +0000 Subject: [PATCH] nvmem: core: Check read_only flag for force_ro in bin_attr_nvmem_write() The bin_attr_nvmem_write() must check the read_only flag and block writes on read-only devices, now that a nvmem device can be switched between read-write and read-only mode at runtime using the force_ro attribute. Add the missing check. Fixes: 9d7eb234ac7a ("nvmem: core: Implement force_ro sysfs attribute") Cc: Stable@vger.kernel.org Signed-off-by: Marek Vasut Signed-off-by: Srinivas Kandagatla Link: https://lore.kernel.org/r/20241030140253.40445-2-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman --- drivers/nvmem/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index 66eec1960801..90c46f6e465d 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -267,7 +267,7 @@ static ssize_t bin_attr_nvmem_write(struct file *filp, struct kobject *kobj, count = round_down(count, nvmem->word_size); - if (!nvmem->reg_write) + if (!nvmem->reg_write || nvmem->read_only) return -EPERM; rc = nvmem_reg_write(nvmem, pos, buf, count); -- 2.20.1