6.12-stable review patch. If anyone has any objections, please let me know.
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From: Marek Vasut marex@denx.de
commit da9596955c05966768364ab1cad2f43fcddc6f06 upstream.
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 marex@denx.de Signed-off-by: Srinivas Kandagatla srinivas.kandagatla@linaro.org Link: https://lore.kernel.org/r/20241030140253.40445-2-srinivas.kandagatla@linaro.... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/nvmem/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -267,7 +267,7 @@ static ssize_t bin_attr_nvmem_write(stru
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);