The simple_write_to_buffer() function will return positive/success if it
is able to write a single byte anywhere within the buffer. However that
potentially leaves a lot of the buffer uninitialized.
In this code it's better to return 0 if the offset is non-zero. This
code is not written to support partial writes. And then return -EFAULT
if the buffer is not completely initialized.
Fixes: cfad6425382e ("eeprom: Add IDT 89HPESx EEPROM/CSR driver")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
v2: In v1, I tried to be fancy and use strndup_user(). That potentially
breaks the user space API. I cannot test this code so it's better to be
conservative.
drivers/misc/eeprom/idt_89hpesx.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/misc/eeprom/idt_89hpesx.c b/drivers/misc/eeprom/idt_89hpesx.c
index b0cff4b152da..7f430742ce2b 100644
--- a/drivers/misc/eeprom/idt_89hpesx.c
+++ b/drivers/misc/eeprom/idt_89hpesx.c
@@ -909,14 +909,18 @@ static ssize_t idt_dbgfs_csr_write(struct file *filep, const char __user *ubuf,
u32 csraddr, csrval;
char *buf;
+ if (*offp)
+ return 0;
+
/* Copy data from User-space */
buf = kmalloc(count + 1, GFP_KERNEL);
if (!buf)
return -ENOMEM;
- ret = simple_write_to_buffer(buf, count, offp, ubuf, count);
- if (ret < 0)
+ if (copy_from_user(buf, ubuf, count)) {
+ ret = -EFAULT;
goto free_buf;
+ }
buf[count] = 0;
/* Find position of colon in the buffer */
--
2.35.1
