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ACPI / debugger: copy_to_user doesn't return errors 

The copy_to/from_user() functions don't return error codes, they return
the number of bytes remaining.  We had intended to return -EFUALT here.
We actually have already checked access_ok() in an earlier function so
I don't think these functions will fail but let's fix it anyway.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Dan Carpenter 2015-12-24 10:24:37 +03:00 committed by Rafael J. Wysocki
parent 436db5ce0d
commit ec74765d9f
1 changed files with 6 additions and 4 deletions
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10
drivers/acpi/acpi_dbg.c
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@ -592,9 +592,10 @@ static int acpi_aml_read_user(char __user *buf, int len)
smp_rmb();
p = &crc->buf[crc->tail];
n = min(len, circ_count_to_end(crc));
ret = copy_to_user(buf, p, n);
if (IS_ERR_VALUE(ret))
if (copy_to_user(buf, p, n)) {
ret = -EFAULT;
goto out;
}
/* sync tail after removing logs */
smp_mb();
crc->tail = (crc->tail + n) & (ACPI_AML_BUF_SIZE - 1);
@ -661,9 +662,10 @@ static int acpi_aml_write_user(const char __user *buf, int len)
smp_mb();
p = &crc->buf[crc->head];
n = min(len, circ_space_to_end(crc));
ret = copy_from_user(p, buf, n);
if (IS_ERR_VALUE(ret))
if (copy_from_user(p, buf, n)) {
ret = -EFAULT;
goto out;
}
/* sync head after inserting cmds */
smp_wmb();
crc->head = (crc->head + n) & (ACPI_AML_BUF_SIZE - 1);