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PCI: switchtec: Return -EFAULT for copy_to_user() errors 

switchtec_dev_read() didn't handle copy_to_user() errors correctly: it
assigned "rc = -EFAULT", but actually returned either "size", -ENXIO, or
-EBADMSG instead.

Update the failure cases to unlock mrpc_mutex and return -EFAULT directly.

Link: https://lore.kernel.org/r/20221216162126.207863-3-helgaas@kernel.org
Fixes: 080b47def5 ("MicroSemi Switchtec management interface driver")
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
This commit is contained in:
Bjorn Helgaas 2022-12-16 10:21:26 -06:00
parent 4e353ff40a
commit ddc10938e0
1 changed files with 4 additions and 5 deletions
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9
drivers/pci/switch/switchtec.c
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@ -606,21 +606,20 @@ static ssize_t switchtec_dev_read(struct file *filp, char __user *data,
rc = copy_to_user(data, &stuser->return_code,
sizeof(stuser->return_code));
if (rc) {
rc = -EFAULT;
goto out;
mutex_unlock(&stdev->mrpc_mutex);
return -EFAULT;
}
data += sizeof(stuser->return_code);
rc = copy_to_user(data, &stuser->data,
size - sizeof(stuser->return_code));
if (rc) {
rc = -EFAULT;
goto out;
mutex_unlock(&stdev->mrpc_mutex);
return -EFAULT;
}
stuser_set_state(stuser, MRPC_IDLE);
out:
mutex_unlock(&stdev->mrpc_mutex);
if (stuser->status == SWITCHTEC_MRPC_STATUS_DONE ||