Messages in this thread Patch in this message | ![/](/images/icornerl.gif) | | From | Bjorn Helgaas <> | Subject | [PATCH v3 2/2] PCI: switchtec: Return -EFAULT for copy_to_user() errors | Date | Wed, 4 Jan 2023 14:22:23 -0600 |
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From: Bjorn Helgaas <bhelgaas@google.com>
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.
Fixes: 080b47def5e5 ("MicroSemi Switchtec management interface driver") Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Logan Gunthorpe <logang@deltatee.com> --- drivers/pci/switch/switchtec.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-)
diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c index d7ae84070e29..3d6f17ff2429 100644 --- a/drivers/pci/switch/switchtec.c +++ b/drivers/pci/switch/switchtec.c @@ -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 || -- 2.25.1
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