When reading synchronously from a non-zero endpoint, gadgetfs will
return -EFAULT even if the read succeeds, due to a bad check of the
copy_to_iter() return value.
This fix compares the return value of copy_to_iter to the amount of
bytes that was passed, and only fails if they are not the same.
Signed-off-by: Binyamin Sharet <s.binyamin@xxxxxxxxx>
---
drivers/usb/gadget/legacy/inode.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/usb/gadget/legacy/inode.c b/drivers/usb/gadget/legacy/inode.c
index aa3707b..8560f2f 100644
--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c
@@ -606,7 +606,7 @@ ep_read_iter(struct kiocb *iocb, struct iov_iter *to)
}
if (is_sync_kiocb(iocb)) {
value = ep_io(epdata, buf, len);
- if (value >= 0 && copy_to_iter(buf, value, to))
+ if (value >= 0 && (copy_to_iter(buf, value, to) != value))
value = -EFAULT;
} else {
struct kiocb_priv *priv = kzalloc(sizeof *priv, GFP_KERNEL);
--
2.7.4
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