[PATCH 04/14] staging: gasket: avoid copy to user on error in coherent alloc config

[Todd Poynor]

From: Todd Poynor <toddpoynor@xxxxxxxxxx>

gasket_config_coherent_allocator() on error return the error to caller
without copying a possibly-update DMA address back to userspace.

Reported-by: Dmitry Torokhov <dtor@xxxxxxxxxxxx>
Signed-off-by: Todd Poynor <toddpoynor@xxxxxxxxxx>
---
 drivers/staging/gasket/gasket_ioctl.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/gasket/gasket_ioctl.c b/drivers/staging/gasket/gasket_ioctl.c
index 1b164ac7a0496..8cf094b90cdb0 100644
--- a/drivers/staging/gasket/gasket_ioctl.c
+++ b/drivers/staging/gasket/gasket_ioctl.c
@@ -441,8 +441,10 @@ static int gasket_config_coherent_allocator(
 			gasket_dev, ibuf.size, &ibuf.dma_address,
 			ibuf.page_table_index);
 	}
+	if (ret)
+		return ret;
 	if (copy_to_user(argp, &ibuf, sizeof(ibuf)))
 		return -EFAULT;
 
-	return ret;
+	return 0;
 }
-- 
2.18.0.233.g985f88cf7e-goog