[PATCH V2 7/7] usb-misc: sisusbvga: fix error path

From: Peter Senna Tschudin
Date: Fri Jan 15 2016 - 12:42:17 EST

Remove a call to dev_err() that was reporting an unsuccesful call to
kmalloc(), as reporting memory allocation failures is redundant. Instead
of logging the error, clean up previously allocated resources and abort
the probe with -ENOMEM. Before this change sisusb->SiS_Pr could be
dereferenced even if null after failure of memory allocation.

Signed-off-by: Peter Senna Tschudin <peter.senna@xxxxxxxxxxxxx>
Changes from V1:
- This patch fixes the bug and does cleanup only on the error path that was
causing the bug.

Tested by compilation only.

drivers/usb/misc/sisusbvga/sisusb.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/misc/sisusbvga/sisusb.c b/drivers/usb/misc/sisusbvga/sisusb.c
index b3713d5..a22de52 100644
--- a/drivers/usb/misc/sisusbvga/sisusb.c
+++ b/drivers/usb/misc/sisusbvga/sisusb.c
@@ -3112,7 +3112,8 @@ static int sisusb_probe(struct usb_interface *intf,
/* Allocate our SiS_Pr */
sisusb->SiS_Pr = kmalloc(sizeof(struct SiS_Private), GFP_KERNEL);
if (!sisusb->SiS_Pr) {
- dev_err(&sisusb->sisusb_dev->dev, "Failed to allocate SiS_Pr\n");
+ retval = -ENOMEM;
+ goto error_4;