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USB: hub: Avoid NULL pointer dereference when hub doesn't have any ports 

Return an error if hub->descriptor->bNbrPorts==0. Without this additional
check, we can end up doing a "hub->ports = kzalloc(0, GFP_KERNEL)".
This hub->ports pointer will therefore be non-NULL and will be used.
Example of dmesg:
   INIT: usb 1-1: New USB device found, idVendor=0424, idProduct=2512
   usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
   hub 1-1:1.0: USB hub found
   version 2.86 bootinghub 1-1:1.0: 0 ports detected
   Unable to handle kernel NULL pointer dereference at virtual address 00000010

Signed-off-by: David Linares <dlinares.linux@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Linares 2013-03-25 10:50:27 +00:00 committed by Greg Kroah-Hartman
parent 5410a473fb
commit 769d7368b1
1 changed files with 4 additions and 0 deletions
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4
drivers/usb/core/hub.c
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@ -1317,6 +1317,10 @@ static int hub_configure(struct usb_hub *hub,
message = "hub has too many ports!";
ret = -ENODEV;
goto fail;
} else if (hub->descriptor->bNbrPorts == 0) {
message = "hub doesn't have any ports!";
ret = -ENODEV;
goto fail;
}
hdev->maxchild = hub->descriptor->bNbrPorts;