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authorKAMBAROV, ZAUR <kambarov@berkeley.edu>2005-06-24 22:20:35 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2005-07-12 11:52:56 -0700
commitb2134bcd2e1bf989e0566dd1b0e59a792722b671 (patch)
tree20ae79f13afa14c0bee52c03daaae4e732af1417 /drivers/usb/host
parent99f83c9c9ac994c844ecf3e64e848c2f8dd7dfe0 (diff)
[PATCH] USB: coverity: (desc->bitmap)[] overrun fix
The length of the array desc->bitmap is 3, and not 4: Definitions involved: In drivers/usb/core/hcd.h 464 #define bitmap DeviceRemovable In drivers/usb/host/ohci-hub.c 395 struct usb_hub_descriptor *desc In drivers/usb/core/hub.h 130 struct usb_hub_descriptor { 131 __u8 bDescLength; 132 __u8 bDescriptorType; 133 __u8 bNbrPorts; 134 __u16 wHubCharacteristics; 135 __u8 bPwrOn2PwrGood; 136 __u8 bHubContrCurrent; 137 /* add 1 bit for hub status change; round to bytes */ 138 __u8 DeviceRemovable[(USB_MAXCHILDREN + 1 + 7) / 8]; 139 __u8 PortPwrCtrlMask[(USB_MAXCHILDREN + 1 + 7) / 8]; 140 } __attribute__ ((packed)); In include/linux/usb.h 306 #define USB_MAXCHILDREN (16) This defect was found automatically by Coverity Prevent, a static analysis tool. (akpm: this code should be shot. Field `bitmap' doesn't exist in struct usb_hub_descriptor. And this .c file is #included in drivers/usb/host/ohci-hcd.c, and someone somewhere #defines `bitmap' to `DeviceRemovable'. >From a maintainability POV it would be better to memset the whole array beforehand - I changed the patch to do that) Signed-off-by: Zaur Kambarov <zkambarov@coverity.com> Cc: <linux-usb-devel@lists.sourceforge.net? Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host')
-rw-r--r--drivers/usb/host/ohci-hub.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/usb/host/ohci-hub.c b/drivers/usb/host/ohci-hub.c
index e2fc4129dfc..83ca4549a50 100644
--- a/drivers/usb/host/ohci-hub.c
+++ b/drivers/usb/host/ohci-hub.c
@@ -419,10 +419,11 @@ ohci_hub_descriptor (
/* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
rh = roothub_b (ohci);
+ memset(desc->bitmap, 0xff, sizeof(desc->bitmap));
desc->bitmap [0] = rh & RH_B_DR;
if (ports > 7) {
desc->bitmap [1] = (rh & RH_B_DR) >> 8;
- desc->bitmap [2] = desc->bitmap [3] = 0xff;
+ desc->bitmap [2] = 0xff;
} else
desc->bitmap [1] = 0xff;
}