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| author | KAMBAROV, ZAUR <kambarov@berkeley.edu> | 2005-06-24 22:20:35 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2005-07-12 11:52:56 -0700 |
| commit | b2134bcd2e1bf989e0566dd1b0e59a792722b671 (patch) | |
| tree | 20ae79f13afa14c0bee52c03daaae4e732af1417 /drivers/usb/host/ohci-hub.c | |
| parent | 99f83c9c9ac994c844ecf3e64e848c2f8dd7dfe0 (diff) | |
| download | lwn-b2134bcd2e1bf989e0566dd1b0e59a792722b671.tar.gz lwn-b2134bcd2e1bf989e0566dd1b0e59a792722b671.zip | |
[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/ohci-hub.c')
| -rw-r--r-- | drivers/usb/host/ohci-hub.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/usb/host/ohci-hub.c b/drivers/usb/host/ohci-hub.c index e2fc4129dfc6..83ca4549a50e 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; } |