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USB: core: only clean up what we allocated 

commit 32fd87b3bb upstream.

When cleaning up the configurations, make sure we only free the number
of configurations and interfaces that we could have allocated.

Reported-by: Andrey Konovalov <andreyknvl@google.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andrey Konovalov 2017-12-11 22:48:41 +01:00 committed by Greg Kroah-Hartman
parent e6008a0525
commit 69697675d3
1 changed files with 6 additions and 3 deletions
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9
drivers/usb/core/config.c
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@ -763,18 +763,21 @@ void usb_destroy_configuration(struct usb_device *dev)
return;
if (dev->rawdescriptors) {
for (i = 0; i < dev->descriptor.bNumConfigurations; i++)
for (i = 0; i < dev->descriptor.bNumConfigurations &&
i < USB_MAXCONFIG; i++)
kfree(dev->rawdescriptors[i]);
kfree(dev->rawdescriptors);
dev->rawdescriptors = NULL;
}
for (c = 0; c < dev->descriptor.bNumConfigurations; c++) {
for (c = 0; c < dev->descriptor.bNumConfigurations &&
c < USB_MAXCONFIG; c++) {
struct usb_host_config *cf = &dev->config[c];
kfree(cf->string);
for (i = 0; i < cf->desc.bNumInterfaces; i++) {
for (i = 0; i < cf->desc.bNumInterfaces &&
i < USB_MAXINTERFACES; i++) {
if (cf->intf_cache[i])
kref_put(&cf->intf_cache[i]->ref,
usb_release_interface_cache);