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| author |   Xinyu Liu <katieeliu@tencent.com> | 2025-06-30 10:02:56 +0800 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-07-01 16:16:32 +0200 |
| commit | cf16f408364efd8a68f39011a3b073c83a03612d (patch) | |
| tree | e901a105dc0d5adb89bda5a3e722bc074db14c3c | |
| parent | usb: dwc2: disable platform lowlevel hw resources during shutdown (diff) | |
| download | wireguard-linux-cf16f408364efd8a68f39011a3b073c83a03612d.tar.xz wireguard-linux-cf16f408364efd8a68f39011a3b073c83a03612d.zip | |
usb: core: config: Prevent OOB read in SS endpoint companion parsing
usb_parse_ss_endpoint_companion() checks descriptor type before length,
enabling a potentially odd read outside of the buffer size.
Fix this up by checking the size first before looking at any of the
fields in the descriptor.
Signed-off-by: Xinyu Liu <katieeliu@tencent.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/core/config.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c index fc0cfd94cbab..42468bbeffd2 100644 --- a/drivers/usb/core/config.c +++ b/drivers/usb/core/config.c @@ -107,8 +107,14 @@ static void usb_parse_ss_endpoint_companion(struct device *ddev, int cfgno, */ desc = (struct usb_ss_ep_comp_descriptor *) buffer; - if (desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP || - size < USB_DT_SS_EP_COMP_SIZE) { + if (size < USB_DT_SS_EP_COMP_SIZE) { + dev_notice(ddev, + "invalid SuperSpeed endpoint companion descriptor " + "of length %d, skipping\n", size); + return; + } + + if (desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP) { dev_notice(ddev, "No SuperSpeed endpoint companion for config %d " " interface %d altsetting %d ep %d: " "using minimum values\n", |