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usb: fix some memory allocation issues (CVE-2021-3527). usb: add stubs, allow building without usb subsystem. # gpg: Signature made Wed 05 May 2021 14:07:02 BST # gpg: using RSA key A0328CFFB93A17A79901FE7D4CB6D8EED3E87138 # gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>" [full] # gpg: aka "Gerd Hoffmann <gerd@kraxel.org>" [full] # gpg: aka "Gerd Hoffmann (private) <kraxel@gmail.com>" [full] # Primary key fingerprint: A032 8CFF B93A 17A7 9901 FE7D 4CB6 D8EE D3E8 7138 * remotes/kraxel/tags/usb-20210505-pull-request: usb: limit combined packets to 1 MiB (CVE-2021-3527) usb/mtp: avoid dynamic stack allocation usb/redir: avoid dynamic stack allocation (CVE-2021-3527) usb/hid: avoid dynamic stack allocation hw/usb: Do not build USB subsystem if not required hw/usb/host-stub: Remove unused header Signed-off-by: Peter Maydell <peter.maydell@linaro.org>