From: Xenia Ragiadakou <burzalodowa@xxxxxxxxx> The fields 'add_flags' and 'drop_flags' in struct xhci_input_control_ctx have type __le32 and need to be converted to CPU byteorder before being used to derive the number of added endpoints. This bug was found using sparse. This patch is not suitable for stable, since the bug would only be triggered on big endian systems, and the code only runs for Intel xHCI host controllers, which are always integrated into little endian systems. Signed-off-by: Xenia Ragiadakou <burzalodowa@xxxxxxxxx> Signed-off-by: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx> --- drivers/usb/host/xhci.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 1798c5353102..b7289e9a44dd 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -1892,8 +1892,8 @@ static u32 xhci_count_num_new_endpoints(struct xhci_hcd *xhci, * (bit 1). The default control endpoint is added during the Address * Device command and is never removed until the slot is disabled. */ - valid_add_flags = ctrl_ctx->add_flags >> 2; - valid_drop_flags = ctrl_ctx->drop_flags >> 2; + valid_add_flags = le32_to_cpu(ctrl_ctx->add_flags) >> 2; + valid_drop_flags = le32_to_cpu(ctrl_ctx->drop_flags) >> 2; /* Use hweight32 to count the number of ones in the add flags, or * number of endpoints added. Don't count endpoints that are changed -- 1.8.3.3 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
