2.6.32-longterm review patch. If anyone has any objections, please let me know. ------------------ From: James Forshaw <forshaw@xxxxxxxxxx> commit c5fd4126151855330280ea9382684980afcfdd03 upstream This patch fixes a potential security issue in the whiteheat USB driver which might allow a local attacker to cause kernel memory corrpution. This is due to an unchecked memcpy into a fixed size buffer (of 64 bytes). On EHCI and XHCI busses it's possible to craft responses greater than 64 bytes leading a buffer overflow. Signed-off-by: James Forshaw <forshaw@xxxxxxxxxx> Cc: stable <stable@xxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> (backported from commit 6817ae225cd650fb1c3295d769298c38b1eba818) CVE-2014-3185 BugLink: http://bugs.launchpad.net/bugs/1370036 Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx> Signed-off-by: Tim Gardner <tim.gardner@xxxxxxxxxxxxx> Signed-off-by: Willy Tarreau <w@xxxxxx> --- drivers/usb/serial/whiteheat.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/usb/serial/whiteheat.c b/drivers/usb/serial/whiteheat.c index 1247be1..748c627 100644 --- a/drivers/usb/serial/whiteheat.c +++ b/drivers/usb/serial/whiteheat.c @@ -1012,6 +1012,10 @@ static void command_port_read_callback(struct urb *urb) dbg("%s - command_info is NULL, exiting.", __func__); return; } + if (!urb->actual_length) { + dev_dbg(&urb->dev->dev, "%s - empty response, exiting.\n", __func__); + return; + } if (status) { dbg("%s - nonzero urb status: %d", __func__, status); if (status != -ENOENT) @@ -1033,7 +1037,8 @@ static void command_port_read_callback(struct urb *urb) /* These are unsolicited reports from the firmware, hence no waiting command to wakeup */ dbg("%s - event received", __func__); - } else if (data[0] == WHITEHEAT_GET_DTR_RTS) { + } else if ((data[0] == WHITEHEAT_GET_DTR_RTS) && + (urb->actual_length - 1 <= sizeof(command_info->result_buffer))) { memcpy(command_info->result_buffer, &data[1], urb->actual_length - 1); command_info->command_finished = WHITEHEAT_CMD_COMPLETE; -- 1.7.12.2.21.g234cd45.dirty -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html