From b20dcb6c21f4f670569b8f756ed2c5f1ba1e44e4 Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Sat, 2 Nov 2013 08:13:02 -0300 Subject: [PATCH] media: mxl111sf: Don't use dynamic static allocation commit c98300a0e8cf160aaea60bc05d2cd156a7666173 upstream. Dynamic static allocation is evil, as Kernel stack is too low, and compilation complains about it on some archs: drivers/media/usb/dvb-usb-v2/mxl111sf.c:74:1: warning: 'mxl111sf_ctrl_msg' uses dynamic stack allocation [enabled by default] Instead, let's enforce a limit for the buffer to be the max size of a control URB payload data (64 bytes). Signed-off-by: Mauro Carvalho Chehab Reviewed-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Greg Kroah-Hartman --- drivers/media/usb/dvb-usb-v2/mxl111sf.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/media/usb/dvb-usb-v2/mxl111sf.c b/drivers/media/usb/dvb-usb-v2/mxl111sf.c index efdcb15..419a7c7 100644 --- a/drivers/media/usb/dvb-usb-v2/mxl111sf.c +++ b/drivers/media/usb/dvb-usb-v2/mxl111sf.c @@ -23,6 +23,9 @@ #include "lgdt3305.h" #include "lg2160.h" +/* Max transfer size done by I2C transfer functions */ +#define MAX_XFER_SIZE 64 + int dvb_usb_mxl111sf_debug; module_param_named(debug, dvb_usb_mxl111sf_debug, int, 0644); MODULE_PARM_DESC(debug, "set debugging level " @@ -63,7 +66,12 @@ int mxl111sf_ctrl_msg(struct dvb_usb_device *d, { int wo = (rbuf == NULL || rlen == 0); /* write-only */ int ret; - u8 sndbuf[1+wlen]; + u8 sndbuf[MAX_XFER_SIZE]; + + if (1 + wlen > sizeof(sndbuf)) { + pr_warn("%s: len=%d is too big!\n", __func__, wlen); + return -EOPNOTSUPP; + } deb_adv("%s(wlen = %d, rlen = %d)\n", __func__, wlen, rlen); -- 2.7.4