Messages in this thread Patch in this message | | | From | Luis Henriques <> | Subject | [PATCH 3.11 172/272] [media] lirc_zilog: Don't use dynamic static allocation | Date | Fri, 6 Dec 2013 12:57:41 +0000 |
| |
3.11.10.1 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Mauro Carvalho Chehab <m.chehab@samsung.com>
commit ac5b4b6bf0c84c48d7e2e3fce22e35b04282ba76 upstream.
Dynamic static allocation is evil, as Kernel stack is too low, and ompilation complains about it on some archs: drivers/staging/media/lirc/lirc_zilog.c:967:1: warning: 'read' uses dynamic stack allocation [enabled by default] Instead, let's enforce a limit for the buffer to be 64. That should be more than enough.
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com> Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com> Signed-off-by: Luis Henriques <luis.henriques@canonical.com> --- drivers/staging/media/lirc/lirc_zilog.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/media/lirc/lirc_zilog.c b/drivers/staging/media/lirc/lirc_zilog.c index 11d5338..0feeaad 100644 --- a/drivers/staging/media/lirc/lirc_zilog.c +++ b/drivers/staging/media/lirc/lirc_zilog.c @@ -61,6 +61,9 @@ #include <media/lirc_dev.h> #include <media/lirc.h> +/* Max transfer size done by I2C transfer functions */ +#define MAX_XFER_SIZE 64 + struct IR; struct IR_rx { @@ -941,7 +944,14 @@ static ssize_t read(struct file *filep, char *outbuf, size_t n, loff_t *ppos) schedule(); set_current_state(TASK_INTERRUPTIBLE); } else { - unsigned char buf[rbuf->chunk_size]; + unsigned char buf[MAX_XFER_SIZE]; + + if (rbuf->chunk_size > sizeof(buf)) { + zilog_error("chunk_size is too big (%d)!\n", + rbuf->chunk_size); + ret = -EINVAL; + break; + } m = lirc_buffer_read(rbuf, buf); if (m == rbuf->chunk_size) { ret = copy_to_user((void *)outbuf+written, buf, -- 1.8.3.2
| |