media: lirc_zilog: Don't use dynamic static allocation

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/media/lirc/lirc_zilog.c b/drivers/staging/media/lirc/lirc_zilog.c
index 11d5338b4f2ffaa458ddc6729a5ea48298e17227..0feeaadf29dc12c47eee290c7616cfaf915e6ace 100644 (file)
--- 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,