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 80. That should
be more than enough.
Signed-off-by: Mauro Carvalho Chehab <m.chehab@xxxxxxxxxxx>
---
drivers/staging/media/lirc/lirc_zilog.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/media/lirc/lirc_zilog.c b/drivers/staging/media/lirc/lirc_zilog.c
index 11d5338b4f2f..9bcd52a962d4 100644
--- a/drivers/staging/media/lirc/lirc_zilog.c
+++ b/drivers/staging/media/lirc/lirc_zilog.c
@@ -941,7 +941,14 @@ 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[80];
+
+ if (rbuf->chunk_size > sizeof(buf)) {
+ zilog_error("chunk_size is too big (%d)!\n",
+ rbuf->chunk_size);
+ ret = -EIO;
+ break;
+ }
m = lirc_buffer_read(rbuf, buf);
if (m == rbuf->chunk_size) {
ret = copy_to_user((void *)outbuf+written, buf,
--
1.8.3.1
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