Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 3.12 196/212] media: lirc_zilog: Dont use dynamic static allocation | Date | Mon, 2 Dec 2013 11:16:27 -0800 |
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3.12-stable review patch. If anyone has any objections, please let me know.
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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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/staging/media/lirc/lirc_zilog.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)
--- 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, 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,
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