Date: Wed, 31 Mar 2010 16:26:39 +0200 From: "Clemens Ladisch" Subject: firewire: cdev: disallow receive packets without header In receive contexts, reject packets with header_length==0. This would be an instruction to queue zero packets which would not make sense. This prevents a division by zero in the OHCI driver. Signed-off-by: Clemens Ladisch Signed-off-by: Stefan Richter --- drivers/firewire/core-cdev.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) Index: b/drivers/firewire/core-cdev.c =================================================================== --- a/drivers/firewire/core-cdev.c +++ b/drivers/firewire/core-cdev.c @@ -968,7 +968,8 @@ static int ioctl_queue_iso(struct client if (ctx->header_size == 0) { if (u.packet.header_length > 0) return -EINVAL; - } else if (u.packet.header_length % ctx->header_size != 0) { + } else if (u.packet.header_length == 0 || + u.packet.header_length % ctx->header_size != 0) { return -EINVAL; } header_length = 0;