From 4ba1d9c0c22947a9207029e7184733252e6135f1 Mon Sep 17 00:00:00 2001 From: Clemens Ladisch Date: Wed, 31 Mar 2010 16:26:39 +0200 Subject: [PATCH] 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(-) diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c index 8be720b278b7..bbb8160e2c99 100644 --- a/drivers/firewire/core-cdev.c +++ b/drivers/firewire/core-cdev.c @@ -968,7 +968,8 @@ static int ioctl_queue_iso(struct client *client, union ioctl_arg *arg) 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; -- 2.20.1