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firewire: Fix the range check for the queue_iso payload pointer.

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Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (renamed a variable)
This commit is contained in:
Kristian Høgsberg 2007-03-28 20:46:23 +02:00 committed by Stefan Richter
parent c5dfd0a5b0
commit ef370ee74b
1 changed files with 5 additions and 5 deletions
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10
drivers/firewire/fw-device-cdev.c
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@ -711,7 +711,7 @@ static int ioctl_queue_iso(struct client *client, void __user *arg)
struct fw_cdev_queue_iso request;
struct fw_cdev_iso_packet __user *p, *end, *next;
struct fw_iso_context *ctx = client->iso_context;
unsigned long payload, payload_end, header_length;
unsigned long payload, buffer_end, header_length;
int count;
struct {
struct fw_iso_packet packet;
@ -732,11 +732,11 @@ static int ioctl_queue_iso(struct client *client, void __user *arg)
* and the request.data pointer is ignored.*/
payload = (unsigned long)request.data - client->vm_start;
payload_end = payload + (client->buffer.page_count << PAGE_SHIFT);
buffer_end = client->buffer.page_count << PAGE_SHIFT;
if (request.data == 0 || client->buffer.pages == NULL ||
payload >= payload_end) {
payload >= buffer_end) {
payload = 0;
payload_end = 0;
buffer_end = 0;
}
if (!access_ok(VERIFY_READ, request.packets, request.size))
@ -773,7 +773,7 @@ static int ioctl_queue_iso(struct client *client, void __user *arg)
if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
u.packet.header_length + u.packet.payload_length > 0)
return -EINVAL;
if (payload + u.packet.payload_length > payload_end)
if (payload + u.packet.payload_length > buffer_end)
return -EINVAL;
if (fw_iso_context_queue(ctx, &u.packet,