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firewire: fix NULL pointer deref. and resource leak 

By supplying ioctl()s in the wrong order, a userspace client was able to
trigger NULL pointer dereferences.  Furthermore, by calling
ioctl_create_iso_context more than once, new contexts could be created
without ever freeing the previously created contexts.

Thanks to Anders Blomdell for the report.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Stefan Richter 2008-02-20 21:10:06 +01:00
parent 09d7328e62
commit fae6031214
1 changed files with 7 additions and 2 deletions
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9
drivers/firewire/fw-cdev.c
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@ -646,6 +646,10 @@ static int ioctl_create_iso_context(struct client *client, void *buffer)
struct fw_cdev_create_iso_context *request = buffer;
struct fw_iso_context *context;
/* We only support one context at this time. */
if (client->iso_context != NULL)
return -EBUSY;
if (request->channel > 63)
return -EINVAL;
@ -792,8 +796,9 @@ static int ioctl_start_iso(struct client *client, void *buffer)
{
struct fw_cdev_start_iso *request = buffer;
if (request->handle != 0)
if (client->iso_context == NULL || request->handle != 0)
return -EINVAL;
if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
if (request->tags == 0 || request->tags > 15)
return -EINVAL;
@ -810,7 +815,7 @@ static int ioctl_stop_iso(struct client *client, void *buffer)
{
struct fw_cdev_stop_iso *request = buffer;
if (request->handle != 0)
if (client->iso_context == NULL || request->handle != 0)
return -EINVAL;
return fw_iso_context_stop(client->iso_context);