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| author | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2008-02-20 21:10:06 +0100 |
|---|---|---|
| committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2008-02-21 19:05:56 +0100 |
| commit | fae603121428ba83b7343c88e68a7144525ab3eb (patch) | |
| tree | 41283a905b089cee26103187e54935abffb88207 | |
| parent | Documentation: correction to debugging-via-ohci1394 (diff) | |
| download | linux-fae603121428ba83b7343c88e68a7144525ab3eb.tar.xz linux-fae603121428ba83b7343c88e68a7144525ab3eb.zip | |
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>
| -rw-r--r-- | drivers/firewire/fw-cdev.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/firewire/fw-cdev.c b/drivers/firewire/fw-cdev.c index 44ccee26c368..46bc197a047f 100644 --- a/drivers/firewire/fw-cdev.c +++ b/drivers/firewire/fw-cdev.c @@ -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); |