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Message-Id: <20200519173425.4724-1-oscar.carter@gmx.com>
Date: Tue, 19 May 2020 19:34:25 +0200
From: Oscar Carter <oscar.carter@....com>
To: Kees Cook <keescook@...omium.org>,
Stefan Richter <stefanr@...6.in-berlin.de>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Clemens Ladisch <clemens@...isch.de>,
Takashi Sakamoto <o-takashi@...amocchi.jp>,
Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc: kernel-hardening@...ts.openwall.com,
linux1394-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
alsa-devel@...a-project.org, Oscar Carter <oscar.carter@....com>,
"Lev R . Oshvang ." <levonshe@...il.com>
Subject: [PATCH v2] firewire: Remove function callback casts
In an effort to enable -Wcast-function-type in the top-level Makefile to
support Control Flow Integrity builds, remove all the function callback
casts.
To do this, modify the "fw_iso_context_create" function prototype adding
a new parameter for the multichannel callback. Also, fix all the
function calls accordingly.
In the "fw_iso_context_create" function return an error code if both
callback parameters are NULL and also set the "ctx->callback.sc"
explicity to NULL in this case. It is not necessary set to NULL the
"ctx->callback.mc" variable because this and "ctx->callback.sc" are an
union and setting one implies setting the other one to the same value.
Signed-off-by: Oscar Carter <oscar.carter@....com>
---
Changelog v1->v2
-Set explicity to NULL the "ctx->callback.sc" variable and return an error
code in "fw_iso_context_create" function if both callback parameters are
NULL as Lev R. Oshvang suggested.
-Modify the commit changelog accordingly.
drivers/firewire/core-cdev.c | 12 +++++++-----
drivers/firewire/core-iso.c | 14 ++++++++++++--
drivers/firewire/net.c | 2 +-
drivers/media/firewire/firedtv-fw.c | 3 ++-
include/linux/firewire.h | 3 ++-
sound/firewire/amdtp-stream.c | 2 +-
sound/firewire/isight.c | 4 ++--
7 files changed, 27 insertions(+), 13 deletions(-)
diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c
index 6e291d8f3a27..cc368b35be2e 100644
--- a/drivers/firewire/core-cdev.c
+++ b/drivers/firewire/core-cdev.c
@@ -957,7 +957,8 @@ static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg)
{
struct fw_cdev_create_iso_context *a = &arg->create_iso_context;
struct fw_iso_context *context;
- fw_iso_callback_t cb;
+ fw_iso_callback_t cb_sc = NULL;
+ fw_iso_mc_callback_t cb_mc = NULL;
int ret;
BUILD_BUG_ON(FW_CDEV_ISO_CONTEXT_TRANSMIT != FW_ISO_CONTEXT_TRANSMIT ||
@@ -970,7 +971,7 @@ static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg)
if (a->speed > SCODE_3200 || a->channel > 63)
return -EINVAL;
- cb = iso_callback;
+ cb_sc = iso_callback;
break;
case FW_ISO_CONTEXT_RECEIVE:
@@ -978,11 +979,11 @@ static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg)
a->channel > 63)
return -EINVAL;
- cb = iso_callback;
+ cb_sc = iso_callback;
break;
case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
- cb = (fw_iso_callback_t)iso_mc_callback;
+ cb_mc = iso_mc_callback;
break;
default:
@@ -990,7 +991,8 @@ static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg)
}
context = fw_iso_context_create(client->device->card, a->type,
- a->channel, a->speed, a->header_size, cb, client);
+ a->channel, a->speed, a->header_size, cb_sc, cb_mc,
+ client);
if (IS_ERR(context))
return PTR_ERR(context);
if (client->version < FW_CDEV_VERSION_AUTO_FLUSH_ISO_OVERFLOW)
diff --git a/drivers/firewire/core-iso.c b/drivers/firewire/core-iso.c
index 185b0b78b3d6..1d28a98c08b2 100644
--- a/drivers/firewire/core-iso.c
+++ b/drivers/firewire/core-iso.c
@@ -131,7 +131,8 @@ size_t fw_iso_buffer_lookup(struct fw_iso_buffer *buffer, dma_addr_t completed)
struct fw_iso_context *fw_iso_context_create(struct fw_card *card,
int type, int channel, int speed, size_t header_size,
- fw_iso_callback_t callback, void *callback_data)
+ fw_iso_callback_t cb_sc, fw_iso_mc_callback_t cb_mc,
+ void *callback_data)
{
struct fw_iso_context *ctx;
@@ -145,7 +146,16 @@ struct fw_iso_context *fw_iso_context_create(struct fw_card *card,
ctx->channel = channel;
ctx->speed = speed;
ctx->header_size = header_size;
- ctx->callback.sc = callback;
+
+ if (cb_sc) {
+ ctx->callback.sc = cb_sc;
+ } else if (cb_mc) {
+ ctx->callback.mc = cb_mc;
+ } else {
+ ctx->callback.sc = NULL;
+ return ERR_PTR(-EINVAL);
+ }
+
ctx->callback_data = callback_data;
return ctx;
diff --git a/drivers/firewire/net.c b/drivers/firewire/net.c
index 715e491dfbc3..c5cc0a311aa0 100644
--- a/drivers/firewire/net.c
+++ b/drivers/firewire/net.c
@@ -1136,7 +1136,7 @@ static int fwnet_broadcast_start(struct fwnet_device *dev)
context = fw_iso_context_create(dev->card, FW_ISO_CONTEXT_RECEIVE,
IEEE1394_BROADCAST_CHANNEL,
dev->card->link_speed, 8,
- fwnet_receive_broadcast, dev);
+ fwnet_receive_broadcast, NULL, dev);
if (IS_ERR(context)) {
retval = PTR_ERR(context);
goto failed;
diff --git a/drivers/media/firewire/firedtv-fw.c b/drivers/media/firewire/firedtv-fw.c
index 97144734eb05..d2940adefd8c 100644
--- a/drivers/media/firewire/firedtv-fw.c
+++ b/drivers/media/firewire/firedtv-fw.c
@@ -141,7 +141,8 @@ int fdtv_start_iso(struct firedtv *fdtv)
ctx->context = fw_iso_context_create(device->card,
FW_ISO_CONTEXT_RECEIVE, fdtv->isochannel,
- device->max_speed, ISO_HEADER_SIZE, handle_iso, fdtv);
+ device->max_speed, ISO_HEADER_SIZE,
+ handle_iso, NULL, fdtv);
if (IS_ERR(ctx->context)) {
err = PTR_ERR(ctx->context);
goto fail_free;
diff --git a/include/linux/firewire.h b/include/linux/firewire.h
index aec8f30ab200..3a0b5e18e140 100644
--- a/include/linux/firewire.h
+++ b/include/linux/firewire.h
@@ -452,7 +452,8 @@ struct fw_iso_context {
struct fw_iso_context *fw_iso_context_create(struct fw_card *card,
int type, int channel, int speed, size_t header_size,
- fw_iso_callback_t callback, void *callback_data);
+ fw_iso_callback_t cb_sc, fw_iso_mc_callback_t cb_mc,
+ void *callback_data);
int fw_iso_context_set_channels(struct fw_iso_context *ctx, u64 *channels);
int fw_iso_context_queue(struct fw_iso_context *ctx,
struct fw_iso_packet *packet,
diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c
index 37d38efb4c87..8629ab3e2c64 100644
--- a/sound/firewire/amdtp-stream.c
+++ b/sound/firewire/amdtp-stream.c
@@ -1093,7 +1093,7 @@ static int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed,
s->context = fw_iso_context_create(fw_parent_device(s->unit)->card,
type, channel, speed, ctx_header_size,
- ctx_cb, ctx_data);
+ ctx_cb, NULL, ctx_data);
if (IS_ERR(s->context)) {
err = PTR_ERR(s->context);
if (err == -EBUSY)
diff --git a/sound/firewire/isight.c b/sound/firewire/isight.c
index 6655af53b367..51cc37fca736 100644
--- a/sound/firewire/isight.c
+++ b/sound/firewire/isight.c
@@ -361,8 +361,8 @@ static int isight_start_streaming(struct isight *isight)
isight->context = fw_iso_context_create(isight->device->card,
FW_ISO_CONTEXT_RECEIVE,
isight->resources.channel,
- isight->device->max_speed,
- 4, isight_packet, isight);
+ isight->device->max_speed, 4,
+ isight_packet, NULL, isight);
if (IS_ERR(isight->context)) {
err = PTR_ERR(isight->context);
isight->context = NULL;
--
2.20.1
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