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core: protect against modem removal in critical callbacks (rh #553953)

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There are more places to handle, but these are the most critical.  If
the modem is removed while a command is in-progress, the mm-callback-info
code will set info->modem to NULL.  Make sure we check for that in
callbacks and return a reasonable error.  Previous code would just
blindly forge ahead and die on a null dereference.
This commit is contained in:
Dan Williams
2010-01-19 03:16:34 -08:00
parent 73e10c77d3
commit 50ad39b28e
7 changed files with 128 additions and 75 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
src/mm-callback-info.c
View File

@@ -11,6 +11,7 @@
* GNU General Public License for more details:
*
* Copyright (C) 2008 Novell, Inc.
* Copyright (C) 2009 - 2010 Red Hat, Inc.
*/
#include "mm-callback-info.h"
@@ -55,8 +56,8 @@ modem_destroyed_cb (gpointer data, GObject *destroyed)
info->modem = NULL;
if (!info->pending_id) {
info->error = g_error_new_literal (MM_MODEM_ERROR,
MM_MODEM_ERROR_GENERAL,
"The modem was removed or disabled.");
MM_MODEM_ERROR_REMOVED,
"The modem was removed.");
mm_callback_info_schedule (info);
}
}

3
src/mm-errors.c
View File

@@ -11,7 +11,7 @@
* GNU General Public License for more details:
*
* Copyright (C) 2008 Novell, Inc.
* Copyright (C) 2009 Red Hat, Inc.
* Copyright (C) 2009 - 2010 Red Hat, Inc.
*/
#include "mm-errors.h"
@@ -72,6 +72,7 @@ mm_modem_error_get_type (void)
ENUM_ENTRY (MM_MODEM_ERROR_CONNECTED, "Connected"),
ENUM_ENTRY (MM_MODEM_ERROR_DISCONNECTED, "Disconnected"),
ENUM_ENTRY (MM_MODEM_ERROR_OPERATION_IN_PROGRESS, "OperationInProgress"),
ENUM_ENTRY (MM_MODEM_ERROR_REMOVED, "Removed"),
{ 0, 0, 0 }
};

3
src/mm-errors.h
View File

@@ -38,7 +38,8 @@ enum {
MM_MODEM_ERROR_OPERATION_NOT_SUPPORTED = 1,
MM_MODEM_ERROR_CONNECTED = 2,
MM_MODEM_ERROR_DISCONNECTED = 3,
MM_MODEM_ERROR_OPERATION_IN_PROGRESS = 4
MM_MODEM_ERROR_OPERATION_IN_PROGRESS = 4,
MM_MODEM_ERROR_REMOVED = 5
};
#define MM_MODEM_ERROR (mm_modem_error_quark ())

51
src/mm-generic-cdma.c
View File

@@ -11,7 +11,7 @@
* GNU General Public License for more details:
*
* Copyright (C) 2008 - 2009 Novell, Inc.
* Copyright (C) 2009 Red Hat, Inc.
* Copyright (C) 2009 - 2010 Red Hat, Inc.
*/
#include <string.h>
@@ -478,13 +478,15 @@ static void
disable_all_done (MMModem *modem, GError *error, gpointer user_data)
{
MMCallbackInfo *info = user_data;
info->error = mm_modem_check_removed (modem, error);
if (info->error) {
if (modem)
disable_set_previous_state (modem, info);
} else {
MMGenericCdma *self = MM_GENERIC_CDMA (info->modem);
MMGenericCdmaPrivate *priv = MM_GENERIC_CDMA_GET_PRIVATE (self);
if (error) {
disable_set_previous_state (MM_MODEM (modem), info);
info->error = g_error_copy (error);
} else {
mm_serial_port_close (priv->primary);
mm_modem_set_state (modem, MM_MODEM_STATE_DISABLED, MM_MODEM_STATE_REASON_NONE);
@@ -501,19 +503,23 @@ disable_flash_done (MMSerialPort *port,
gpointer user_data)
{
MMCallbackInfo *info = user_data;
MMGenericCdma *self = MM_GENERIC_CDMA (info->modem);
MMGenericCdma *self;
if (error) {
info->error = mm_modem_check_removed (info->modem, error);
if (info->error) {
if (info->modem)
disable_set_previous_state (info->modem, info);
info->error = g_error_copy (error);
mm_callback_info_schedule (info);
} else {
return;
}
self = MM_GENERIC_CDMA (info->modem);
if (MM_GENERIC_CDMA_GET_CLASS (self)->post_disable)
MM_GENERIC_CDMA_GET_CLASS (self)->post_disable (self, disable_all_done, info);
else
disable_all_done (MM_MODEM (self), NULL, info);
}
}
static void
disable (MMModem *modem,
@@ -557,13 +563,15 @@ dial_done (MMSerialPort *port,
gpointer user_data)
{
MMCallbackInfo *info = (MMCallbackInfo *) user_data;
MMGenericCdma *self = MM_GENERIC_CDMA (info->modem);
MMGenericCdmaPrivate *priv = MM_GENERIC_CDMA_GET_PRIVATE (self);;
if (error) {
info->error = g_error_copy (error);
info->error = mm_modem_check_removed (info->modem, error);
if (info->error) {
if (info->modem)
update_enabled_state (MM_GENERIC_CDMA (info->modem), FALSE, MM_MODEM_STATE_REASON_NONE);
} else {
MMGenericCdma *self = MM_GENERIC_CDMA (info->modem);
MMGenericCdmaPrivate *priv = MM_GENERIC_CDMA_GET_PRIVATE (self);
/* Clear reg tries; we're obviously registered by this point */
registration_cleanup (self, 0, 0);
@@ -598,24 +606,21 @@ disconnect_flash_done (MMSerialPort *port,
gpointer user_data)
{
MMCallbackInfo *info = (MMCallbackInfo *) user_data;
MMGenericCdmaPrivate *priv = MM_GENERIC_CDMA_GET_PRIVATE (info->modem);
if (error) {
MMModemState prev_state;
info->error = mm_modem_check_removed (info->modem, error);
if (info->error) {
if (info->modem) {
/* Reset old state since the operation failed */
prev_state = GPOINTER_TO_UINT (mm_callback_info_get_data (info, MM_GENERIC_CDMA_PREV_STATE_TAG));
mm_modem_set_state (MM_MODEM (info->modem),
prev_state,
MM_MODEM_STATE_REASON_NONE);
info->error = g_error_copy (error);
mm_callback_info_schedule (info);
return;
}
mm_port_set_connected (priv->data, FALSE);
} else {
mm_port_set_connected (MM_GENERIC_CDMA_GET_PRIVATE (info->modem)->data, FALSE);
update_enabled_state (MM_GENERIC_CDMA (info->modem), FALSE, MM_MODEM_STATE_REASON_NONE);
}
mm_callback_info_schedule (info);
}

31
src/mm-generic-gsm.c
View File

@@ -11,7 +11,7 @@
* GNU General Public License for more details:
*
* Copyright (C) 2008 - 2009 Novell, Inc.
* Copyright (C) 2009 Red Hat, Inc.
* Copyright (C) 2009 - 2010 Red Hat, Inc.
* Copyright (C) 2009 Ericsson
*/
@@ -538,6 +538,9 @@ disable_done (MMSerialPort *port,
gpointer user_data)
{
MMCallbackInfo *info = user_data;
info->error = mm_modem_check_removed (info->modem, error);
if (!info->error) {
MMGenericGsmPrivate *priv = MM_GENERIC_GSM_GET_PRIVATE (info->modem);
mm_serial_port_close (port);
@@ -545,6 +548,7 @@ disable_done (MMSerialPort *port,
MM_MODEM_STATE_DISABLED,
MM_MODEM_STATE_REASON_NONE);
priv->reg_status = MM_MODEM_GSM_NETWORK_REG_STATUS_UNKNOWN;
}
mm_callback_info_schedule (info);
}
@@ -554,18 +558,19 @@ disable_flash_done (MMSerialPort *port,
gpointer user_data)
{
MMCallbackInfo *info = user_data;
MMModemState prev_state;
char *cmd = NULL;
if (error) {
MMModemState prev_state;
info->error = mm_modem_check_removed (info->modem, error);
if (info->error) {
if (info->modem) {
/* Reset old state since the operation failed */
prev_state = GPOINTER_TO_UINT (mm_callback_info_get_data (info, MM_GENERIC_GSM_PREV_STATE_TAG));
mm_modem_set_state (MM_MODEM (info->modem),
prev_state,
MM_MODEM_STATE_REASON_NONE);
}
info->error = g_error_copy (error);
mm_callback_info_schedule (info);
return;
}
@@ -1374,25 +1379,25 @@ disconnect_flash_done (MMSerialPort *port,
gpointer user_data)
{
MMCallbackInfo *info = (MMCallbackInfo *) user_data;
MMGenericGsm *self = MM_GENERIC_GSM (info->modem);
MMGenericGsmPrivate *priv = MM_GENERIC_GSM_GET_PRIVATE (self);
if (error) {
MMModemState prev_state;
info->error = mm_modem_check_removed (info->modem, error);
if (info->error) {
if (info->modem) {
/* Reset old state since the operation failed */
prev_state = GPOINTER_TO_UINT (mm_callback_info_get_data (info, MM_GENERIC_GSM_PREV_STATE_TAG));
mm_modem_set_state (MM_MODEM (info->modem),
prev_state,
MM_MODEM_STATE_REASON_NONE);
info->error = g_error_copy (error);
mm_callback_info_schedule (info);
return;
}
} else {
MMGenericGsm *self = MM_GENERIC_GSM (info->modem);
MMGenericGsmPrivate *priv = MM_GENERIC_GSM_GET_PRIVATE (self);
mm_port_set_connected (priv->data, FALSE);
mm_generic_gsm_update_enabled_state (self, FALSE, MM_MODEM_STATE_REASON_NONE);
}
mm_callback_info_schedule (info);
}

46
src/mm-modem.c
View File

@@ -11,7 +11,7 @@
* GNU General Public License for more details:
*
* Copyright (C) 2008 - 2009 Novell, Inc.
* Copyright (C) 2009 Red Hat, Inc.
* Copyright (C) 2009 - 2010 Red Hat, Inc.
*/
#include <string.h>
@@ -29,6 +29,28 @@ static void impl_modem_get_info (MMModem *modem, DBusGMethodInvocation *context)
#include "mm-modem-glue.h"
/* Should be used from callbacks to check whether the modem was removed after
* the callback's operation was started, but before the callback itself was
* called, in which case the MMModem passed to the callback is NULL.
*/
GError *
mm_modem_check_removed (MMModem *self, const GError *error)
{
if (g_error_matches (error, MM_MODEM_ERROR, MM_MODEM_ERROR_REMOVED))
return g_error_copy (error);
if (!self) {
/* If the modem was NULL, the error *should* have been
* MM_MODEM_ERROR_REMOVED. If it wasn't, make it that.
*/
return g_error_new_literal (MM_MODEM_ERROR,
MM_MODEM_ERROR_REMOVED,
"The modem was removed.");
}
return NULL;
}
static void
async_op_not_supported (MMModem *self,
MMModemFn callback,
@@ -92,7 +114,6 @@ finish_disable (MMModem *self,
MMModemFn callback,
gpointer user_data)
{
if (MM_MODEM_GET_INTERFACE (self)->disable)
MM_MODEM_GET_INTERFACE (self)->disable (self, callback, user_data);
else
@@ -110,9 +131,27 @@ disable_disconnect_done (MMModem *self,
gpointer user_data)
{
DisableDisconnectInfo *cb_data = user_data;
GError *tmp_error = NULL;
/* Check for modem removal */
if (g_error_matches (error, MM_MODEM_ERROR, MM_MODEM_ERROR_REMOVED))
tmp_error = g_error_copy (error);
else if (!self) {
tmp_error = g_error_new_literal (MM_MODEM_ERROR,
MM_MODEM_ERROR_REMOVED,
"The modem was removed.");
}
/* And send an immediate error reply if the modem was removed */
if (tmp_error) {
cb_data->callback (NULL, tmp_error, cb_data->user_data);
g_free (cb_data);
g_error_free (tmp_error);
return;
}
/* ignore errors */
if (error) {
/* Don't really care what the error was; log it and proceed to disable */
g_warning ("%s: (%s): error disconnecting the modem while disabling: (%d) %s",
__func__,
mm_modem_get_device (self),
@@ -337,7 +376,6 @@ mm_modem_disconnect (MMModem *self,
return;
}
if (MM_MODEM_GET_INTERFACE (self)->disconnect)
MM_MODEM_GET_INTERFACE (self)->disconnect (self, callback, user_data);
else

2
src/mm-modem.h
View File

@@ -213,5 +213,7 @@ void mm_modem_set_state (MMModem *self,
MMModemState new_state,
MMModemStateReason reason);
GError *mm_modem_check_removed (MMModem *self, const GError *error);
#endif /* MM_MODEM_H */