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220345e98f
The USB-audio mixer code holds a linked list of usb_mixer_elem_list, and several operations are performed for each mixer element. A few of them (snd_usb_mixer_notify_id() and snd_usb_mixer_interrupt_v2()) assume each mixer element being a usb_mixer_elem_info object that is a subclass of usb_mixer_elem_list, cast via container_of() and access it members. This may result in an out-of-bound access when a non-standard list element has been added, as spotted by syzkaller recently. This patch adds a new field, is_std_info, in usb_mixer_elem_list to indicate that the element is the usb_mixer_elem_info type or not, and skip the access to such an element if needed. Reported-by: syzbot+fb14314433463ad51625@syzkaller.appspotmail.com Reported-by: syzbot+2405ca3401e943c538b5@syzkaller.appspotmail.com Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20200624122340.9615-1-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
137 lines
3.8 KiB
C
137 lines
3.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __USBMIXER_H
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#define __USBMIXER_H
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#include <sound/info.h>
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struct media_mixer_ctl;
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struct usbmix_connector_map {
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u8 id;
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u8 delegated_id;
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u8 control;
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u8 channel;
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};
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struct usb_mixer_interface {
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struct snd_usb_audio *chip;
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struct usb_host_interface *hostif;
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struct list_head list;
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unsigned int ignore_ctl_error;
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struct urb *urb;
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/* array[MAX_ID_ELEMS], indexed by unit id */
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struct usb_mixer_elem_list **id_elems;
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/* the usb audio specification version this interface complies to */
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int protocol;
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/* optional connector delegation map */
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const struct usbmix_connector_map *connector_map;
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/* Sound Blaster remote control stuff */
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const struct rc_config *rc_cfg;
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u32 rc_code;
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wait_queue_head_t rc_waitq;
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struct urb *rc_urb;
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struct usb_ctrlrequest *rc_setup_packet;
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u8 rc_buffer[6];
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struct media_mixer_ctl *media_mixer_ctl;
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bool disconnected;
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void *private_data;
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void (*private_free)(struct usb_mixer_interface *mixer);
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void (*private_suspend)(struct usb_mixer_interface *mixer);
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};
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#define MAX_CHANNELS 16 /* max logical channels */
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enum {
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USB_MIXER_BOOLEAN,
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USB_MIXER_INV_BOOLEAN,
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USB_MIXER_S8,
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USB_MIXER_U8,
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USB_MIXER_S16,
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USB_MIXER_U16,
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USB_MIXER_S32,
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USB_MIXER_U32,
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};
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typedef void (*usb_mixer_elem_dump_func_t)(struct snd_info_buffer *buffer,
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struct usb_mixer_elem_list *list);
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typedef int (*usb_mixer_elem_resume_func_t)(struct usb_mixer_elem_list *elem);
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struct usb_mixer_elem_list {
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struct usb_mixer_interface *mixer;
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struct usb_mixer_elem_list *next_id_elem; /* list of controls with same id */
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struct snd_kcontrol *kctl;
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unsigned int id;
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bool is_std_info;
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usb_mixer_elem_dump_func_t dump;
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usb_mixer_elem_resume_func_t resume;
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};
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/* iterate over mixer element list of the given unit id */
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#define for_each_mixer_elem(list, mixer, id) \
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for ((list) = (mixer)->id_elems[id]; (list); (list) = (list)->next_id_elem)
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#define mixer_elem_list_to_info(list) \
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container_of(list, struct usb_mixer_elem_info, head)
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struct usb_mixer_elem_info {
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struct usb_mixer_elem_list head;
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unsigned int control; /* CS or ICN (high byte) */
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unsigned int cmask; /* channel mask bitmap: 0 = master */
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unsigned int idx_off; /* Control index offset */
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unsigned int ch_readonly;
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unsigned int master_readonly;
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int channels;
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int val_type;
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int min, max, res;
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int dBmin, dBmax;
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int cached;
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int cache_val[MAX_CHANNELS];
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u8 initialized;
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u8 min_mute;
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void *private_data;
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};
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int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
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int ignore_error);
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void snd_usb_mixer_disconnect(struct usb_mixer_interface *mixer);
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void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid);
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int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
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int request, int validx, int value_set);
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int snd_usb_mixer_add_list(struct usb_mixer_elem_list *list,
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struct snd_kcontrol *kctl,
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bool is_std_info);
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#define snd_usb_mixer_add_control(list, kctl) \
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snd_usb_mixer_add_list(list, kctl, true)
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void snd_usb_mixer_elem_init_std(struct usb_mixer_elem_list *list,
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struct usb_mixer_interface *mixer,
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int unitid);
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int snd_usb_mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
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unsigned int size, unsigned int __user *_tlv);
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#ifdef CONFIG_PM
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int snd_usb_mixer_suspend(struct usb_mixer_interface *mixer);
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int snd_usb_mixer_resume(struct usb_mixer_interface *mixer, bool reset_resume);
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#endif
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int snd_usb_set_cur_mix_value(struct usb_mixer_elem_info *cval, int channel,
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int index, int value);
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int snd_usb_get_cur_mix_value(struct usb_mixer_elem_info *cval,
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int channel, int index, int *value);
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extern void snd_usb_mixer_elem_free(struct snd_kcontrol *kctl);
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extern const struct snd_kcontrol_new *snd_usb_feature_unit_ctl;
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#endif /* __USBMIXER_H */
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