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brcmfmac: Add length checks on firmware events 

Add additional length checks on firmware events to create more
robust code.

Reviewed-by: Arend Van Spriel <arend@broadcom.com>
Reviewed-by: Franky (Zhenhui) Lin <frankyl@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Lei Zhang <leizh@broadcom.com>
Signed-off-by: Hante Meuleman <meuleman@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Hante Meuleman 2016-02-17 11:26:54 +01:00 committed by Kalle Valo
parent 73345fd212
commit 0aedbcaf6f
4 changed files with 87 additions and 58 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
View File

@ -3092,6 +3092,11 @@ brcmf_notify_sched_scan_results(struct brcmf_if *ifp,
brcmf_dbg(SCAN, "Enter\n");
if (e->datalen < (sizeof(*pfn_result) + sizeof(*netinfo))) {
brcmf_dbg(SCAN, "Event data to small. Ignore\n");
return 0;
}
if (e->event_code == BRCMF_E_PFN_NET_LOST) {
brcmf_dbg(SCAN, "PFN NET LOST event. Do Nothing\n");
return 0;
@ -3415,6 +3420,11 @@ brcmf_wowl_nd_results(struct brcmf_if *ifp, const struct brcmf_event_msg *e,
brcmf_dbg(SCAN, "Enter\n");
if (e->datalen < (sizeof(*pfn_result) + sizeof(*netinfo))) {
brcmf_dbg(SCAN, "Event data to small. Ignore\n");
return 0;
}
pfn_result = (struct brcmf_pno_scanresults_le *)data;
if (e->event_code == BRCMF_E_PFN_NET_LOST) {

57
drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c
View File

@ -25,50 +25,6 @@
#include "fweh.h"
#include "fwil.h"
/**
* struct brcm_ethhdr - broadcom specific ether header.
*
* @subtype: subtype for this packet.
* @length: TODO: length of appended data.
* @version: version indication.
* @oui: OUI of this packet.
* @usr_subtype: subtype for this OUI.
*/
struct brcm_ethhdr {
__be16 subtype;
__be16 length;
u8 version;
u8 oui[3];
__be16 usr_subtype;
} __packed;
struct brcmf_event_msg_be {
__be16 version;
__be16 flags;
__be32 event_type;
__be32 status;
__be32 reason;
__be32 auth_type;
__be32 datalen;
u8 addr[ETH_ALEN];
char ifname[IFNAMSIZ];
u8 ifidx;
u8 bsscfgidx;
} __packed;
/**
* struct brcmf_event - contents of broadcom event packet.
*
* @eth: standard ether header.
* @hdr: broadcom specific ether header.
* @msg: common part of the actual event message.
*/
struct brcmf_event {
struct ethhdr eth;
struct brcm_ethhdr hdr;
struct brcmf_event_msg_be msg;
} __packed;
/**
* struct brcmf_fweh_queue_item - event item on event queue.
*
@ -85,6 +41,7 @@ struct brcmf_fweh_queue_item {
u8 ifidx;
u8 ifaddr[ETH_ALEN];
struct brcmf_event_msg_be emsg;
u32 datalen;
u8 data[0];
};
@ -294,6 +251,11 @@ static void brcmf_fweh_event_worker(struct work_struct *work)
brcmf_dbg_hex_dump(BRCMF_EVENT_ON(), event->data,
min_t(u32, emsg.datalen, 64),
"event payload, len=%d\n", emsg.datalen);
if (emsg.datalen > event->datalen) {
brcmf_err("event invalid length header=%d, msg=%d\n",
event->datalen, emsg.datalen);
goto event_free;
}
/* special handling of interface event */
if (event->code == BRCMF_E_IF) {
@ -439,7 +401,8 @@ int brcmf_fweh_activate_events(struct brcmf_if *ifp)
* dispatch the event to a registered handler (using worker).
*/
void brcmf_fweh_process_event(struct brcmf_pub *drvr,
struct brcmf_event *event_packet)
struct brcmf_event *event_packet,
u32 packet_len)
{
enum brcmf_fweh_event_code code;
struct brcmf_fweh_info *fweh = &drvr->fweh;
@ -459,6 +422,9 @@ void brcmf_fweh_process_event(struct brcmf_pub *drvr,
if (code != BRCMF_E_IF && !fweh->evt_handler[code])
return;
if (datalen > BRCMF_DCMD_MAXLEN)
return;
if (in_interrupt())
alloc_flag = GFP_ATOMIC;
@ -472,6 +438,7 @@ void brcmf_fweh_process_event(struct brcmf_pub *drvr,
/* use memcpy to get aligned event message */
memcpy(&event->emsg, &event_packet->msg, sizeof(event->emsg));
memcpy(event->data, data, datalen);
event->datalen = datalen;
memcpy(event->ifaddr, event_packet->eth.h_dest, ETH_ALEN);
brcmf_fweh_queue_event(fweh, event);

68
drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.h
View File

@ -27,7 +27,6 @@
struct brcmf_pub;
struct brcmf_if;
struct brcmf_cfg80211_info;
struct brcmf_event;
/* list of firmware events */
#define BRCMF_FWEH_EVENT_ENUM_DEFLIST \
@ -180,12 +179,54 @@ enum brcmf_fweh_event_code {
/**
* definitions for event packet validation.
*/
#define BRCMF_EVENT_OUI_OFFSET 19
#define BRCM_OUI "\x00\x10\x18"
#define DOT11_OUI_LEN 3
#define BCMILCP_BCM_SUBTYPE_EVENT 1
#define BRCM_OUI "\x00\x10\x18"
#define BCMILCP_BCM_SUBTYPE_EVENT 1
/**
* struct brcm_ethhdr - broadcom specific ether header.
*
* @subtype: subtype for this packet.
* @length: TODO: length of appended data.
* @version: version indication.
* @oui: OUI of this packet.
* @usr_subtype: subtype for this OUI.
*/
struct brcm_ethhdr {
__be16 subtype;
__be16 length;
u8 version;
u8 oui[3];
__be16 usr_subtype;
} __packed;
struct brcmf_event_msg_be {
__be16 version;
__be16 flags;
__be32 event_type;
__be32 status;
__be32 reason;
__be32 auth_type;
__be32 datalen;
u8 addr[ETH_ALEN];
char ifname[IFNAMSIZ];
u8 ifidx;
u8 bsscfgidx;
} __packed;
/**
* struct brcmf_event - contents of broadcom event packet.
*
* @eth: standard ether header.
* @hdr: broadcom specific ether header.
* @msg: common part of the actual event message.
*/
struct brcmf_event {
struct ethhdr eth;
struct brcm_ethhdr hdr;
struct brcmf_event_msg_be msg;
} __packed;
/**
* struct brcmf_event_msg - firmware event message.
*
@ -256,34 +297,35 @@ void brcmf_fweh_unregister(struct brcmf_pub *drvr,
enum brcmf_fweh_event_code code);
int brcmf_fweh_activate_events(struct brcmf_if *ifp);
void brcmf_fweh_process_event(struct brcmf_pub *drvr,
struct brcmf_event *event_packet);
struct brcmf_event *event_packet,
u32 packet_len);
void brcmf_fweh_p2pdev_setup(struct brcmf_if *ifp, bool ongoing);
static inline void brcmf_fweh_process_skb(struct brcmf_pub *drvr,
struct sk_buff *skb)
{
struct brcmf_event *event_packet;
u8 *data;
u16 usr_stype;
/* only process events when protocol matches */
if (skb->protocol != cpu_to_be16(ETH_P_LINK_CTL))
return;
if ((skb->len + ETH_HLEN) < sizeof(*event_packet))
return;
/* check for BRCM oui match */
event_packet = (struct brcmf_event *)skb_mac_header(skb);
data = (u8 *)event_packet;
data += BRCMF_EVENT_OUI_OFFSET;
if (memcmp(BRCM_OUI, data, DOT11_OUI_LEN))
if (memcmp(BRCM_OUI, &event_packet->hdr.oui[0],
sizeof(event_packet->hdr.oui)))
return;
/* final match on usr_subtype */
data += DOT11_OUI_LEN;
usr_stype = get_unaligned_be16(data);
usr_stype = get_unaligned_be16(&event_packet->hdr.usr_subtype);
if (usr_stype != BCMILCP_BCM_SUBTYPE_EVENT)
return;
brcmf_fweh_process_event(drvr, event_packet);
brcmf_fweh_process_event(drvr, event_packet, skb->len + ETH_HLEN);
}
#endif /* FWEH_H_ */

10
drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c
View File

@ -1361,6 +1361,11 @@ int brcmf_p2p_notify_action_frame_rx(struct brcmf_if *ifp,
u16 mgmt_type;
u8 action;
if (e->datalen < sizeof(*rxframe)) {
brcmf_dbg(SCAN, "Event data to small. Ignore\n");
return 0;
}
ch.chspec = be16_to_cpu(rxframe->chanspec);
cfg->d11inf.decchspec(&ch);
/* Check if wpa_supplicant has registered for this frame */
@ -1858,6 +1863,11 @@ s32 brcmf_p2p_notify_rx_mgmt_p2p_probereq(struct brcmf_if *ifp,
brcmf_dbg(INFO, "Enter: event %d reason %d\n", e->event_code,
e->reason);
if (e->datalen < sizeof(*rxframe)) {
brcmf_dbg(SCAN, "Event data to small. Ignore\n");
return 0;
}
ch.chspec = be16_to_cpu(rxframe->chanspec);
cfg->d11inf.decchspec(&ch);