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wil6210: fix length check in __wmi_send 

The current length check:
sizeof(cmd) + len > r->entry_size
will allow very large values of len (> U16_MAX - sizeof(cmd))
and can cause a buffer overflow. Fix the check to cover this case.
In addition, ensure the mailbox entry_size is not too small,
since this can also bypass the above check.

Signed-off-by: Lior David <qca_liord@qca.qualcomm.com>
Signed-off-by: Maya Erez <qca_merez@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
This commit is contained in:
Lior David 2017-11-14 15:25:37 +02:00 committed by Kalle Valo
parent 144a12a6d8
commit 26a6d52748
2 changed files with 22 additions and 2 deletions
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22
drivers/net/wireless/ath/wil6210/interrupt.c
View File

@ -358,6 +358,25 @@ static void wil_cache_mbox_regs(struct wil6210_priv *wil)
wil_mbox_ring_le2cpus(&wil->mbox_ctl.tx);
}
static bool wil_validate_mbox_regs(struct wil6210_priv *wil)
{
size_t min_size = sizeof(struct wil6210_mbox_hdr) +
sizeof(struct wmi_cmd_hdr);
if (wil->mbox_ctl.rx.entry_size < min_size) {
wil_err(wil, "rx mbox entry too small (%d)\n",
wil->mbox_ctl.rx.entry_size);
return false;
}
if (wil->mbox_ctl.tx.entry_size < min_size) {
wil_err(wil, "tx mbox entry too small (%d)\n",
wil->mbox_ctl.tx.entry_size);
return false;
}
return true;
}
static irqreturn_t wil6210_irq_misc(int irq, void *cookie)
{
struct wil6210_priv *wil = cookie;
@ -393,7 +412,8 @@ static irqreturn_t wil6210_irq_misc(int irq, void *cookie)
if (isr & ISR_MISC_FW_READY) {
wil_dbg_irq(wil, "IRQ: FW ready\n");
wil_cache_mbox_regs(wil);
set_bit(wil_status_mbox_ready, wil->status);
if (wil_validate_mbox_regs(wil))
set_bit(wil_status_mbox_ready, wil->status);
/**
* Actual FW ready indicated by the
* WMI_FW_READY_EVENTID

2
drivers/net/wireless/ath/wil6210/wmi.c
View File

@ -448,7 +448,7 @@ static int __wmi_send(struct wil6210_priv *wil, u16 cmdid, void *buf, u16 len)
uint retry;
int rc = 0;
if (sizeof(cmd) + len > r->entry_size) {
if (len > r->entry_size - sizeof(cmd)) {
wil_err(wil, "WMI size too large: %d bytes, max is %d\n",
(int)(sizeof(cmd) + len), r->entry_size);
return -ERANGE;