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Commit 20ed6956 authored by Kai Germaschewski's avatar Kai Germaschewski
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ISDN: MPPP crash fix 

prevent kernel oops with MPPP
add some debugging code for critical MPPP situations

(by Karsten Keil)
parent 2ce4fa29
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Inline Side-by-side
Showing with 107 additions and 36 deletions
drivers/isdn/i4l/isdn_net.h
View file @ 20ed6956
......@@ -128,8 +128,12 @@ static __inline__ void isdn_net_rm_from_bundle(isdn_net_local *lp)
spin_lock_irqsave(&master_lp->netdev->queue_lock, flags);
lp->last->next = lp->next;
lp->next->last = lp->last;
if (master_lp->netdev->queue == lp)
if (master_lp->netdev->queue == lp) {
master_lp->netdev->queue = lp->next;
if (lp->next == lp) { /* last in queue */
master_lp->netdev->queue = master_lp->netdev->local;
}
}
lp->next = lp->last = lp; /* (re)set own pointers */
spin_unlock_irqrestore(&master_lp->netdev->queue_lock, flags);
}
......
drivers/isdn/i4l/isdn_ppp.c
View file @ 20ed6956
......@@ -108,8 +108,11 @@ isdn_ppp_free(isdn_net_local * lp)
unsigned long flags;
struct ippp_struct *is;
if (lp->ppp_slot < 0 || lp->ppp_slot > ISDN_MAX_CHANNELS)
if (lp->ppp_slot < 0 || lp->ppp_slot > ISDN_MAX_CHANNELS) {
printk(KERN_ERR __FUNCTION__": ppp_slot(%d) out of range\n",
lp->ppp_slot);
return 0;
}
save_flags(flags);
cli();
......@@ -125,7 +128,12 @@ isdn_ppp_free(isdn_net_local * lp)
lp->netdev->pb->ref_ct--;
spin_unlock(&lp->netdev->pb->lock);
#endif /* CONFIG_ISDN_MPP */
if (lp->ppp_slot < 0 || lp->ppp_slot > ISDN_MAX_CHANNELS) {
printk(KERN_ERR __FUNCTION__": ppp_slot(%d) now invalid\n",
lp->ppp_slot);
restore_flags(flags);
return 0;
}
is = ippp_table[lp->ppp_slot];
if ((is->state & IPPP_CONNECT))
isdn_ppp_closewait(lp->ppp_slot); /* force wakeup on ippp device */
......@@ -221,11 +229,12 @@ isdn_ppp_bind(isdn_net_local * lp)
void
isdn_ppp_wakeup_daemon(isdn_net_local * lp)
{
if (lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS)
if (lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS) {
printk(KERN_ERR __FUNCTION__": ppp_slot(%d) out of range\n",
lp->ppp_slot);
return;
}
ippp_table[lp->ppp_slot]->state = IPPP_OPEN | IPPP_CONNECT | IPPP_NOBLOCK;
wake_up_interruptible(&ippp_table[lp->ppp_slot]->wq);
}
......@@ -239,13 +248,14 @@ isdn_ppp_closewait(int slot)
{
struct ippp_struct *is;
if (slot < 0 || slot >= ISDN_MAX_CHANNELS)
if (slot < 0 || slot >= ISDN_MAX_CHANNELS) {
printk(KERN_ERR __FUNCTION__": slot(%d) out of range\n",
slot);
return 0;
}
is = ippp_table[slot];
if (is->state)
wake_up_interruptible(&is->wq);
is->state = IPPP_CLOSEWAIT;
return 1;
}
......@@ -339,6 +349,11 @@ isdn_ppp_release(struct inode *ino, struct file *file)
if (is->lp) { /* a lp address says: this link is still up */
isdn_net_dev *p = is->lp->netdev;
if (!p) {
printk(KERN_ERR __FUNCTION__": no lp->netdev\n");
unlock_kernel();
return 0;
}
is->state &= ~IPPP_CONNECT; /* -> effect: no call of wakeup */
/*
* isdn_net_hangup() calls isdn_ppp_free()
......@@ -642,7 +657,7 @@ isdn_ppp_fill_rq(unsigned char *buf, int len, int proto, int slot)
struct ippp_struct *is;
if (slot < 0 || slot >= ISDN_MAX_CHANNELS) {
printk(KERN_WARNING "ippp: illegal slot.\n");
printk(KERN_WARNING "ippp: illegal slot(%d).\n", slot);
return 0;
}
is = ippp_table[slot];
......@@ -964,7 +979,8 @@ void isdn_ppp_receive(isdn_net_dev * net_dev, isdn_net_local * lp, struct sk_buf
slot = lp->ppp_slot;
if (slot < 0 || slot > ISDN_MAX_CHANNELS) {
printk(KERN_ERR "isdn_ppp_receive: lp->ppp_slot %d\n", lp->ppp_slot);
printk(KERN_ERR "isdn_ppp_receive: lp->ppp_slot(%d)\n",
lp->ppp_slot);
kfree_skb(skb);
return;
}
......@@ -1017,7 +1033,8 @@ isdn_ppp_push_higher(isdn_net_dev * net_dev, isdn_net_local * lp, struct sk_buff
slot = lp->ppp_slot;
if (slot < 0 || slot > ISDN_MAX_CHANNELS) {
printk(KERN_ERR "isdn_ppp_push_higher: lp->ppp_slot %d\n", lp->ppp_slot);
printk(KERN_ERR "isdn_ppp_push_higher: lp->ppp_slot(%d)\n",
lp->ppp_slot);
goto drop_packet;
}
is = ippp_table[slot];
......@@ -1025,7 +1042,8 @@ isdn_ppp_push_higher(isdn_net_dev * net_dev, isdn_net_local * lp, struct sk_buff
if (lp->master) { // FIXME?
slot = ((isdn_net_local *) (lp->master->priv))->ppp_slot;
if (slot < 0 || slot > ISDN_MAX_CHANNELS) {
printk(KERN_ERR "isdn_ppp_push_higher: master->ppp_slot %d\n", lp->ppp_slot);
printk(KERN_ERR "isdn_ppp_push_higher: master->ppp_slot(%d)\n",
lp->ppp_slot);
goto drop_packet;
}
}
......@@ -1059,6 +1077,11 @@ isdn_ppp_push_higher(isdn_net_dev * net_dev, isdn_net_local * lp, struct sk_buff
case PPP_VJC_UNCOMP:
if (is->debug & 0x20)
printk(KERN_DEBUG "isdn_ppp: VJC_UNCOMP\n");
if (net_dev->local->ppp_slot < 0) {
printk(KERN_ERR __FUNCTION__": net_dev->local->ppp_slot(%d) out of range\n",
net_dev->local->ppp_slot);
goto drop_packet;
}
if (slhc_remember(ippp_table[net_dev->local->ppp_slot]->slcomp, skb->data, skb->len) <= 0) {
printk(KERN_WARNING "isdn_ppp: received illegal VJC_UNCOMP frame!\n");
goto drop_packet;
......@@ -1080,6 +1103,11 @@ isdn_ppp_push_higher(isdn_net_dev * net_dev, isdn_net_local * lp, struct sk_buff
}
skb_put(skb, skb_old->len + 128);
memcpy(skb->data, skb_old->data, skb_old->len);
if (net_dev->local->ppp_slot < 0) {
printk(KERN_ERR __FUNCTION__": net_dev->local->ppp_slot(%d) out of range\n",
net_dev->local->ppp_slot);
goto drop_packet;
}
pkt_len = slhc_uncompress(ippp_table[net_dev->local->ppp_slot]->slcomp,
skb->data, skb_old->len);
kfree_skb(skb_old);
......@@ -1168,7 +1196,8 @@ isdn_ppp_xmit(struct sk_buff *skb, struct net_device *netdev)
slot = mlp->ppp_slot;
if (slot < 0 || slot > ISDN_MAX_CHANNELS) {
printk(KERN_ERR "isdn_ppp_xmit: lp->ppp_slot %d\n", mlp->ppp_slot);
printk(KERN_ERR "isdn_ppp_xmit: lp->ppp_slot(%d)\n",
mlp->ppp_slot);
kfree_skb(skb);
return 0;
}
......@@ -1203,7 +1232,8 @@ isdn_ppp_xmit(struct sk_buff *skb, struct net_device *netdev)
slot = lp->ppp_slot;
if (slot < 0 || slot > ISDN_MAX_CHANNELS) {
printk(KERN_ERR "isdn_ppp_xmit: lp->ppp_slot %d\n", lp->ppp_slot);
printk(KERN_ERR "isdn_ppp_xmit: lp->ppp_slot(%d)\n",
lp->ppp_slot);
kfree_skb(skb);
return 0;
}
......@@ -1408,8 +1438,15 @@ static ippp_bundle * isdn_ppp_mp_bundle_alloc(void)
static int isdn_ppp_mp_init( isdn_net_local * lp, ippp_bundle * add_to )
{
struct ippp_struct * is = ippp_table[lp->ppp_slot];
struct ippp_struct * is;
if (lp->ppp_slot < 0) {
printk(KERN_ERR __FUNCTION__": lp->ppp_slot(%d) out of range\n",
lp->ppp_slot);
return(-EINVAL);
}
is = ippp_table[lp->ppp_slot];
if (add_to) {
if( lp->netdev->pb )
lp->netdev->pb->ref_ct--;
......@@ -1455,7 +1492,8 @@ static void isdn_ppp_mp_receive(isdn_net_dev * net_dev, isdn_net_local * lp,
stats = &mp->stats;
slot = lp->ppp_slot;
if (slot < 0 || slot > ISDN_MAX_CHANNELS) {
printk(KERN_ERR "isdn_ppp_mp_receive: lp->ppp_slot %d\n", lp->ppp_slot);
printk(KERN_ERR __FUNCTION__": lp->ppp_slot(%d)\n",
lp->ppp_slot);
stats->frame_drops++;
dev_kfree_skb(skb);
spin_unlock_irqrestore(&mp->lock, flags);
......@@ -1491,7 +1529,8 @@ static void isdn_ppp_mp_receive(isdn_net_dev * net_dev, isdn_net_local * lp,
for (lpq = net_dev->queue;;) {
slot = lpq->ppp_slot;
if (slot < 0 || slot > ISDN_MAX_CHANNELS) {
printk(KERN_ERR "isdn_ppp_mp_receive: lpq->ppp_slot %d\n", lpq->ppp_slot);
printk(KERN_ERR __FUNCTION__": lpq->ppp_slot(%d)\n",
lpq->ppp_slot);
} else {
u32 lls = ippp_table[slot]->last_link_seqno;
if (MP_LT(lls, minseq))
......@@ -1723,9 +1762,14 @@ void isdn_ppp_mp_reassembly( isdn_net_dev * net_dev, isdn_net_local * lp,
struct sk_buff * skb;
unsigned int tot_len;
if (lp->ppp_slot < 0 || lp->ppp_slot > ISDN_MAX_CHANNELS) {
printk(KERN_ERR __FUNCTION__": lp->ppp_slot(%d) out of range\n",
lp->ppp_slot);
return;
}
if( MP_FLAGS(from) == (MP_BEGIN_FRAG | MP_END_FRAG) ) {
if( ippp_table[lp->ppp_slot]->debug & 0x40 )
printk(KERN_DEBUG"isdn_mppp: reassembly: frame %d, "
printk(KERN_DEBUG "isdn_mppp: reassembly: frame %d, "
"len %d\n", MP_SEQ(from), from->len );
skb = from;
skb_pull(skb, MP_HEADER_LEN);
......@@ -2487,18 +2531,31 @@ static struct sk_buff *isdn_ppp_compress(struct sk_buff *skb_in,int *proto,
static void isdn_ppp_receive_ccp(isdn_net_dev *net_dev, isdn_net_local *lp,
struct sk_buff *skb,int proto)
{
struct ippp_struct *is = ippp_table[lp->ppp_slot];
struct ippp_struct *is;
struct ippp_struct *mis;
int len;
struct isdn_ppp_resetparams rsparm;
unsigned char rsdata[IPPP_RESET_MAXDATABYTES];
printk(KERN_DEBUG "Received CCP frame from peer\n");
printk(KERN_DEBUG "Received CCP frame from peer slot(%d)\n",
lp->ppp_slot);
if (lp->ppp_slot < 0 || lp->ppp_slot > ISDN_MAX_CHANNELS) {
printk(KERN_ERR __FUNCTION__": lp->ppp_slot(%d) out of range\n",
lp->ppp_slot);
return;
}
is = ippp_table[lp->ppp_slot];
isdn_ppp_frame_log("ccp-rcv", skb->data, skb->len, 32, is->unit,lp->ppp_slot);
if(lp->master)
mis = ippp_table[((isdn_net_local *) (lp->master->priv))->ppp_slot];
else
if(lp->master) {
int slot = ((isdn_net_local *) (lp->master->priv))->ppp_slot;
if (slot < 0 || slot > ISDN_MAX_CHANNELS) {
printk(KERN_ERR __FUNCTION__": slot(%d) out of range\n",
slot);
return;
}
mis = ippp_table[slot];
} else
mis = is;
switch(skb->data[0]) {
......@@ -2650,13 +2707,18 @@ static void isdn_ppp_receive_ccp(isdn_net_dev *net_dev, isdn_net_local *lp,
static void isdn_ppp_send_ccp(isdn_net_dev *net_dev, isdn_net_local *lp, struct sk_buff *skb)
{
struct ippp_struct *mis,*is = ippp_table[lp->ppp_slot];
int proto;
struct ippp_struct *mis,*is;
int proto, slot = lp->ppp_slot;
unsigned char *data;
if(!skb || skb->len < 3)
return;
if (slot < 0 || slot > ISDN_MAX_CHANNELS) {
printk(KERN_ERR __FUNCTION__": lp->ppp_slot(%d) out of range\n",
slot);
return;
}
is = ippp_table[slot];
/* Daemon may send with or without address and control field comp */
data = skb->data;
if(!(is->pppcfg & SC_COMP_AC) && data[0] == 0xff && data[1] == 0x03) {
......@@ -2672,12 +2734,17 @@ static void isdn_ppp_send_ccp(isdn_net_dev *net_dev, isdn_net_local *lp, struct
printk(KERN_DEBUG "Received CCP frame from daemon:\n");
isdn_ppp_frame_log("ccp-xmit", skb->data, skb->len, 32, is->unit,lp->ppp_slot);
if(lp->master)
mis = ippp_table[((isdn_net_local *) (lp->master->priv))->ppp_slot];
else
if (lp->master) {
slot = ((isdn_net_local *) (lp->master->priv))->ppp_slot;
if (slot < 0 || slot > ISDN_MAX_CHANNELS) {
printk(KERN_ERR __FUNCTION__": slot(%d) out of range\n",
slot);
return;
}
mis = ippp_table[slot];
} else
mis = is;
if(mis != is)
if (mis != is)
printk(KERN_DEBUG "isdn_ppp: Ouch! Master CCP sends on slave slot!\n");
switch(data[2]) {
......
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