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arcnet: provide a buffer big enough to actually receive packets

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struct archdr is only big enough to hold the header of various types of
arcnet packets. So to provide enough space to hold the data read from
hardware provide a buffer large enough to hold a packet with maximal
size.

The problem was noticed by the stack protector which makes the kernel
oops.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Uwe Kleine-König 2019-09-20 16:08:21 +02:00 committed by David S. Miller
parent 0edc3f703f
commit 02a0704683
1 changed files with 17 additions and 14 deletions
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31
drivers/net/arcnet/arcnet.c
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@ -1063,31 +1063,34 @@ EXPORT_SYMBOL(arcnet_interrupt);
static void arcnet_rx(struct net_device *dev, int bufnum)
{
struct arcnet_local *lp = netdev_priv(dev);
struct archdr pkt;
union {
struct archdr pkt;
char buf[512];
} rxdata;
struct arc_rfc1201 *soft;
int length, ofs;
soft = &pkt.soft.rfc1201;
soft = &rxdata.pkt.soft.rfc1201;
lp->hw.copy_from_card(dev, bufnum, 0, &pkt, ARC_HDR_SIZE);
if (pkt.hard.offset[0]) {
ofs = pkt.hard.offset[0];
lp->hw.copy_from_card(dev, bufnum, 0, &rxdata.pkt, ARC_HDR_SIZE);
if (rxdata.pkt.hard.offset[0]) {
ofs = rxdata.pkt.hard.offset[0];
length = 256 - ofs;
} else {
ofs = pkt.hard.offset[1];
ofs = rxdata.pkt.hard.offset[1];
length = 512 - ofs;
}
/* get the full header, if possible */
if (sizeof(pkt.soft) <= length) {
lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(pkt.soft));
if (sizeof(rxdata.pkt.soft) <= length) {
lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(rxdata.pkt.soft));
} else {
memset(&pkt.soft, 0, sizeof(pkt.soft));
memset(&rxdata.pkt.soft, 0, sizeof(rxdata.pkt.soft));
lp->hw.copy_from_card(dev, bufnum, ofs, soft, length);
}
arc_printk(D_DURING, dev, "Buffer #%d: received packet from %02Xh to %02Xh (%d+4 bytes)\n",
bufnum, pkt.hard.source, pkt.hard.dest, length);
bufnum, rxdata.pkt.hard.source, rxdata.pkt.hard.dest, length);
dev->stats.rx_packets++;
dev->stats.rx_bytes += length + ARC_HDR_SIZE;
@ -1096,13 +1099,13 @@ static void arcnet_rx(struct net_device *dev, int bufnum)
if (arc_proto_map[soft->proto]->is_ip) {
if (BUGLVL(D_PROTO)) {
struct ArcProto
*oldp = arc_proto_map[lp->default_proto[pkt.hard.source]],
*oldp = arc_proto_map[lp->default_proto[rxdata.pkt.hard.source]],
*newp = arc_proto_map[soft->proto];
if (oldp != newp) {
arc_printk(D_PROTO, dev,
"got protocol %02Xh; encap for host %02Xh is now '%c' (was '%c')\n",
soft->proto, pkt.hard.source,
soft->proto, rxdata.pkt.hard.source,
newp->suffix, oldp->suffix);
}
}
@ -1111,10 +1114,10 @@ static void arcnet_rx(struct net_device *dev, int bufnum)
lp->default_proto[0] = soft->proto;
/* in striking contrast, the following isn't a hack. */
lp->default_proto[pkt.hard.source] = soft->proto;
lp->default_proto[rxdata.pkt.hard.source] = soft->proto;
}
/* call the protocol-specific receiver. */
arc_proto_map[soft->proto]->rx(dev, bufnum, &pkt, length);
arc_proto_map[soft->proto]->rx(dev, bufnum, &rxdata.pkt, length);
}
static void null_rx(struct net_device *dev, int bufnum,