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Fix dst_neigh_lookup/dst_neigh_lookup_skb return value handling bug

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When neighbour table is full, dst_neigh_lookup/dst_neigh_lookup_skb will return
-ENOBUFS which is absolutely non zero, while all the code in kernel which use
above functions assume failure only on zero return which will cause panic. (for
example: : https://bugzilla.kernel.org/show_bug.cgi?id=54731).

This patch corrects above error with smallest changes to kernel source code and
also correct two return value check missing bugs in drivers/infiniband/hw/cxgb4/cm.c

Tested on my x86_64 SMP machine

Reported-by: Zhouyi Zhou <zhouzhouyi@gmail.com>
Tested-by: Zhouyi Zhou <zhouzhouyi@gmail.com>
Signed-off-by: Zhouyi Zhou <zhouzhouyi@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Zhouyi Zhou 2013-03-14 17:21:50 +00:00 • committed by David S. Miller
parent 1e731cb986
commit aaa0c23cb9
2 changed files with 16 additions and 2 deletions
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12
drivers/infiniband/hw/cxgb4/cm.c
View file

@ -1575,6 +1575,12 @@ static int c4iw_reconnect(struct c4iw_ep *ep)
neigh = dst_neigh_lookup(ep->dst, neigh = dst_neigh_lookup(ep->dst,
&ep->com.cm_id->remote_addr.sin_addr.s_addr); &ep->com.cm_id->remote_addr.sin_addr.s_addr);
if (!neigh) {
pr_err("%s - cannot alloc neigh.\n", __func__);
err = -ENOMEM;
goto fail4;
}
/* get a l2t entry */ /* get a l2t entry */
if (neigh->dev->flags & IFF_LOOPBACK) { if (neigh->dev->flags & IFF_LOOPBACK) {
PDBG("%s LOOPBACK\n", __func__); PDBG("%s LOOPBACK\n", __func__);
@ -3053,6 +3059,12 @@ static int rx_pkt(struct c4iw_dev *dev, struct sk_buff *skb)
dst = &rt->dst; dst = &rt->dst;
neigh = dst_neigh_lookup_skb(dst, skb); neigh = dst_neigh_lookup_skb(dst, skb);
if (!neigh) {
pr_err("%s - failed to allocate neigh!\n",
__func__);
goto free_dst;
}
if (neigh->dev->flags & IFF_LOOPBACK) { if (neigh->dev->flags & IFF_LOOPBACK) {
pdev = ip_dev_find(&init_net, iph->daddr); pdev = ip_dev_find(&init_net, iph->daddr);
e = cxgb4_l2t_get(dev->rdev.lldi.l2t, neigh, e = cxgb4_l2t_get(dev->rdev.lldi.l2t, neigh,

6
include/net/dst.h
View file

@ -413,13 +413,15 @@ static inline int dst_neigh_output(struct dst_entry *dst, struct neighbour *n,
static inline struct neighbour *dst_neigh_lookup(const struct dst_entry *dst, const void *daddr) static inline struct neighbour *dst_neigh_lookup(const struct dst_entry *dst, const void *daddr)
{ {
return dst->ops->neigh_lookup(dst, NULL, daddr); struct neighbour *n = dst->ops->neigh_lookup(dst, NULL, daddr);
return IS_ERR(n) ? NULL : n;
} }
static inline struct neighbour *dst_neigh_lookup_skb(const struct dst_entry *dst, static inline struct neighbour *dst_neigh_lookup_skb(const struct dst_entry *dst,
struct sk_buff *skb) struct sk_buff *skb)
{ {
return dst->ops->neigh_lookup(dst, skb, NULL); struct neighbour *n = dst->ops->neigh_lookup(dst, skb, NULL);
return IS_ERR(n) ? NULL : n;
} }
static inline void dst_link_failure(struct sk_buff *skb) static inline void dst_link_failure(struct sk_buff *skb)