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Date: Mon, 12 Mar 2007 14:15:16 +0200 (EET)
From: Pekka J Enberg <penberg@...helsinki.fi>
To: David Miller <davem@...emloft.net>
cc: amit2030@...il.com, linux-kernel@...r.kernel.org, akpm@...l.org,
netdev@...r.kernel.org
Subject: Re: [PATCH] [REVISED] net/ipv4/multipath_wrandom.c: check kmalloc()
return value.
On 3/9/07, David Miller <davem@...emloft.net> wrote:
> The whole cahce-multipath subsystem has to have it's guts revamped for
> proper error handling.
(Untested patch follows.)
From: Amit Choudhary <amit2030@...il.com>
Check the return value of kmalloc() in function wrandom_set_nhinfo(),
in file net/ipv4/multipath_wrandom.c.
[penberg@...helsinki.fi: return error status to caller.]
Signed-off-by: Amit Choudhary <amit2030@...il.com>
Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>
---
include/net/ip_mp_alg.h | 8 +++++---
net/ipv4/multipath_wrandom.c | 19 +++++++++++++++----
net/ipv4/route.c | 9 +++++++--
3 files changed, 27 insertions(+), 9 deletions(-)
Index: 2.6/include/net/ip_mp_alg.h
===================================================================
--- 2.6.orig/include/net/ip_mp_alg.h 2007-03-12 14:00:13.000000000 +0200
+++ 2.6/include/net/ip_mp_alg.h 2007-03-12 14:03:10.000000000 +0200
@@ -17,7 +17,7 @@ struct ip_mp_alg_ops {
void (*mp_alg_select_route)(const struct flowi *flp,
struct rtable *rth, struct rtable **rp);
void (*mp_alg_flush)(void);
- void (*mp_alg_set_nhinfo)(__be32 network, __be32 netmask,
+ int (*mp_alg_set_nhinfo)(__be32 network, __be32 netmask,
unsigned char prefixlen,
const struct fib_nh *nh);
void (*mp_alg_remove)(struct rtable *rth);
@@ -58,17 +58,19 @@ static inline void multipath_flush(void)
#endif
}
-static inline void multipath_set_nhinfo(struct rtable *rth,
+static inline int multipath_set_nhinfo(struct rtable *rth,
__be32 network, __be32 netmask,
unsigned char prefixlen,
const struct fib_nh *nh)
{
+ int err = 0;
#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
struct ip_mp_alg_ops *ops = ip_mp_alg_table[rth->rt_multipath_alg];
if (ops && ops->mp_alg_set_nhinfo)
- ops->mp_alg_set_nhinfo(network, netmask, prefixlen, nh);
+ err = ops->mp_alg_set_nhinfo(network, netmask, prefixlen, nh);
#endif
+ return err;
}
static inline void multipath_remove(struct rtable *rth)
Index: 2.6/net/ipv4/multipath_wrandom.c
===================================================================
--- 2.6.orig/net/ipv4/multipath_wrandom.c 2007-03-12 14:00:33.000000000 +0200
+++ 2.6/net/ipv4/multipath_wrandom.c 2007-03-12 14:02:17.000000000 +0200
@@ -216,14 +216,15 @@ last_power = 0;
*rp = decision;
}
-static void wrandom_set_nhinfo(__be32 network,
- __be32 netmask,
- unsigned char prefixlen,
- const struct fib_nh *nh)
+static int wrandom_set_nhinfo(__be32 network,
+ __be32 netmask,
+ unsigned char prefixlen,
+ const struct fib_nh *nh)
{
const int state_idx = nh->nh_oif % MULTIPATH_STATE_SIZE;
struct multipath_route *r, *target_route = NULL;
struct multipath_dest *d, *target_dest = NULL;
+ int err = 0;
/* store the weight information for a certain route */
spin_lock_bh(&state[state_idx].lock);
@@ -240,6 +241,10 @@ static void wrandom_set_nhinfo(__be32 ne
const size_t size_rt = sizeof(struct multipath_route);
target_route = (struct multipath_route *)
kmalloc(size_rt, GFP_ATOMIC);
+ if (!target_route) {
+ err = -ENOMEM;
+ goto error;
+ }
target_route->gw = nh->nh_gw;
target_route->oif = nh->nh_oif;
@@ -262,6 +267,10 @@ memset(&target_route->rcu, 0, sizeof(s
target_dest = (struct multipath_dest*)
kmalloc(size_dst, GFP_ATOMIC);
+ if (!target_dest) {
+ err = -ENOMEM;
+ goto error;
+ }
target_dest->nh_info = nh;
target_dest->network = network;
target_dest->netmask = netmask;
@@ -275,6 +284,8 @@ memset(&target_dest->rcu, 0, sizeof(st
*/
spin_unlock_bh(&state[state_idx].lock);
+ error:
+ return err;
}
static void __multipath_free(struct rcu_head *head)
Index: 2.6/net/ipv4/route.c
===================================================================
--- 2.6.orig/net/ipv4/route.c 2007-03-12 14:03:24.000000000 +0200
+++ 2.6/net/ipv4/route.c 2007-03-12 14:04:16.000000000 +0200
@@ -1880,11 +1880,13 @@ for (hop = 0; hop < hopcount; hop++) {
return err;
/* forward hop information to multipath impl. */
- multipath_set_nhinfo(rth,
+ err = multipath_set_nhinfo(rth,
FIB_RES_NETWORK(*res),
FIB_RES_NETMASK(*res),
res->prefixlen,
&FIB_RES_NH(*res));
+ if (err)
+ return err;
}
skb->dst = &rtres->u.dst;
return err;
@@ -2334,8 +2336,11 @@ if (err != 0)
oldflp->oif);
err = rt_intern_hash(hash, rth, rp);
+ if (err != 0)
+ goto cleanup;
+
/* forward hop information to multipath impl. */
- multipath_set_nhinfo(rth,
+ err = multipath_set_nhinfo(rth,
FIB_RES_NETWORK(*res),
FIB_RES_NETMASK(*res),
res->prefixlen,
-
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