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| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2016-04-29 10:39:34 +0200 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2016-04-29 11:02:33 +0200 |
| commit | 92b4423e3a0bc5d43ecde4bcad871f8b5ba04efd (patch) | |
| tree | fc6db0429c46bab284871df7ef97df9730e7c9b3 /net/ipv4 | |
| parent | 6cd54fc60cc9d307c09bd2675f410c1086050e7d (diff) | |
| download | linux-stable-92b4423e3a0bc5d43ecde4bcad871f8b5ba04efd.tar.gz linux-stable-92b4423e3a0bc5d43ecde4bcad871f8b5ba04efd.tar.bz2 linux-stable-92b4423e3a0bc5d43ecde4bcad871f8b5ba04efd.zip | |
netfilter: fix IS_ERR_VALUE usage
This is a forward-port of the original patch from Andrzej Hajda,
he said:
"IS_ERR_VALUE should be used only with unsigned long type.
Otherwise it can work incorrectly. To achieve this function
xt_percpu_counter_alloc is modified to return unsigned long,
and its result is assigned to temporary variable to perform
error checking, before assigning to .pcnt field.
The patch follows conclusion from discussion on LKML [1][2].
[1]: http://permalink.gmane.org/gmane.linux.kernel/2120927
[2]: http://permalink.gmane.org/gmane.linux.kernel/2150581"
Original patch from Andrzej is here:
http://patchwork.ozlabs.org/patch/582970/
This patch has clashed with input validation fixes for x_tables.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/netfilter/arp_tables.c | 6 | ||||
| -rw-r--r-- | net/ipv4/netfilter/ip_tables.c | 6 |
2 files changed, 8 insertions, 4 deletions
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c index 60f5161abcb4..3355ed72051d 100644 --- a/net/ipv4/netfilter/arp_tables.c +++ b/net/ipv4/netfilter/arp_tables.c @@ -513,11 +513,13 @@ find_check_entry(struct arpt_entry *e, const char *name, unsigned int size) { struct xt_entry_target *t; struct xt_target *target; + unsigned long pcnt; int ret; - e->counters.pcnt = xt_percpu_counter_alloc(); - if (IS_ERR_VALUE(e->counters.pcnt)) + pcnt = xt_percpu_counter_alloc(); + if (IS_ERR_VALUE(pcnt)) return -ENOMEM; + e->counters.pcnt = pcnt; t = arpt_get_target(e); target = xt_request_find_target(NFPROTO_ARP, t->u.user.name, diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c index 735d1ee8c1ab..21ccc19e1e6f 100644 --- a/net/ipv4/netfilter/ip_tables.c +++ b/net/ipv4/netfilter/ip_tables.c @@ -656,10 +656,12 @@ find_check_entry(struct ipt_entry *e, struct net *net, const char *name, unsigned int j; struct xt_mtchk_param mtpar; struct xt_entry_match *ematch; + unsigned long pcnt; - e->counters.pcnt = xt_percpu_counter_alloc(); - if (IS_ERR_VALUE(e->counters.pcnt)) + pcnt = xt_percpu_counter_alloc(); + if (IS_ERR_VALUE(pcnt)) return -ENOMEM; + e->counters.pcnt = pcnt; j = 0; mtpar.net = net; |