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Date: Wed, 2 Mar 2011 12:56:21 +0100 From: kaber@...sh.net To: davem@...emloft.net Cc: netfilter-devel@...r.kernel.org, netdev@...r.kernel.org Subject: [PATCH 2/2] netfilter: nf_log: avoid oops in (un)bind with invalid nfproto values From: Jan Engelhardt <jengelh@...ozas.de> Like many other places, we have to check that the array index is within allowed limits, or otherwise, a kernel oops and other nastiness can ensue when we access memory beyond the end of the array. [ 5954.115381] BUG: unable to handle kernel paging request at 0000004000000000 [ 5954.120014] IP: __find_logger+0x6f/0xa0 [ 5954.123979] nf_log_bind_pf+0x2b/0x70 [ 5954.123979] nfulnl_recv_config+0xc0/0x4a0 [nfnetlink_log] [ 5954.123979] nfnetlink_rcv_msg+0x12c/0x1b0 [nfnetlink] ... The problem goes back to v2.6.30-rc1~1372~1342~31 where nf_log_bind was decoupled from nf_log_register. Reported-by: Miguel Di Ciurcio Filho <miguel.filho@...il.com>, via irc.freenode.net/#netfilter Signed-off-by: Jan Engelhardt <jengelh@...ozas.de> Signed-off-by: Patrick McHardy <kaber@...sh.net> --- net/netfilter/nf_log.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c index b07393e..9181699 100644 --- a/net/netfilter/nf_log.c +++ b/net/netfilter/nf_log.c @@ -85,6 +85,8 @@ EXPORT_SYMBOL(nf_log_unregister); int nf_log_bind_pf(u_int8_t pf, const struct nf_logger *logger) { + if (pf >= ARRAY_SIZE(nf_loggers)) + return -EINVAL; mutex_lock(&nf_log_mutex); if (__find_logger(pf, logger->name) == NULL) { mutex_unlock(&nf_log_mutex); @@ -98,6 +100,8 @@ EXPORT_SYMBOL(nf_log_bind_pf); void nf_log_unbind_pf(u_int8_t pf) { + if (pf >= ARRAY_SIZE(nf_loggers)) + return; mutex_lock(&nf_log_mutex); rcu_assign_pointer(nf_loggers[pf], NULL); mutex_unlock(&nf_log_mutex); -- 1.7.4 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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