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| author | Jan Engelhardt <jengelh@medozas.de> | 2011-03-02 12:10:13 +0100 |
|---|---|---|
| committer | Patrick McHardy <kaber@trash.net> | 2011-03-02 12:10:13 +0100 |
| commit | 9ef0298a8e5730d9a46d640014c727f3b4152870 (patch) | |
| tree | d5c676b9a9c79bc29cf1af6b8a56a471177993a6 | |
| parent | ff75f40f44ae9b79d520bf32a05d35af74a805c0 (diff) | |
| download | linux-stable-9ef0298a8e5730d9a46d640014c727f3b4152870.tar.gz linux-stable-9ef0298a8e5730d9a46d640014c727f3b4152870.tar.bz2 linux-stable-9ef0298a8e5730d9a46d640014c727f3b4152870.zip | |
netfilter: nf_log: avoid oops in (un)bind with invalid nfproto values
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@gmail.com>,
via irc.freenode.net/#netfilter
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
| -rw-r--r-- | 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 b07393eab88e..91816998ed86 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); |