netfilter: x_tables: fix int overflow in xt_alloc_table_info()

commit 889c604fd0b5f6d3b8694ade229ee44124de1127 upstream.

syzkaller triggered OOM kills by passing ipt_replace.size = -1
to IPT_SO_SET_REPLACE. The root cause is that SMP_ALIGN() in
xt_alloc_table_info() causes int overflow and the size check passes
when it should not. SMP_ALIGN() is no longer needed leftover.

Remove SMP_ALIGN() call in xt_alloc_table_info().

Reported-by: syzbot+4396883fa8c4f64e0175@syzkaller.appspotmail.com
Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index 7b42b0ad3f9bb6dd859416843f1cceb8cc144ac5..bd97acd8979e9fc95295c0df2acda239437c2569 100644 (file)
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -38,8 +38,6 @@ MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
 MODULE_DESCRIPTION("{ip,ip6,arp,eb}_tables backend module");
 
-#define SMP_ALIGN(x) (((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1))
-
 struct compat_delta {
        unsigned int offset; /* offset in kernel */
        int delta; /* delta in 32bit user land */
@@ -954,7 +952,7 @@ struct xt_table_info *xt_alloc_table_info(unsigned int size)
                return NULL;
 
        /* Pedantry: prevent them from hitting BUG() in vmalloc.c --RR */
-       if ((SMP_ALIGN(size) >> PAGE_SHIFT) + 2 > totalram_pages)
+       if ((size >> PAGE_SHIFT) + 2 > totalram_pages)
                return NULL;
 
        if (sz <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER))