We should check whether the NFTA_INNER_NUM netlink attribute is present
before accessing it, otherwise a null pointer deference error will occur.
Call Trace:
dump_stack_lvl+0x4f/0x90
print_report+0x3f0/0x620
kasan_report+0xcd/0x110
__asan_load4+0x84/0xa0
nft_inner_init+0x128/0x2e0
nf_tables_newrule+0x813/0x1230
nfnetlink_rcv_batch+0xec3/0x1170
nfnetlink_rcv+0x1e4/0x220
netlink_unicast+0x34e/0x4b0
netlink_sendmsg+0x45c/0x7e0
__sys_sendto+0x355/0x370
__x64_sys_sendto+0x84/0xa0
do_syscall_64+0x3f/0x90
entry_SYSCALL_64_after_hwframe+0x6e/0xd8
Fixes: 3a07327d10a0 ("netfilter: nft_inner: support for inner tunnel header matching")
Signed-off-by: Xingyuan Mo <hdthky0@xxxxxxxxx>
---
net/netfilter/nft_inner.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/net/netfilter/nft_inner.c b/net/netfilter/nft_inner.c
index 28e2873ba24e..928312d01eb1 100644
--- a/net/netfilter/nft_inner.c
+++ b/net/netfilter/nft_inner.c
@@ -298,6 +298,7 @@ static int nft_inner_init(const struct nft_ctx *ctx,
int err;
if (!tb[NFTA_INNER_FLAGS] ||
+ !tb[NFTA_INNER_NUM] ||
!tb[NFTA_INNER_HDRSIZE] ||
!tb[NFTA_INNER_TYPE] ||
!tb[NFTA_INNER_EXPR])
--
2.25.1
