[PATCH 4.19 05/91] inet_diag: Fix error path to cancel the meseage in inet_req_diag_fill()

Greg Kroah-Hartman
2020-11-23T12:31:11Z

From: Wang Hai <wanghai38@huawei.com>

[ Upstream commit e33de7c5317e2827b2ba6fd120a505e9eb727b05 ]

nlmsg_cancel() needs to be called in the error path of
inet_req_diag_fill to cancel the message.

Fixes: d545caca827b ("net: inet: diag: expose the socket mark to privileged processes.")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wang Hai <wanghai38@huawei.com>
Link: https://lore.kernel.org/r/20201116082018.16496-1-wanghai38@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/ipv4/inet_diag.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -392,8 +392,10 @@ static int inet_req_diag_fill(struct soc
r->idiag_inode = 0;

if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
- inet_rsk(reqsk)->ir_mark))
+ inet_rsk(reqsk)->ir_mark)) {
+ nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
+ }

nlmsg_end(skb, nlh);
return 0;