xsk_getsockopt() is copying uninitialized stack memory to userspace when
`extra_stats` is `false`. Fix it by initializing `stats` with memset().
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 8aa5a33578e9 ("xsk: Add new statistics")
Suggested-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Peilin Ye <yepeilin.cs@xxxxxxxxx>
---
net/xdp/xsk.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 26e3bba8c204..acf001908a0d 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -844,6 +844,8 @@ static int xsk_getsockopt(struct socket *sock, int level, int optname,
bool extra_stats = true;
size_t stats_size;
+ memset(&stats, 0, sizeof(stats));
+
if (len < sizeof(struct xdp_statistics_v1)) {
return -EINVAL;
} else if (len < sizeof(stats)) {
--
2.25.1
