[PATCH 4.14 37/42] nl80211: Handle nla_memdup failures in handle_nan_filter

Greg Kroah-Hartman
2022-03-07T09:24:48Z

From: Jiasheng Jiang <jiasheng@iscas.ac.cn>

[ Upstream commit 6ad27f522cb3b210476daf63ce6ddb6568c0508b ]

As there's potential for failure of the nla_memdup(),
check the return value.

Fixes: a442b761b24b ("cfg80211: add add_nan_func / del_nan_func")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Link: https://lore.kernel.org/r/20220301100020.3801187-1-jiasheng@iscas.ac.cn
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/wireless/nl80211.c | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index f630fa2e3164..bbc3c876a5d8 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -11257,6 +11257,9 @@ static int handle_nan_filter(struct nlattr *attr_filter,
i = 0;
nla_for_each_nested(attr, attr_filter, rem) {
filter[i].filter = nla_memdup(attr, GFP_KERNEL);
+ if (!filter[i].filter)
+ goto err;
+
filter[i].len = nla_len(attr);
i++;
}
@@ -11269,6 +11272,15 @@ static int handle_nan_filter(struct nlattr *attr_filter,
}

return 0;
+
+err:
+ i = 0;
+ nla_for_each_nested(attr, attr_filter, rem) {
+ kfree(filter[i].filter);
+ i++;
+ }
+ kfree(filter);
+ return -ENOMEM;
}

static int nl80211_nan_add_func(struct sk_buff *skb,
--
2.34.1