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wifi: nl80211: Add checks for nla_nest_start() in nl80211_send_iface()
author
Yuan Can
<yuancan@huawei.com>
Tue, 29 Nov 2022 01:42:11 +0000
(
01:42
+0000)
committer
Johannes Berg
<johannes.berg@intel.com>
Thu, 1 Dec 2022 12:50:21 +0000
(13:50 +0100)
As the nla_nest_start() may fail with NULL returned, the return value needs
to be checked.
Fixes:
ce08cd344a00
("wifi: nl80211: expose link information for interfaces")
Signed-off-by: Yuan Can <yuancan@huawei.com>
Link:
https://lore.kernel.org/r/20221129014211.56558-1-yuancan@huawei.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
net/wireless/nl80211.c
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diff --git
a/net/wireless/nl80211.c
b/net/wireless/nl80211.c
index
1ad0326
..
33a82ec
100644
(file)
--- a/
net/wireless/nl80211.c
+++ b/
net/wireless/nl80211.c
@@
-3868,6
+3868,9
@@
static int nl80211_send_iface(struct sk_buff *msg, u32 portid, u32 seq, int flag
struct cfg80211_chan_def chandef = {};
int ret;
+ if (!link)
+ goto nla_put_failure;
+
if (nla_put_u8(msg, NL80211_ATTR_MLO_LINK_ID, link_id))
goto nla_put_failure;
if (nla_put(msg, NL80211_ATTR_MAC, ETH_ALEN,