Patch "wifi: nl80211: Add checks for nla_nest_start() in nl80211_send_iface()" has been added to the 6.1-stable tree

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This is a note to let you know that I've just added the patch titled

    wifi: nl80211: Add checks for nla_nest_start() in nl80211_send_iface()

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     wifi-nl80211-add-checks-for-nla_nest_start-in-nl8021.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 3d8f3001b3609ab79106762cba1fd459ef6ca38a
Author: Yuan Can <yuancan@xxxxxxxxxx>
Date:   Tue Nov 29 01:42:11 2022 +0000

    wifi: nl80211: Add checks for nla_nest_start() in nl80211_send_iface()
    
    [ Upstream commit 5cc58b376675981386c6192405fe887cd29c527a ]
    
    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@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20221129014211.56558-1-yuancan@xxxxxxxxxx
    Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 597c52236514..d2321c683398 100644
--- 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,



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