Patch "wifi: mac80211: mesh: check element parsing succeeded" has been added to the 6.6-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

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

    wifi: mac80211: mesh: check element parsing succeeded

to the 6.6-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-mac80211-mesh-check-element-parsing-succeeded.patch
and it can be found in the queue-6.6 subdirectory.

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



commit 296b8a010a62ae0ac012ef39c762d6278b6b9138
Author: Johannes Berg <johannes.berg@xxxxxxxxx>
Date:   Mon Dec 11 09:05:32 2023 +0200

    wifi: mac80211: mesh: check element parsing succeeded
    
    [ Upstream commit 1fc4a3eec50d726f4663ad3c0bb0158354d6647a ]
    
    ieee802_11_parse_elems() can return NULL, so we must
    check for the return value.
    
    Fixes: 5d24828d05f3 ("mac80211: always allocate struct ieee802_11_elems")
    Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
    Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@xxxxxxxxx>
    Link: https://msgid.link/20231211085121.93dea364f3d3.Ie87781c6c48979fb25a744b90af4a33dc2d83a28@changeid
    Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/net/mac80211/mesh_plink.c b/net/mac80211/mesh_plink.c
index a1e526419e9d2..5c8a3ff0ae0cc 100644
--- a/net/mac80211/mesh_plink.c
+++ b/net/mac80211/mesh_plink.c
@@ -1243,6 +1243,8 @@ void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
 			return;
 	}
 	elems = ieee802_11_parse_elems(baseaddr, len - baselen, true, NULL);
-	mesh_process_plink_frame(sdata, mgmt, elems, rx_status);
-	kfree(elems);
+	if (elems) {
+		mesh_process_plink_frame(sdata, mgmt, elems, rx_status);
+		kfree(elems);
+	}
 }