This is a note to let you know that I've just added the patch titled
wifi: mac80211_hwsim: drop short frames
to the 5.15-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_hwsim-drop-short-frames.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 981c077dbc0a164dbc34d85fb21cfaee2f0de3d9
Author: Johannes Berg <johannes.berg@xxxxxxxxx>
Date: Tue Aug 15 21:28:01 2023 +0200
wifi: mac80211_hwsim: drop short frames
[ Upstream commit fba360a047d5eeeb9d4b7c3a9b1c8308980ce9a6 ]
While technically some control frames like ACK are shorter and
end after Address 1, such frames shouldn't be forwarded through
wmediumd or similar userspace, so require the full 3-address
header to avoid accessing invalid memory if shorter frames are
passed in.
Reported-by: syzbot+b2645b5bf1512b81fa22@xxxxxxxxxxxxxxxxxxxxxxxxx
Reviewed-by: Jeff Johnson <quic_jjohnson@xxxxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index c3c3b5aa87b0d..6eb3c845640bd 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -3693,14 +3693,15 @@ static int hwsim_cloned_frame_received_nl(struct sk_buff *skb_2,
frame_data_len = nla_len(info->attrs[HWSIM_ATTR_FRAME]);
frame_data = (void *)nla_data(info->attrs[HWSIM_ATTR_FRAME]);
+ if (frame_data_len < sizeof(struct ieee80211_hdr_3addr) ||
+ frame_data_len > IEEE80211_MAX_DATA_LEN)
+ goto err;
+
/* Allocate new skb here */
skb = alloc_skb(frame_data_len, GFP_KERNEL);
if (skb == NULL)
goto err;
- if (frame_data_len > IEEE80211_MAX_DATA_LEN)
- goto err;
-
/* Copy the data */
skb_put_data(skb, frame_data, frame_data_len);
