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Subject[PATCH v2] ath9k: ath9k_htc_rx_msg: return when sk_buff is too small
At the start of ath9k_htc_rx_msg, we check to see if the skb pointer is
valid, but what we don't do is check if it is large enough to contain a
valid struct htc_frame_hdr. We should check for this and return if not,
as the buffer is invalid in this case. Fixes a KMSAN-found uninit-value bug
reported by syzbot at:

Signed-off-by: Phillip Potter <>

* Free skb properly when this problem is detected, as pointed out by
Florian Westphal.

drivers/net/wireless/ath/ath9k/htc_hst.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/net/wireless/ath/ath9k/htc_hst.c b/drivers/net/wireless/ath/ath9k/htc_hst.c
index 510e61e97dbc..1fe89b068ac4 100644
--- a/drivers/net/wireless/ath/ath9k/htc_hst.c
+++ b/drivers/net/wireless/ath/ath9k/htc_hst.c
@@ -406,6 +406,11 @@ void ath9k_htc_rx_msg(struct htc_target *htc_handle,
if (!htc_handle || !skb)

+ if (!pskb_may_pull(skb, sizeof(struct htc_frame_hdr))) {
+ kfree_skb(skb);
+ return;
+ }
htc_hdr = (struct htc_frame_hdr *) skb->data;
epid = htc_hdr->endpoint_id;

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