ath9k: Fix potential out of bounds in ath9k_htc_txcompletion_cb()

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The value of "htc_hdr->endpoint_id" comes from skb->data so Smatch marks
it as untrusted so we have to check it before using it as an array
offset.

This is similar to a bug that syzkaller found in commit e4ff08a4d7
("ath9k: Fix use-after-free Write in ath9k_htc_rx_msg") so it is
probably a real issue.

Fixes: fb9987d0f7 ("ath9k_htc: Support for AR9271 chipset.")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200813141253.GA457408@mwanda

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Dan Carpenter 2020-08-13 17:12:53 +03:00 • committed by Kalle Valo

parent 5024f21c15

commit 2705cd7558

1 changed files with 2 additions and 0 deletions

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drivers/net/wireless/ath/ath9k/htc_hst.c

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