Messages in this thread Patch in this message | | | From | Johan Hovold <> | Subject | [PATCH v2 2/3] ath6kl: fix division by zero in send path | Date | Wed, 27 Oct 2021 10:08:18 +0200 |
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Add the missing endpoint max-packet sanity check to probe() to avoid division by zero in ath10k_usb_hif_tx_sg() in case a malicious device has broken descriptors (or when doing descriptor fuzz testing).
Note that USB core will reject URBs submitted for endpoints with zero wMaxPacketSize but that drivers doing packet-size calculations still need to handle this (cf. commit 2548288b4fb0 ("USB: Fix: Don't skip endpoint descriptors with maxpacket=0")).
Fixes: 9cbee358687e ("ath6kl: add full USB support") Cc: stable@vger.kernel.org # 3.5 Signed-off-by: Johan Hovold <johan@kernel.org> --- drivers/net/wireless/ath/ath6kl/usb.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/net/wireless/ath/ath6kl/usb.c b/drivers/net/wireless/ath/ath6kl/usb.c index bd367b79a4d3..aba70f35e574 100644 --- a/drivers/net/wireless/ath/ath6kl/usb.c +++ b/drivers/net/wireless/ath/ath6kl/usb.c @@ -340,6 +340,11 @@ static int ath6kl_usb_setup_pipe_resources(struct ath6kl_usb *ar_usb) le16_to_cpu(endpoint->wMaxPacketSize), endpoint->bInterval); } + + /* Ignore broken descriptors. */ + if (usb_endpoint_maxp(endpoint) == 0) + continue; + urbcount = 0; pipe_num = -- 2.32.0
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