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ath10k: fix division by zero in send path

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commit a006acb931 upstream.

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 2548288b4f ("USB: Fix: Don't skip
endpoint descriptors with maxpacket=0")).

Fixes: 4db66499df ("ath10k: add initial USB support")
Cc: stable@vger.kernel.org      # 4.14
Cc: Erik Stromdahl <erik.stromdahl@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20211027080819.6675-2-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2021-10-27 10:08:17 +02:00 committed by Greg Kroah-Hartman
parent 2b94d10056
commit 3110371c7a
1 changed files with 5 additions and 0 deletions
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5
drivers/net/wireless/ath/ath10k/usb.c
View file

@ -865,6 +865,11 @@ static int ath10k_usb_setup_pipe_resources(struct ath10k *ar,
le16_to_cpu(endpoint->wMaxPacketSize),
endpoint->bInterval);
}
/* Ignore broken descriptors. */
if (usb_endpoint_maxp(endpoint) == 0)
continue;
urbcount = 0;
pipe_num =