From: "Jérôme Pouiller" <Jerome.Pouiller@silabs.com>
To: Dan Carpenter <dan.carpenter@oracle.com>
Cc: "devel@driverdev.osuosl.org" <devel@driverdev.osuosl.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"David S . Miller" <davem@davemloft.net>,
Kalle Valo <kvalo@codeaurora.org>
Subject: Re: [PATCH 08/32] staging: wfx: simplify hif_handle_tx_data()
Date: Thu, 2 Apr 2020 14:44:27 +0000
Message-ID: <2302785.6C7ODC2LYm@pc-42> (raw)
In-Reply-To: <20200402131338.GS2001@kadam>
On Thursday 2 April 2020 15:13:39 CEST Dan Carpenter wrote:
> On Wed, Apr 01, 2020 at 01:03:41PM +0200, Jerome Pouiller wrote:
[...]
> This is on the TX side so it's probably okay, but one problem I have
> noticed is that we do this on the RX side as well with checking that
>
> if (skb->len < sizeof(struct hif_msg))
> return -EINVAL;
>
> So we could be reading beyond the end of the skb. If we got really
> unlucky it could lead to an Oops.
>
> regards,
> dan carpenter
>
>
Hello Dan,
The function rx_helper() in bh.c already do some sanity checks received data:
60 WARN(read_len < 4, "corrupted read");
[...]
92 } else {
93 computed_len = round_up(hif->len, 2);
94 }
95 if (computed_len != read_len) {
96 dev_err(wdev->dev, "inconsistent message length: %zu != %zu\n",
97 computed_len, read_len);
98 print_hex_dump(KERN_INFO, "hif: ", DUMP_PREFIX_OFFSET, 16, 1,
99 hif, read_len, true);
100 goto err;
101 }
However, I can improve this code:
- "4" should be replaced by "sizeof(struct hif_msg)" for readability
- hif->len is tested through computed_len, but I am not sure to be able
to prove that it covers all cases
- rx_helper() should recover the error if read_len < 4
I add that on my TODO list.
--
Jérôme Pouiller
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Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-01 11:03 [PATCH 00/32] staging: wfx: rework the Tx queue Jerome Pouiller
2020-04-01 11:03 ` [PATCH 01/32] staging: wfx: add sanity checks to hif_join() Jerome Pouiller
2020-04-02 12:42 ` Dan Carpenter
2020-04-02 16:14 ` Jérôme Pouiller
2020-04-01 11:03 ` [PATCH 02/32] staging: wfx: do not stop mac80211 queueing during tx_policy upload Jerome Pouiller
2020-04-01 11:03 ` [PATCH 03/32] staging: wfx: take advantage of ieee80211_{stop/start}_queues Jerome Pouiller
2020-04-01 11:03 ` [PATCH 04/32] staging: wfx: remove "burst" mechanism Jerome Pouiller
2020-04-02 13:05 ` Dan Carpenter
2020-04-02 14:47 ` Jérôme Pouiller
2020-04-01 11:03 ` [PATCH 05/32] staging: wfx: uniformize queue_id retrieval Jerome Pouiller
2020-04-01 11:03 ` [PATCH 06/32] staging: wfx: drop useless queue_id field Jerome Pouiller
2020-04-01 11:03 ` [PATCH 07/32] staging: wfx: avoid useless wake_up Jerome Pouiller
2020-04-01 11:03 ` [PATCH 08/32] staging: wfx: simplify hif_handle_tx_data() Jerome Pouiller
2020-04-02 13:13 ` Dan Carpenter
2020-04-02 14:44 ` Jérôme Pouiller [this message]
2020-04-01 11:03 ` [PATCH 09/32] staging: wfx: simplify wfx_tx_queues_empty() Jerome Pouiller
2020-04-01 11:03 ` [PATCH 10/32] staging: wfx: drop unused argument in wfx_get_prio_queue() Jerome Pouiller
2020-04-01 11:03 ` [PATCH 11/32] staging: wfx: simplify wfx_tx_queue_mask_get() Jerome Pouiller
2020-04-01 11:03 ` [PATCH 12/32] staging: wfx: drop useless sta_asleep_mask Jerome Pouiller
2020-04-01 11:03 ` [PATCH 13/32] staging: wfx: drop argument tx_allowed_mask since it is constant now Jerome Pouiller
2020-04-01 11:03 ` [PATCH 14/32] staging: wfx: do not use link_map_cache to track CAB Jerome Pouiller
2020-04-01 11:03 ` [PATCH 15/32] staging: wfx: drop useless link_map_cache Jerome Pouiller
2020-04-01 11:03 ` [PATCH 16/32] staging: wfx: do not rely anymore on link_id to choose packet in queue Jerome Pouiller
2020-04-01 11:03 ` [PATCH 17/32] staging: wfx: drop unused link_id field Jerome Pouiller
2020-04-01 11:03 ` [PATCH 18/32] staging: wfx: drop unused raw_link_id field Jerome Pouiller
2020-04-01 11:03 ` [PATCH 19/32] staging: wfx: rename wfx_tx_get_raw_link_id() Jerome Pouiller
2020-04-01 11:03 ` [PATCH 20/32] staging: wfx: replace wfx_tx_queues_get_after_dtim() by wfx_tx_queues_has_cab() Jerome Pouiller
2020-04-01 11:03 ` [PATCH 21/32] staging: wfx: introduce a counter of pending frames Jerome Pouiller
2020-04-01 11:03 ` [PATCH 22/32] staging: wfx: change the way to choose frame to send Jerome Pouiller
2020-04-01 11:03 ` [PATCH 23/32] staging: wfx: drop now useless field edca_params Jerome Pouiller
2020-04-01 11:03 ` [PATCH 24/32] staging: wfx: drop struct wfx_queue_stats Jerome Pouiller
2020-04-01 11:03 ` [PATCH 25/32] staging: wfx: simplify usage of wfx_tx_queues_put() Jerome Pouiller
2020-04-01 11:03 ` [PATCH 26/32] staging: wfx: improve interface between data_tx.c and queue.c Jerome Pouiller
2020-04-01 11:04 ` [PATCH 27/32] staging: wfx: relocate wfx_skb_dtor() prior its callers Jerome Pouiller
2020-04-01 11:04 ` [PATCH 28/32] staging: wfx: repair wfx_flush() Jerome Pouiller
2020-04-01 11:04 ` [PATCH 29/32] staging: wfx: wfx_flush() did not ensure that frames are processed Jerome Pouiller
2020-04-01 11:04 ` [PATCH 30/32] staging: wfx: fix potential deadlock in wfx_tx_flush() Jerome Pouiller
2020-04-01 11:04 ` [PATCH 31/32] staging: wfx: fix case where AP stop with CAB traffic pending Jerome Pouiller
2020-04-01 11:04 ` [PATCH 32/32] staging: wfx: remove hack about tx_rate policies Jerome Pouiller
2020-04-03 8:03 ` [PATCH 00/32] staging: wfx: rework the Tx queue Dan Carpenter
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