Subject: Re: [PATCH] [net] Fix memory leak in htc_connect_service

From: Kalle Valo <[email-masked]>
Date: Fri, 05 May 2023 11:57:39 +0300

Takeshi Misawa <[email-masked]> writes:

> Timeout occurs in htc_connect_service(), then this function returns
> without freeing skb.
>
> Fix this by going to err path.
>
> syzbot report:
> https://syzkaller.appspot.com/bug?id=fbf138952d6c1115ba7d797cf7d56f6935184e3f
> BUG: memory leak
> unreferenced object 0xffff88810a980800 (size 240):
>   comm "kworker/1:1", pid 24, jiffies 4294947427 (age 16.220s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>   backtrace:
>     [<ffffffff83b971c6>] __alloc_skb+0x206/0x270 net/core/skbuff.c:552
>     [<ffffffff82eb3731>] alloc_skb include/linux/skbuff.h:1270 [inline]
>     [<ffffffff82eb3731>] htc_connect_service+0x121/0x230 drivers/net/wireless/ath/ath9k/htc_hst.c:259
>     [<ffffffff82ec03a5>] ath9k_htc_connect_svc drivers/net/wireless/ath/ath9k/htc_drv_init.c:137 [inline]
>     [<ffffffff82ec03a5>] ath9k_init_htc_services.constprop.0+0xe5/0x390 drivers/net/wireless/ath/ath9k/htc_drv_init.c:157
>     [<ffffffff82ec0747>] ath9k_htc_probe_device+0xf7/0x8a0 drivers/net/wireless/ath/ath9k/htc_drv_init.c:959
>     [<ffffffff82eb3ef5>] ath9k_htc_hw_init+0x35/0x60 drivers/net/wireless/ath/ath9k/htc_hst.c:521
>     [<ffffffff82eb68dd>] ath9k_hif_usb_firmware_cb+0xcd/0x1f0 drivers/net/wireless/ath/ath9k/hif_usb.c:1243
>     [<ffffffff82aa835b>] request_firmware_work_func+0x4b/0x90 drivers/base/firmware_loader/main.c:1107
>     [<ffffffff8129a35a>] process_one_work+0x2ba/0x5f0 kernel/workqueue.c:2289
>     [<ffffffff8129ac7d>] worker_thread+0x5d/0x5b0 kernel/workqueue.c:2436
>     [<ffffffff812a4fa9>] kthread+0x129/0x170 kernel/kthread.c:376
>     [<ffffffff81002dcf>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
>
> Fixes: fb9987d0f748 ("ath9k_htc: Support for AR9271 chipset.")
> Reported-and-tested-by: [email-masked]
> Signed-off-by: Takeshi Misawa <[email-masked]>
> ---
>  drivers/net/wireless/ath/ath9k/htc_hst.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

The title should begin with "wifi: ath9k:", see more info from the wiki
link below.

Also ath9k patches go to ath-next, not to the net tree.

-- 
https://patchwork.kernel.org/project/linux-wireless/list/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches