netdev - Re: [PATCH v3] nfc: virtual_ncidev: Fix memory leak in virtual_nci

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <f5b4aff3-6dd8-1dd1-6a60-c295f8b87f92@linaro.org>
Date:   Thu, 20 Oct 2022 14:18:10 -0400
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Shang XiaoJing <shangxiaojing@...wei.com>, bongsu.jeon@...sung.com,
        kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org
Subject: Re: [PATCH v3] nfc: virtual_ncidev: Fix memory leak in
 virtual_nci_send()

On 19/10/2022 23:05, Shang XiaoJing wrote:
> skb should be free in virtual_nci_send(), otherwise kmemleak will report
> memleak.
> 
> Steps for reproduction (simulated in qemu):
> 	cd tools/testing/selftests/nci
> 	make
> 	./nci_dev
> 
> BUG: memory leak
> unreferenced object 0xffff888107588000 (size 208):
>   comm "nci_dev", pid 206, jiffies 4294945376 (age 368.248s)
>   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:
>     [<000000008d94c8fd>] __alloc_skb+0x1da/0x290
>     [<00000000278bc7f8>] nci_send_cmd+0xa3/0x350
>     [<0000000081256a22>] nci_reset_req+0x6b/0xa0
>     [<000000009e721112>] __nci_request+0x90/0x250
>     [<000000005d556e59>] nci_dev_up+0x217/0x5b0
>     [<00000000e618ce62>] nfc_dev_up+0x114/0x220
>     [<00000000981e226b>] nfc_genl_dev_up+0x94/0xe0
>     [<000000009bb03517>] genl_family_rcv_msg_doit.isra.14+0x228/0x2d0
>     [<00000000b7f8c101>] genl_rcv_msg+0x35c/0x640
>     [<00000000c94075ff>] netlink_rcv_skb+0x11e/0x350
>     [<00000000440cfb1e>] genl_rcv+0x24/0x40
>     [<0000000062593b40>] netlink_unicast+0x43f/0x640
>     [<000000001d0b13cc>] netlink_sendmsg+0x73a/0xbf0
>     [<000000003272487f>] __sys_sendto+0x324/0x370
>     [<00000000ef9f1747>] __x64_sys_sendto+0xdd/0x1b0
>     [<000000001e437841>] do_syscall_64+0x3f/0x90
> 
> Fixes: e624e6c3e777 ("nfc: Add a virtual nci device driver")
> Signed-off-by: Shang XiaoJing <shangxiaojing@...wei.com>
> ---


Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Best regards,
Krzysztof