* [PATCH v3] nfc: virtual_ncidev: Fix memory leak in virtual_nci_send()
@ 2022-10-20 3:05 Shang XiaoJing
2022-10-20 18:18 ` Krzysztof Kozlowski
2022-10-21 5:10 ` patchwork-bot+netdevbpf
0 siblings, 2 replies; 3+ messages in thread
From: Shang XiaoJing @ 2022-10-20 3:05 UTC (permalink / raw)
To: bongsu.jeon, krzysztof.kozlowski, kuba, pabeni, netdev; +Cc: shangxiaojing
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@huawei.com>
---
changes in v2:
- free skb in error paths too.
changes in v3:
- change consume_skb() to kfree_skb() in error paths.
---
drivers/nfc/virtual_ncidev.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/nfc/virtual_ncidev.c b/drivers/nfc/virtual_ncidev.c
index f577449e4935..85c06dbb2c44 100644
--- a/drivers/nfc/virtual_ncidev.c
+++ b/drivers/nfc/virtual_ncidev.c
@@ -54,16 +54,19 @@ static int virtual_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
mutex_lock(&nci_mutex);
if (state != virtual_ncidev_enabled) {
mutex_unlock(&nci_mutex);
+ kfree_skb(skb);
return 0;
}
if (send_buff) {
mutex_unlock(&nci_mutex);
+ kfree_skb(skb);
return -1;
}
send_buff = skb_copy(skb, GFP_KERNEL);
mutex_unlock(&nci_mutex);
wake_up_interruptible(&wq);
+ consume_skb(skb);
return 0;
}
--
2.17.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v3] nfc: virtual_ncidev: Fix memory leak in virtual_nci_send()
2022-10-20 3:05 [PATCH v3] nfc: virtual_ncidev: Fix memory leak in virtual_nci_send() Shang XiaoJing
@ 2022-10-20 18:18 ` Krzysztof Kozlowski
2022-10-21 5:10 ` patchwork-bot+netdevbpf
1 sibling, 0 replies; 3+ messages in thread
From: Krzysztof Kozlowski @ 2022-10-20 18:18 UTC (permalink / raw)
To: Shang XiaoJing, bongsu.jeon, kuba, pabeni, netdev
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@huawei.com>
> ---
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Best regards,
Krzysztof
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v3] nfc: virtual_ncidev: Fix memory leak in virtual_nci_send()
2022-10-20 3:05 [PATCH v3] nfc: virtual_ncidev: Fix memory leak in virtual_nci_send() Shang XiaoJing
2022-10-20 18:18 ` Krzysztof Kozlowski
@ 2022-10-21 5:10 ` patchwork-bot+netdevbpf
1 sibling, 0 replies; 3+ messages in thread
From: patchwork-bot+netdevbpf @ 2022-10-21 5:10 UTC (permalink / raw)
To: Shang XiaoJing; +Cc: bongsu.jeon, krzysztof.kozlowski, kuba, pabeni, netdev
Hello:
This patch was applied to netdev/net.git (master)
by Jakub Kicinski <kuba@kernel.org>:
On Thu, 20 Oct 2022 11:05:05 +0800 you 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
>
> [...]
Here is the summary with links:
- [v3] nfc: virtual_ncidev: Fix memory leak in virtual_nci_send()
https://git.kernel.org/netdev/net/c/e840d8f4a1b3
You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html
^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-10-20 3:05 [PATCH v3] nfc: virtual_ncidev: Fix memory leak in virtual_nci_send() Shang XiaoJing
2022-10-20 18:18 ` Krzysztof Kozlowski
2022-10-21 5:10 ` patchwork-bot+netdevbpf
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