Re: [PATCH v2] net: qrtr: free flow in __qrtr_node_release

From: David Miller
Date: Tue Jun 30 2020 - 19:28:18 EST


From: Carl Huang <cjhuang@xxxxxxxxxxxxxx>
Date: Tue, 30 Jun 2020 14:52:51 +0800

> The flow is allocated in qrtr_tx_wait, but not freed when qrtr node
> is released. (*slot) becomes NULL after radix_tree_iter_delete is
> called in __qrtr_node_release. The fix is to save (*slot) to a
> vairable and then free it.
>
> This memory leak is catched when kmemleak is enabled in kernel,
> the report looks like below:
>
> unreferenced object 0xffffa0de69e08420 (size 32):
> comm "kworker/u16:3", pid 176, jiffies 4294918275 (age 82858.876s)
> hex dump (first 32 bytes):
> 00 00 00 00 00 00 00 00 28 84 e0 69 de a0 ff ff ........(..i....
> 28 84 e0 69 de a0 ff ff 03 00 00 00 00 00 00 00 (..i............
> backtrace:
> [<00000000e252af0a>] qrtr_node_enqueue+0x38e/0x400 [qrtr]
> [<000000009cea437f>] qrtr_sendmsg+0x1e0/0x2a0 [qrtr]
> [<000000008bddbba4>] sock_sendmsg+0x5b/0x60
> [<0000000003beb43a>] qmi_send_message.isra.3+0xbe/0x110 [qmi_helpers]
> [<000000009c9ae7de>] qmi_send_request+0x1c/0x20 [qmi_helpers]
>
> Signed-off-by: Carl Huang <cjhuang@xxxxxxxxxxxxxx>

Applied and queued up for -stable, thanks.