Netdev Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Pavel Skripkin <paskripkin@gmail.com>
To: mani@kernel.org, davem@davemloft.net, kuba@kernel.org,
	bjorn.andersson@sonymobile.com, courtney.cavin@sonymobile.com
Cc: linux-arm-msm@vger.kernel.org, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Pavel Skripkin <paskripkin@gmail.com>,
	syzbot+35a511c72ea7356cdcf3@syzkaller.appspotmail.com
Subject: [PATCH] net: qrtr: fix memory leak in qrtr_local_enqueue
Date: Thu, 22 Jul 2021 19:16:25 +0300	[thread overview]
Message-ID: <20210722161625.6956-1-paskripkin@gmail.com> (raw)

Syzbot reported memory leak in qrtr. The problem was in unputted
struct sock. qrtr_local_enqueue() function calls qrtr_port_lookup()
which takes sock reference if port was found. Then there is the following
check:

if (!ipc || &ipc->sk == skb->sk) {
	...
	return -ENODEV;
}

Since we should drop the reference before returning from this function and
ipc can be non-NULL inside this if, we should add qrtr_port_put() inside
this if.

Fixes: bdabad3e363d ("net: Add Qualcomm IPC router")
Reported-and-tested-by: syzbot+35a511c72ea7356cdcf3@syzkaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
---
 net/qrtr/qrtr.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c
index e6f4a6202f82..d5ce428d0b25 100644
--- a/net/qrtr/qrtr.c
+++ b/net/qrtr/qrtr.c
@@ -839,6 +839,8 @@ static int qrtr_local_enqueue(struct qrtr_node *node, struct sk_buff *skb,
 
 	ipc = qrtr_port_lookup(to->sq_port);
 	if (!ipc || &ipc->sk == skb->sk) { /* do not send to self */
+		if (ipc)
+			qrtr_port_put(ipc);
 		kfree_skb(skb);
 		return -ENODEV;
 	}
-- 
2.32.0


             reply	other threads:[~2021-07-22 16:16 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-22 16:16 Pavel Skripkin [this message]
2021-07-23 12:27 ` Manivannan Sadhasivam
2021-07-23 15:08   ` Pavel Skripkin
2021-07-23 15:31   ` [PATCH v2] net: qrtr: fix memory leaks Pavel Skripkin
2021-07-23 15:43     ` Manivannan Sadhasivam
2021-07-23 16:50     ` patchwork-bot+netdevbpf

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210722161625.6956-1-paskripkin@gmail.com \
    --to=paskripkin@gmail.com \
    --cc=bjorn.andersson@sonymobile.com \
    --cc=courtney.cavin@sonymobile.com \
    --cc=davem@davemloft.net \
    --cc=kuba@kernel.org \
    --cc=linux-arm-msm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mani@kernel.org \
    --cc=netdev@vger.kernel.org \
    --cc=syzbot+35a511c72ea7356cdcf3@syzkaller.appspotmail.com \
    --subject='Re: [PATCH] net: qrtr: fix memory leak in qrtr_local_enqueue' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).