From: John Fastabend <john.fastabend@gmail.com>
To: ast@kernel.org, daniel@iogearbox.net, andriin@fb.com
Cc: john.fastabend@gmail.com, bpf@vger.kernel.org, netdev@vger.kernel.org
Subject: [PATCH bpf, sockmap 1/2] bpf, sockmap: fix potential memory leak on unlikely error case
Date: Wed, 30 Jun 2021 14:53:48 -0700 [thread overview]
Message-ID: <20210630215349.73263-2-john.fastabend@gmail.com> (raw)
In-Reply-To: <20210630215349.73263-1-john.fastabend@gmail.com>
If skb_linearize is needed and fails we could leak a msg on the error
handling. To fix ensure we kfree the msg block before returning error.
Found during code review.
Fixes: 4363023d2668e ("bpf, sockmap: Avoid failures from skb_to_sgvec when skb has frag_list")
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
---
net/core/skmsg.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/net/core/skmsg.c b/net/core/skmsg.c
index 9b6160a191f8..22603289c2b2 100644
--- a/net/core/skmsg.c
+++ b/net/core/skmsg.c
@@ -505,8 +505,10 @@ static int sk_psock_skb_ingress_enqueue(struct sk_buff *skb,
* drop the skb. We need to linearize the skb so that the mapping
* in skb_to_sgvec can not error.
*/
- if (skb_linearize(skb))
+ if (skb_linearize(skb)) {
+ kfree(msg);
return -EAGAIN;
+ }
num_sge = skb_to_sgvec(skb, msg->sg.data, 0, skb->len);
if (unlikely(num_sge < 0)) {
kfree(msg);
--
2.25.1
next prev parent reply other threads:[~2021-06-30 21:54 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-30 21:53 [PATCH bpf, sockmap 0/2] potential memleak and proc stats fix John Fastabend
2021-06-30 21:53 ` John Fastabend [this message]
2021-06-30 21:53 ` [PATCH bpf, sockmap 2/2] bpf, sockmap: sk_prot needs inuse_idx set for proc stats John Fastabend
2021-07-01 6:58 ` kernel test robot
2021-07-01 8:21 ` kernel test robot
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=20210630215349.73263-2-john.fastabend@gmail.com \
--to=john.fastabend@gmail.com \
--cc=andriin@fb.com \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=daniel@iogearbox.net \
--cc=netdev@vger.kernel.org \
/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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
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).