* [MPTCP] [PATCH net v2] mptcp: fix uninitialized value access
@ 2020-04-30 13:03 ` Paolo Abeni
0 siblings, 0 replies; 4+ messages in thread
From: Paolo Abeni @ 2020-04-30 13:03 UTC (permalink / raw)
To: mptcp
[-- Attachment #1: Type: text/plain, Size: 1025 bytes --]
tcp_v{4,6}_syn_recv_sock() set 'own_req' only when returning
a not NULL 'child', let's check 'own_req' only if child is
available to avoid an - unharmful - UBSAN splat.
v1 -> v2:
- reference the correct hash
Fixes: 4c8941de781c ("mptcp: avoid flipping mp_capable field in syn_recv_sock()")
Signed-off-by: Paolo Abeni <pabeni(a)redhat.com>
---
net/mptcp/subflow.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index bad998529767..67a4e35d4838 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -523,7 +523,7 @@ static struct sock *subflow_syn_recv_sock(const struct sock *sk,
/* check for expected invariant - should never trigger, just help
* catching eariler subtle bugs
*/
- WARN_ON_ONCE(*own_req && child && tcp_sk(child)->is_mptcp &&
+ WARN_ON_ONCE(child && *own_req && tcp_sk(child)->is_mptcp &&
(!mptcp_subflow_ctx(child) ||
!mptcp_subflow_ctx(child)->conn));
return child;
--
2.21.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH net v2] mptcp: fix uninitialized value access
@ 2020-04-30 13:03 ` Paolo Abeni
0 siblings, 0 replies; 4+ messages in thread
From: Paolo Abeni @ 2020-04-30 13:03 UTC (permalink / raw)
To: netdev
Cc: Mat Martineau, Matthieu Baerts, David S. Miller, Jakub Kicinski, mptcp
tcp_v{4,6}_syn_recv_sock() set 'own_req' only when returning
a not NULL 'child', let's check 'own_req' only if child is
available to avoid an - unharmful - UBSAN splat.
v1 -> v2:
- reference the correct hash
Fixes: 4c8941de781c ("mptcp: avoid flipping mp_capable field in syn_recv_sock()")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
net/mptcp/subflow.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index bad998529767..67a4e35d4838 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -523,7 +523,7 @@ static struct sock *subflow_syn_recv_sock(const struct sock *sk,
/* check for expected invariant - should never trigger, just help
* catching eariler subtle bugs
*/
- WARN_ON_ONCE(*own_req && child && tcp_sk(child)->is_mptcp &&
+ WARN_ON_ONCE(child && *own_req && tcp_sk(child)->is_mptcp &&
(!mptcp_subflow_ctx(child) ||
!mptcp_subflow_ctx(child)->conn));
return child;
--
2.21.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [MPTCP] Re: [PATCH net v2] mptcp: fix uninitialized value access
2020-04-30 13:03 ` Paolo Abeni
@ 2020-04-30 19:34 ` David Miller
-1 siblings, 0 replies; 4+ messages in thread
From: David Miller @ 2020-04-30 19:34 UTC (permalink / raw)
To: mptcp
[-- Attachment #1: Type: text/plain, Size: 461 bytes --]
From: Paolo Abeni <pabeni(a)redhat.com>
Date: Thu, 30 Apr 2020 15:03:22 +0200
> tcp_v{4,6}_syn_recv_sock() set 'own_req' only when returning
> a not NULL 'child', let's check 'own_req' only if child is
> available to avoid an - unharmful - UBSAN splat.
>
> v1 -> v2:
> - reference the correct hash
>
> Fixes: 4c8941de781c ("mptcp: avoid flipping mp_capable field in syn_recv_sock()")
> Signed-off-by: Paolo Abeni <pabeni(a)redhat.com>
Applied.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH net v2] mptcp: fix uninitialized value access
@ 2020-04-30 19:34 ` David Miller
0 siblings, 0 replies; 4+ messages in thread
From: David Miller @ 2020-04-30 19:34 UTC (permalink / raw)
To: pabeni; +Cc: netdev, mathew.j.martineau, matthieu.baerts, kuba, mptcp
From: Paolo Abeni <pabeni@redhat.com>
Date: Thu, 30 Apr 2020 15:03:22 +0200
> tcp_v{4,6}_syn_recv_sock() set 'own_req' only when returning
> a not NULL 'child', let's check 'own_req' only if child is
> available to avoid an - unharmful - UBSAN splat.
>
> v1 -> v2:
> - reference the correct hash
>
> Fixes: 4c8941de781c ("mptcp: avoid flipping mp_capable field in syn_recv_sock()")
> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Applied.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2020-04-30 19:34 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2020-04-30 19:34 [MPTCP] Re: [PATCH net v2] mptcp: fix uninitialized value access David Miller
2020-04-30 19:34 ` David Miller
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2020-04-30 13:03 [MPTCP] " Paolo Abeni
2020-04-30 13:03 ` Paolo Abeni
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