* [PATCH net] sctp: account stream padding length for reconf chunk
@ 2021-10-13 20:27 Marcelo Ricardo Leitner
2021-10-14 4:38 ` Xin Long
2021-10-14 14:30 ` patchwork-bot+netdevbpf
0 siblings, 2 replies; 3+ messages in thread
From: Marcelo Ricardo Leitner @ 2021-10-13 20:27 UTC (permalink / raw)
To: netdev, Vlad Yasevich, Neil Horman, Eiichi Tsukata
Cc: David S . Miller, Jakub Kicinski, linux-kernel, Greg KH, Xin Long
From: Eiichi Tsukata <eiichi.tsukata@nutanix.com>
sctp_make_strreset_req() makes repeated calls to sctp_addto_chunk()
which will automatically account for padding on each call. inreq and
outreq are already 4 bytes aligned, but the payload is not and doing
SCTP_PAD4(a + b) (which _sctp_make_chunk() did implicitly here) is
different from SCTP_PAD4(a) + SCTP_PAD4(b) and not enough. It led to
possible attempt to use more buffer than it was allocated and triggered
a BUG_ON.
Cc: Vlad Yasevich <vyasevich@gmail.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: linux-sctp@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: Greg KH <gregkh@linuxfoundation.org>
Fixes: cc16f00f6529 ("sctp: add support for generating stream reconf ssn reset request chunk")
Reported-by: Eiichi Tsukata <eiichi.tsukata@nutanix.com>
Signed-off-by: Eiichi Tsukata <eiichi.tsukata@nutanix.com>
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Marcelo Ricardo Leitner <mleitner@redhat.com>
---
net/sctp/sm_make_chunk.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index b8fa8f1a7277..c7503fd64915 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -3697,7 +3697,7 @@ struct sctp_chunk *sctp_make_strreset_req(
outlen = (sizeof(outreq) + stream_len) * out;
inlen = (sizeof(inreq) + stream_len) * in;
- retval = sctp_make_reconf(asoc, outlen + inlen);
+ retval = sctp_make_reconf(asoc, SCTP_PAD4(outlen) + SCTP_PAD4(inlen));
if (!retval)
return NULL;
--
2.31.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH net] sctp: account stream padding length for reconf chunk
2021-10-13 20:27 [PATCH net] sctp: account stream padding length for reconf chunk Marcelo Ricardo Leitner
@ 2021-10-14 4:38 ` Xin Long
2021-10-14 14:30 ` patchwork-bot+netdevbpf
1 sibling, 0 replies; 3+ messages in thread
From: Xin Long @ 2021-10-14 4:38 UTC (permalink / raw)
To: Marcelo Ricardo Leitner
Cc: network dev, Vlad Yasevich, Neil Horman, Eiichi Tsukata,
David S . Miller, Jakub Kicinski, LKML, Greg KH,
linux-sctp @ vger . kernel . org
On Thu, Oct 14, 2021 at 4:27 AM Marcelo Ricardo Leitner
<marcelo.leitner@gmail.com> wrote:
>
> From: Eiichi Tsukata <eiichi.tsukata@nutanix.com>
>
> sctp_make_strreset_req() makes repeated calls to sctp_addto_chunk()
> which will automatically account for padding on each call. inreq and
> outreq are already 4 bytes aligned, but the payload is not and doing
> SCTP_PAD4(a + b) (which _sctp_make_chunk() did implicitly here) is
> different from SCTP_PAD4(a) + SCTP_PAD4(b) and not enough. It led to
> possible attempt to use more buffer than it was allocated and triggered
> a BUG_ON.
>
> Cc: Vlad Yasevich <vyasevich@gmail.com>
> Cc: Neil Horman <nhorman@tuxdriver.com>
> Cc: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Jakub Kicinski <kuba@kernel.org>
> Cc: linux-sctp@vger.kernel.org
> Cc: netdev@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Cc: Greg KH <gregkh@linuxfoundation.org>
> Fixes: cc16f00f6529 ("sctp: add support for generating stream reconf ssn reset request chunk")
> Reported-by: Eiichi Tsukata <eiichi.tsukata@nutanix.com>
> Signed-off-by: Eiichi Tsukata <eiichi.tsukata@nutanix.com>
> Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
> Signed-off-by: Marcelo Ricardo Leitner <mleitner@redhat.com>
> ---
> net/sctp/sm_make_chunk.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
> index b8fa8f1a7277..c7503fd64915 100644
> --- a/net/sctp/sm_make_chunk.c
> +++ b/net/sctp/sm_make_chunk.c
> @@ -3697,7 +3697,7 @@ struct sctp_chunk *sctp_make_strreset_req(
> outlen = (sizeof(outreq) + stream_len) * out;
> inlen = (sizeof(inreq) + stream_len) * in;
>
> - retval = sctp_make_reconf(asoc, outlen + inlen);
> + retval = sctp_make_reconf(asoc, SCTP_PAD4(outlen) + SCTP_PAD4(inlen));
> if (!retval)
> return NULL;
>
> --
> 2.31.1
>
Reviewed-by: Xin Long <lucien.xin@gmail.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH net] sctp: account stream padding length for reconf chunk
2021-10-13 20:27 [PATCH net] sctp: account stream padding length for reconf chunk Marcelo Ricardo Leitner
2021-10-14 4:38 ` Xin Long
@ 2021-10-14 14:30 ` patchwork-bot+netdevbpf
1 sibling, 0 replies; 3+ messages in thread
From: patchwork-bot+netdevbpf @ 2021-10-14 14:30 UTC (permalink / raw)
To: Marcelo Ricardo Leitner
Cc: netdev, vyasevich, nhorman, eiichi.tsukata, davem, kuba,
linux-kernel, gregkh, lucien.xin
Hello:
This patch was applied to netdev/net.git (master)
by Jakub Kicinski <kuba@kernel.org>:
On Wed, 13 Oct 2021 17:27:29 -0300 you wrote:
> From: Eiichi Tsukata <eiichi.tsukata@nutanix.com>
>
> sctp_make_strreset_req() makes repeated calls to sctp_addto_chunk()
> which will automatically account for padding on each call. inreq and
> outreq are already 4 bytes aligned, but the payload is not and doing
> SCTP_PAD4(a + b) (which _sctp_make_chunk() did implicitly here) is
> different from SCTP_PAD4(a) + SCTP_PAD4(b) and not enough. It led to
> possible attempt to use more buffer than it was allocated and triggered
> a BUG_ON.
>
> [...]
Here is the summary with links:
- [net] sctp: account stream padding length for reconf chunk
https://git.kernel.org/netdev/net/c/a2d859e3fc97
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
end of thread, other threads:[~2021-10-14 14:30 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-10-13 20:27 [PATCH net] sctp: account stream padding length for reconf chunk Marcelo Ricardo Leitner
2021-10-14 4:38 ` Xin Long
2021-10-14 14:30 ` patchwork-bot+netdevbpf
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).