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Date: Mon, 18 Oct 2021 15:24:37 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Vlad Yasevich <vyasevich@...il.com>, Neil Horman <nhorman@...driver.com>, Eiichi Tsukata <eiichi.tsukata@...anix.com>, Marcelo Ricardo Leitner <marcelo.leitner@...il.com>, Marcelo Ricardo Leitner <mleitner@...hat.com>, Xin Long <lucien.xin@...il.com>, Jakub Kicinski <kuba@...nel.org> Subject: [PATCH 5.14 098/151] sctp: account stream padding length for reconf chunk From: Eiichi Tsukata <eiichi.tsukata@...anix.com> commit a2d859e3fc97e79d907761550dbc03ff1b36479c upstream. 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@...il.com> Cc: Neil Horman <nhorman@...driver.com> Cc: Greg KH <gregkh@...uxfoundation.org> Fixes: cc16f00f6529 ("sctp: add support for generating stream reconf ssn reset request chunk") Reported-by: Eiichi Tsukata <eiichi.tsukata@...anix.com> Signed-off-by: Eiichi Tsukata <eiichi.tsukata@...anix.com> Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com> Signed-off-by: Marcelo Ricardo Leitner <mleitner@...hat.com> Reviewed-by: Xin Long <lucien.xin@...il.com> Link: https://lore.kernel.org/r/b97c1f8b0c7ff79ac4ed206fc2c49d3612e0850c.1634156849.git.mleitner@redhat.com Signed-off-by: Jakub Kicinski <kuba@...nel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- net/sctp/sm_make_chunk.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/net/sctp/sm_make_chunk.c +++ b/net/sctp/sm_make_chunk.c @@ -3697,7 +3697,7 @@ struct sctp_chunk *sctp_make_strreset_re 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;
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