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From: Ivan Malov <ivan.malov@oktetlabs.ru>
To: dev@dpdk.org
Cc: Andy Moreton <amoreton@xilinx.com>,
	stable@dpdk.org, Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>,
	Ferruh Yigit <ferruh.yigit@intel.com>
Subject: [dpdk-stable] [PATCH 1/2] common/sfc_efx/base: limit reported MCDI response length
Date: Tue, 18 May 2021 18:10:11 +0300
Message-ID: <20210518151012.14277-1-ivan.malov@oktetlabs.ru> (raw)

From: Andy Moreton <amoreton@xilinx.com>

MCDI helper routines in libefx include length checks for response
messages, to ensure that short replies and optional fields are
handled correctly.

If the MCDI response message from the firmware is larger than the
caller's buffer then the response length reported to the caller
should be limited to the buffer size. Otherwise length checks in
the caller may allow reading past the end of the buffer.

Fixes: 6f619653b9b1 ("net/sfc/base: import MCDI implementation")
Cc: stable@dpdk.org

Signed-off-by: Andy Moreton <amoreton@xilinx.com>
Signed-off-by: Ivan Malov <ivan.malov@oktetlabs.ru>
Reviewed-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
---
 drivers/common/sfc_efx/base/efx_mcdi.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/common/sfc_efx/base/efx_mcdi.c b/drivers/common/sfc_efx/base/efx_mcdi.c
index ff676f8a0..f4e1384d0 100644
--- a/drivers/common/sfc_efx/base/efx_mcdi.c
+++ b/drivers/common/sfc_efx/base/efx_mcdi.c
@@ -516,6 +516,9 @@ efx_mcdi_finish_response(
 	bytes = MIN(emrp->emr_out_length_used, emrp->emr_out_length);
 	efx_mcdi_read_response(enp, emrp->emr_out_buf, resp_off, bytes);
 
+	/* Report bytes copied to caller (response message may be larger) */
+	emrp->emr_out_length_used = bytes;
+
 #if EFSYS_OPT_MCDI_LOGGING
 	if (emtp->emt_logger != NULL) {
 		emtp->emt_logger(emtp->emt_context,
-- 
2.20.1


             reply	other threads:[~2021-05-18 15:10 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-18 15:10 Ivan Malov [this message]
2021-05-18 15:10 ` [dpdk-stable] [PATCH 2/2] common/sfc_efx/base: add missing MCDI response length checks Ivan Malov
2021-05-18 16:41 ` [dpdk-stable] [PATCH 1/2] common/sfc_efx/base: limit reported MCDI response length Ferruh Yigit

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