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From: Gioh Kim <gi-oh.kim@ionos.com>
To: linux-block@vger.kernel.org, linux-doc@vger.kernel.org
Cc: axboe@kernel.dk, akinobu.mita@gmail.com, corbet@lwn.net,
	hch@infradead.org, sagi@grimberg.me, bvanassche@acm.org,
	haris.iqbal@ionos.com, jinpu.wang@ionos.com,
	Dima Stepanov <dmitrii.stepanov@cloud.ionos.com>,
	Dima Stepanov <dmitrii.stepanov@ionos.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Gioh Kim <gi-oh.kim@cloud.ionos.com>,
	Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Subject: [PATCHv5 for-next 18/19] block/rnbd-clt-sysfs: Remove copy buffer overlap in rnbd_clt_get_path_name
Date: Mon, 19 Apr 2021 09:37:21 +0200
Message-ID: <20210419073722.15351-19-gi-oh.kim@ionos.com> (raw)
In-Reply-To: <20210419073722.15351-1-gi-oh.kim@ionos.com>

From: Dima Stepanov <dmitrii.stepanov@cloud.ionos.com>

cppcheck report the following error:
  rnbd/rnbd-clt-sysfs.c:522:36: error: The variable 'buf' is used both
  as a parameter and as destination in snprintf(). The origin and
  destination buffers overlap. Quote from glibc (C-library)
  documentation
  (http://www.gnu.org/software/libc/manual/html_mono/libc.html#Formatted-Output-Functions):
  "If copying takes place between objects that overlap as a result of a
  call to sprintf() or snprintf(), the results are undefined."
  [sprintfOverlappingData]
Fix it by initializing the buf variable in the first snprintf call.

Fixes: 91f4acb2801c ("block/rnbd-clt: support mapping two devices")
Signed-off-by: Dima Stepanov <dmitrii.stepanov@ionos.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Gioh Kim <gi-oh.kim@cloud.ionos.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
---
 drivers/block/rnbd/rnbd-clt-sysfs.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/block/rnbd/rnbd-clt-sysfs.c b/drivers/block/rnbd/rnbd-clt-sysfs.c
index f3a5a62b2062..042566b47bd9 100644
--- a/drivers/block/rnbd/rnbd-clt-sysfs.c
+++ b/drivers/block/rnbd/rnbd-clt-sysfs.c
@@ -514,11 +514,7 @@ static int rnbd_clt_get_path_name(struct rnbd_clt_dev *dev, char *buf,
 	while ((s = strchr(pathname, '/')))
 		s[0] = '!';
 
-	ret = snprintf(buf, len, "%s", pathname);
-	if (ret >= len)
-		return -ENAMETOOLONG;
-
-	ret = snprintf(buf, len, "%s@%s", buf, dev->sess->sessname);
+	ret = snprintf(buf, len, "%s@%s", pathname, dev->sess->sessname);
 	if (ret >= len)
 		return -ENAMETOOLONG;
 
-- 
2.25.1


  parent reply index

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-19  7:37 [PATCHv5 for-next 00/19] Misc update for rnbd Gioh Kim
2021-04-19  7:37 ` [PATCHv5 for-next 01/19] MAINTAINERS: Change maintainer for rnbd module Gioh Kim
2021-04-19  7:37 ` [PATCHv5 for-next 02/19] Documentation/sysfs-block-rnbd: Add descriptions for remap_device and resize Gioh Kim
2021-04-19  7:37 ` [PATCHv5 for-next 03/19] block/rnbd-clt: Remove some arguments from insert_dev_if_not_exists_devpath Gioh Kim
2021-04-19  7:37 ` [PATCHv5 for-next 04/19] block/rnbd-clt: Remove some arguments from rnbd_client_setup_device Gioh Kim
2021-04-19  7:37 ` [PATCHv5 for-next 05/19] block/rnbd-clt: Move add_disk(dev->gd) to rnbd_clt_setup_gen_disk Gioh Kim
2021-04-19  7:37 ` [PATCHv5 for-next 06/19] block/rnbd: Kill rnbd_clt_destroy_default_group Gioh Kim
2021-04-19  7:37 ` [PATCHv5 for-next 07/19] block/rnbd: Kill destroy_device_cb Gioh Kim
2021-04-19  7:37 ` [PATCHv5 for-next 08/19] block/rnbd-clt: Replace {NO_WAIT,WAIT} with RTRS_PERMIT_{WAIT,NOWAIT} Gioh Kim
2021-04-19  7:46   ` Leon Romanovsky
2021-04-19  7:37 ` [PATCHv5 for-next 09/19] block/rnbd-srv: Prevent a deadlock generated by accessing sysfs in parallel Gioh Kim
2021-04-19  7:37 ` [PATCHv5 for-next 10/19] block/rnbd-srv: Remove force_close file after holding a lock Gioh Kim
2021-04-19  7:37 ` [PATCHv5 for-next 11/19] block/rnbd-clt: Improve find_or_create_sess() return check Gioh Kim
2021-04-19  7:37 ` [PATCHv5 for-next 12/19] block/rnbd-clt: Fix missing a memory free when unloading the module Gioh Kim
2021-04-19  7:37 ` [PATCHv5 for-next 13/19] block/rnbd-clt: Support polling mode for IO latency optimization Gioh Kim
2021-04-19  7:47   ` Leon Romanovsky
2021-04-19  7:37 ` [PATCHv5 for-next 14/19] Documentation/ABI/rnbd-clt: Add description for nr_poll_queues Gioh Kim
2021-04-19  7:37 ` [PATCHv5 for-next 15/19] block/rnbd-srv: Remove unused arguments of rnbd_srv_rdma_ev Gioh Kim
2021-04-19  7:47   ` Leon Romanovsky
2021-04-19  7:37 ` [PATCHv5 for-next 16/19] block/rnbd-clt: Generate kobject_uevent when the rnbd device state changes Gioh Kim
2021-04-19  7:37 ` [PATCHv5 for-next 17/19] block/rnbd-clt: Remove max_segment_size Gioh Kim
2021-04-19  7:47   ` Leon Romanovsky
2021-04-19  7:37 ` Gioh Kim [this message]
2021-04-19  7:37 ` [PATCHv5 for-next 19/19] block/rnbd: Use strscpy instead of strlcpy Gioh Kim
2021-04-19 17:54 ` [PATCHv5 for-next 00/19] Misc update for rnbd Jens Axboe

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