diff options
| author | Dima Stepanov <dmitrii.stepanov@cloud.ionos.com> | 2021-04-19 09:37:21 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-14 10:49:58 +0200 |
| commit | 3eb3f148eb9a978a375d983bfdf4cb60dcb1dbca (patch) | |
| tree | 6155460976f1f0e2225f3f60ed5aac81db05b782 | |
| parent | 51bf90901952aaac564bbdb36b2b503050c53dd9 (diff) | |
block/rnbd-clt-sysfs: Remove copy buffer overlap in rnbd_clt_get_path_name
[ Upstream commit 3db7cf55d532a15ea26b4a14e8f8729ccd96fd22 ]
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>
Link: https://lore.kernel.org/r/20210419073722.15351-19-gi-oh.kim@ionos.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/block/rnbd/rnbd-clt-sysfs.c | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/drivers/block/rnbd/rnbd-clt-sysfs.c b/drivers/block/rnbd/rnbd-clt-sysfs.c index 526c77cd7a50..49ad400a5225 100644 --- a/drivers/block/rnbd/rnbd-clt-sysfs.c +++ b/drivers/block/rnbd/rnbd-clt-sysfs.c @@ -483,11 +483,7 @@ 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; |