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From c8d1c398505b62d9129a4e711f17e4469f4327ff Mon Sep 17 00:00:00 2001
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From: Kinga Tanska <kinga.tanska@intel.com>
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Date: Thu, 14 Jul 2022 09:02:10 +0200
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Subject: [PATCH 29/83] Monitor: use devname as char array instead of pointer
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Device name wasn't filled properly due to incorrect use of strcpy.
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Strcpy was used twice. Firstly to fill devname with "/dev/md/"
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and then to add chosen name. First strcpy result was overwritten by
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second one (as a result <device_name> instead of "/dev/md/<device_name>"
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was assigned). This commit changes this implementation to use snprintf
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and devname with fixed size.
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Signed-off-by: Kinga Tanska <kinga.tanska@intel.com>
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Signed-off-by: Jes Sorensen <jsorensen@fb.com>
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---
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Monitor.c | 8 +++++---
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1 file changed, 5 insertions(+), 3 deletions(-)
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diff --git a/Monitor.c b/Monitor.c
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index 6ca1ebe5..a5b11ae2 100644
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--- a/Monitor.c
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+++ b/Monitor.c
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@@ -190,9 +190,11 @@ int Monitor(struct mddev_dev *devlist,
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if (mdlist->devname[0] == '/')
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st->devname = xstrdup(mdlist->devname);
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else {
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- st->devname = xmalloc(8+strlen(mdlist->devname)+1);
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- strcpy(strcpy(st->devname, "/dev/md/"),
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- mdlist->devname);
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+ /* length of "/dev/md/" + device name + terminating byte */
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+ size_t _len = sizeof("/dev/md/") + strnlen(mdlist->devname, PATH_MAX);
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+
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+ st->devname = xcalloc(_len, sizeof(char));
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+ snprintf(st->devname, _len, "/dev/md/%s", mdlist->devname);
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}
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if (!is_mddev(mdlist->devname))
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return 1;
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--
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2.38.1
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