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From 41edf6f45895193f4a523cb0a08d639c9ff9ccc9 Mon Sep 17 00:00:00 2001
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From: Logan Gunthorpe <logang@deltatee.com>
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Date: Wed, 22 Jun 2022 14:25:12 -0600
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Subject: [PATCH 37/83] mdadm: Fix optional --write-behind parameter
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The commit noted below changed the behaviour of --write-behind to
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require an argument. This broke the 06wrmostly test with the error:
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mdadm: Invalid value for maximum outstanding write-behind writes: (null).
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Must be between 0 and 16383.
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To fix this, check if optarg is NULL before parising it, as the origial
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code did.
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Fixes: 60815698c0ac ("Refactor parse_num and use it to parse optarg.")
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Cc: Mateusz Grzonka <mateusz.grzonka@intel.com>
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Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
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Acked-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
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Signed-off-by: Jes Sorensen <jes@trained-monkey.org>
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---
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mdadm.c | 5 +++--
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1 file changed, 3 insertions(+), 2 deletions(-)
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diff --git a/mdadm.c b/mdadm.c
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index d0c5e6de..56722ed9 100644
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--- a/mdadm.c
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+++ b/mdadm.c
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@@ -1201,8 +1201,9 @@ int main(int argc, char *argv[])
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case O(BUILD, WriteBehind):
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case O(CREATE, WriteBehind):
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s.write_behind = DEFAULT_MAX_WRITE_BEHIND;
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- if (parse_num(&s.write_behind, optarg) != 0 ||
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- s.write_behind < 0 || s.write_behind > 16383) {
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+ if (optarg &&
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+ (parse_num(&s.write_behind, optarg) != 0 ||
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+ s.write_behind < 0 || s.write_behind > 16383)) {
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pr_err("Invalid value for maximum outstanding write-behind writes: %s.\n\tMust be between 0 and 16383.\n",
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optarg);
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exit(2);
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--
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2.38.1
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