linux-kernel - [PATCH] md: md2: fix an incorrect NULL check on list iterator

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Date:   Sun, 27 Mar 2022 16:01:11 +0800
From:   Xiaomeng Tong <xiam0nd.tong@...il.com>
To:     song@...nel.org, rgoldwyn@...e.com
Cc:     linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
        Xiaomeng Tong <xiam0nd.tong@...il.com>, stable@...r.kernel.org
Subject: [PATCH] md: md2: fix an incorrect NULL check on list iterator

The bug is here:
	if (!rdev || rdev->desc_nr != nr) {

The list iterator value 'rdev' will *always* be set and non-NULL
by rdev_for_each_rcu(), so it is incorrect to assume that the
iterator value will be NULL if the list is empty or no element
found (In fact, it will be a bogus pointer to an invalid struct
object containing the HEAD). Otherwise it will bypass the check
and lead to invalid memory access passing the check.

To fix the bug, use a new variable 'iter' as the list iterator,
while use the original variable 'pdev' as a dedicated pointer to
point to the found element.

Cc: stable@...r.kernel.org
Fixes: 70bcecdb1534 ("amd-cluster: Improve md_reload_sb to be less error prone")
Signed-off-by: Xiaomeng Tong <xiam0nd.tong@...il.com>
---
 drivers/md/md.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 7476fc204172..f156678c08bc 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -9794,16 +9794,18 @@ static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
 
 void md_reload_sb(struct mddev *mddev, int nr)
 {
-	struct md_rdev *rdev;
+	struct md_rdev *rdev = NULL, *iter;
 	int err;
 
 	/* Find the rdev */
-	rdev_for_each_rcu(rdev, mddev) {
-		if (rdev->desc_nr == nr)
+	rdev_for_each_rcu(iter, mddev) {
+		if (iter->desc_nr == nr) {
+			rdev = iter;
 			break;
+		}
 	}
 
-	if (!rdev || rdev->desc_nr != nr) {
+	if (!rdev) {
 		pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
 		return;
 	}
-- 
2.17.1