linux-hardening - [PATCH] pstore/platform: Add check for kstrdup

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Date:   Wed, 14 Jun 2023 18:00:20 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     keescook@...omium.org, tony.luck@...el.com, gpiccoli@...lia.com
Cc:     linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] pstore/platform: Add check for kstrdup

Add check for the return value of kstrdup() and return the error
if it fails in order to avoid NULL pointer dereference.

Fixes: 563ca40ddf40 ("pstore/platform: Switch pstore_info::name to const")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 fs/pstore/platform.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index cbc0b468c1ab..afe07f0d1216 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -631,6 +631,10 @@ int pstore_register(struct pstore_info *psi)
 	 * through /sys/module/pstore/parameters/backend
 	 */
 	backend = kstrdup(psi->name, GFP_KERNEL);
+	if (!backend) {
+		mutex_unlock(&psinfo_lock);
+		return -ENOMEM;
+	}
 
 	pr_info("Registered %s as persistent store backend\n", psi->name);
 
-- 
2.25.1