linux-kernel - [PATCH] KEYS: encrypted: Add check for strsep

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Date:   Wed,  8 Nov 2023 07:36:27 +0000
From:   Chen Ni <nichen@...as.ac.cn>
To:     zohar@...ux.ibm.com, dhowells@...hat.com, jarkko@...nel.org,
        paul@...l-moore.com, jmorris@...ei.org, serge@...lyn.com,
        sumit.garg@...aro.org, yaelt@...gle.com
Cc:     linux-integrity@...r.kernel.org, keyrings@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, Chen Ni <nichen@...as.ac.cn>
Subject: [PATCH] KEYS: encrypted: Add check for strsep

Add check for strsep() in order to transfer the error.

Fixes: cd3bc044af48 ("KEYS: encrypted: Instantiate key with user-provided decrypted data")
Signed-off-by: Chen Ni <nichen@...as.ac.cn>
---
 security/keys/encrypted-keys/encrypted.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/security/keys/encrypted-keys/encrypted.c b/security/keys/encrypted-keys/encrypted.c
index 8af2136069d2..76f55dd13cb8 100644
--- a/security/keys/encrypted-keys/encrypted.c
+++ b/security/keys/encrypted-keys/encrypted.c
@@ -237,6 +237,10 @@ static int datablob_parse(char *datablob, const char **format,
 			break;
 		}
 		*decrypted_data = strsep(&datablob, " \t");
+		if (!*decrypted_data) {
+			pr_info("encrypted_key: decrypted_data is missing\n");
+			break;
+		}
 		ret = 0;
 		break;
 	case Opt_load:
-- 
2.25.1