linux-kernel - [PATCH v2 1/2] ima: Free IMA measurement buffer on error

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Message-Id: <20210204174951.25771-1-nramas@linux.microsoft.com>
Date:   Thu,  4 Feb 2021 09:49:50 -0800
From:   Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
To:     zohar@...ux.ibm.com, bauerman@...ux.ibm.com,
        dmitry.kasatkin@...il.com, ebiederm@...ssion.com,
        gregkh@...uxfoundation.org, sashal@...nel.org,
        tyhicks@...ux.microsoft.com
Cc:     linux-integrity@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] ima: Free IMA measurement buffer on error

IMA allocates kernel virtual memory to carry forward the measurement
list, from the current kernel to the next kernel on kexec system call,
in ima_add_kexec_buffer() function.  In error code paths this memory
is not freed resulting in memory leak.

Free the memory allocated for the IMA measurement list in
the error code paths in ima_add_kexec_buffer() function.

Signed-off-by: Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
Suggested-by: Tyler Hicks <tyhicks@...ux.microsoft.com>
Fixes: 7b8589cc29e7 ("ima: on soft reboot, save the measurement list")
---
 security/integrity/ima/ima_kexec.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c
index 121de3e04af2..206ddcaa5c67 100644
--- a/security/integrity/ima/ima_kexec.c
+++ b/security/integrity/ima/ima_kexec.c
@@ -119,6 +119,7 @@ void ima_add_kexec_buffer(struct kimage *image)
 	ret = kexec_add_buffer(&kbuf);
 	if (ret) {
 		pr_err("Error passing over kexec measurement buffer.\n");
+		vfree(kexec_buffer);
 		return;
 	}
 
-- 
2.30.0