[PATCH 4.14 063/176] ima: Free IMA measurement buffer on error

[Greg Kroah-Hartman]

From: Lakshmi Ramasubramanian <nramas@xxxxxxxxxxxxxxxxxxx>

[ Upstream commit 6d14c6517885fa68524238787420511b87d671df ]

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@xxxxxxxxxxxxxxxxxxx>
Suggested-by: Tyler Hicks <tyhicks@xxxxxxxxxxxxxxxxxxx>
Fixes: 7b8589cc29e7 ("ima: on soft reboot, save the measurement list")
Signed-off-by: Mimi Zohar <zohar@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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 e473eee913cba..40bc385a80768 100644
--- a/security/integrity/ima/ima_kexec.c
+++ b/security/integrity/ima/ima_kexec.c
@@ -122,6 +122,7 @@ 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;
 	}
 
-- 
2.27.0