From: Christian Borntraeger <cborntra@de.ibm.com>
Date: Mon, 7 Nov 2005 08:59:12 +0000 (-0800)
Subject: [PATCH] s390: fix memory leak in vmcp
X-Git-Tag: firefly_0821_release~40762
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=a5da866fe0272db6b664d4c790ad98320bf2feb6;p=firefly-linux-kernel-4.4.55.git

[PATCH] s390: fix memory leak in vmcp

If vmcp is interrupted by a signal the vmcp command buffer is not freed.
Found by Pete Zaitcev.

Signed-off-by: Christian Borntraeger <cborntra@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/drivers/s390/char/vmcp.c b/drivers/s390/char/vmcp.c
index 8990d8076e7d..19762f3476aa 100644
--- a/drivers/s390/char/vmcp.c
+++ b/drivers/s390/char/vmcp.c
@@ -103,8 +103,10 @@ vmcp_write(struct file *file, const char __user * buff, size_t count,
 	}
 	cmd[count] = '\0';
 	session = (struct vmcp_session *)file->private_data;
-	if (down_interruptible(&session->mutex))
+	if (down_interruptible(&session->mutex)) {
+		kfree(cmd);
 		return -ERESTARTSYS;
+	}
 	if (!session->response)
 		session->response = (char *)__get_free_pages(GFP_KERNEL
 						| __GFP_REPEAT 	| GFP_DMA,