linux-kernel - [PATCH] Drivers: hv: vmbus: One function call less in create_gpadl

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Message-ID: <6d97cafb-ad7c-41c1-9f20-41024bb18515@web.de>
Date: Tue, 26 Dec 2023 20:09:19 +0100
From: Markus Elfring <Markus.Elfring@....de>
To: linux-hyperv@...r.kernel.org, kernel-janitors@...r.kernel.org,
 Dexuan Cui <decui@...rosoft.com>, Haiyang Zhang <haiyangz@...rosoft.com>,
 "K. Y. Srinivasan" <kys@...rosoft.com>, Wei Liu <wei.liu@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, cocci@...ia.fr
Subject: [PATCH] Drivers: hv: vmbus: One function call less in
 create_gpadl_header() after error detection

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Tue, 26 Dec 2023 20:00:24 +0100

The kfree() function was called in two cases by
the create_gpadl_header() function during error handling
even if the passed variable contained a null pointer.
This issue was detected by using the Coccinelle software.

Thus use another label.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/hv/channel.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 56f7e06c673e..4d1bbda895d8 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -336,7 +336,7 @@ static int create_gpadl_header(enum hv_gpadl_type type, void *kbuffer,
 			  sizeof(struct gpa_range) + pfncount * sizeof(u64);
 		msgheader =  kzalloc(msgsize, GFP_KERNEL);
 		if (!msgheader)
-			goto nomem;
+			goto free_body;

 		INIT_LIST_HEAD(&msgheader->submsglist);
 		msgheader->msgsize = msgsize;
@@ -417,7 +417,7 @@ static int create_gpadl_header(enum hv_gpadl_type type, void *kbuffer,
 			  sizeof(struct gpa_range) + pagecount * sizeof(u64);
 		msgheader = kzalloc(msgsize, GFP_KERNEL);
 		if (msgheader == NULL)
-			goto nomem;
+			goto free_body;

 		INIT_LIST_HEAD(&msgheader->submsglist);
 		msgheader->msgsize = msgsize;
@@ -439,6 +439,7 @@ static int create_gpadl_header(enum hv_gpadl_type type, void *kbuffer,
 	return 0;
 nomem:
 	kfree(msgheader);
+free_body:
 	kfree(msgbody);
 	return -ENOMEM;
 }
--
2.43.0