linux-kernel - [PATCH 02/13] hvc: Fix use of uninitialized array in udbg_hvc

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Date:   Thu, 14 Dec 2023 05:55:28 +0000
From:   Nicholas Miehlbradt <nicholas@...ux.ibm.com>
To:     glider@...gle.com, elver@...gle.com, dvyukov@...gle.com,
        akpm@...ux-foundation.org, mpe@...erman.id.au, npiggin@...il.com,
        christophe.leroy@...roup.eu
Cc:     linux-mm@...ck.org, kasan-dev@...glegroups.com, iii@...ux.ibm.com,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Nicholas Miehlbradt <nicholas@...ux.ibm.com>
Subject: [PATCH 02/13] hvc: Fix use of uninitialized array in udbg_hvc_putc

All elements of bounce_buffer are eventually read and passed to the
hypervisor so it should probably be fully initialized.

Signed-off-by: Nicholas Miehlbradt <nicholas@...ux.ibm.com>
---
 drivers/tty/hvc/hvc_vio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/hvc/hvc_vio.c b/drivers/tty/hvc/hvc_vio.c
index 736b230f5ec0..1e88bfcdde20 100644
--- a/drivers/tty/hvc/hvc_vio.c
+++ b/drivers/tty/hvc/hvc_vio.c
@@ -227,7 +227,7 @@ static const struct hv_ops hvterm_hvsi_ops = {
 static void udbg_hvc_putc(char c)
 {
 	int count = -1;
-	unsigned char bounce_buffer[16];
+	unsigned char bounce_buffer[16] = { 0 };
 
 	if (!hvterm_privs[0])
 		return;
-- 
2.40.1