linux-kernel - [PATCH] speakup: Avoid crash on very long word

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Date: Sat, 23 Mar 2024 17:48:43 +0100
From: Samuel Thibault <samuel.thibault@...-lyon.org>
To: gregkh@...uxfoundation.org
Cc: Samuel Thibault <samuel.thibault@...-lyon.org>,
	linux-kernel@...r.kernel.org,
	speakup@...ux-speakup.org,
	stable@...r.kernel.org
Subject: [PATCH] speakup: Avoid crash on very long word

In case a console is set up really large and contains a really long word
(> 256 characters), we have to stop before the length of the word buffer.

Signed-off-by: Samuel Thibault <samuel.thibault@...-lyon.org>
Fixes: c6e3fd22cd538 ("Staging: add speakup to the staging directory")
Cc: stable@...r.kernel.org
---
 drivers/accessibility/speakup/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/accessibility/speakup/main.c b/drivers/accessibility/speakup/main.c
index 1fbc9b921c4f..736c2eb8c0f3 100644
--- a/drivers/accessibility/speakup/main.c
+++ b/drivers/accessibility/speakup/main.c
@@ -574,7 +574,7 @@ static u_long get_word(struct vc_data *vc)
 	}
 	attr_ch = get_char(vc, (u_short *)tmp_pos, &spk_attr);
 	buf[cnt++] = attr_ch;
-	while (tmpx < vc->vc_cols - 1) {
+	while (tmpx < vc->vc_cols - 1 && cnt < sizeof(buf) - 1) {
 		tmp_pos += 2;
 		tmpx++;
 		ch = get_char(vc, (u_short *)tmp_pos, &temp);
-- 
2.43.0