linux-kernel - [PATCH] kernel: debug: kdb: kdb_io.c: Cleaning up missing null-terminate after strncpy call

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Date:	Wed,  4 Jun 2014 23:41:36 +0200
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	Jason Wessel <jason.wessel@...driver.com>,
	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
Cc:	kgdb-bugreport@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: [PATCH] kernel: debug: kdb: kdb_io.c:  Cleaning up missing null-terminate after strncpy call

Added a guaranteed null-terminate after call to strncpy.

This was partly found using a static code analysis program called cppcheck.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
---
 kernel/debug/kdb/kdb_io.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c
index 14ff484..0cd0e28 100644
--- a/kernel/debug/kdb/kdb_io.c
+++ b/kernel/debug/kdb/kdb_io.c
@@ -441,8 +441,10 @@ poll_again:
 
 char *kdb_getstr(char *buffer, size_t bufsize, char *prompt)
 {
-	if (prompt && kdb_prompt_str != prompt)
-		strncpy(kdb_prompt_str, prompt, CMD_BUFLEN);
+	if (prompt && kdb_prompt_str != prompt) {
+		strncpy(kdb_prompt_str, prompt, sizeof(kdb_prompt_str));
+		kdb_prompt_str[sizeof(kdb_prompt_str) - 1] = '\0'
+	}
 	kdb_printf(kdb_prompt_str);
 	kdb_nextline = 1;	/* Prompt and input resets line number */
 	return kdb_read(buffer, bufsize);
-- 
1.7.10.4

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