linux-kernel - [for-next][PATCH 10/24] seq_buf: Use size_t for len in seq_buf

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Message-Id: <20181221175656.992792400@goodmis.org>
Date:   Fri, 21 Dec 2018 12:56:28 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Jann Horn <jannh@...gle.com>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [for-next][PATCH 10/24] seq_buf: Use size_t for len in seq_buf_puts()

From: Michael Ellerman <mpe@...erman.id.au>

Jann Horn points out that we're using unsigned int for len in
seq_buf_puts(), which could potentially overflow if we're passed a
UINT_MAX sized string.

The rest of the code already uses size_t, so we should also use that
in seq_buf_puts() to avoid any issues.

Link: http://lkml.kernel.org/r/20181019042109.8064-2-mpe@ellerman.id.au

Suggested-by: Jann Horn <jannh@...gle.com>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---
 lib/seq_buf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/seq_buf.c b/lib/seq_buf.c
index 6aabb609dd87..bd807f545a9d 100644
--- a/lib/seq_buf.c
+++ b/lib/seq_buf.c
@@ -140,7 +140,7 @@ int seq_buf_bprintf(struct seq_buf *s, const char *fmt, const u32 *binary)
  */
 int seq_buf_puts(struct seq_buf *s, const char *str)
 {
-	unsigned int len = strlen(str);
+	size_t len = strlen(str);
 
 	WARN_ON(s->size == 0);
 
-- 
2.19.2