linux-kernel - [PATCH] module: remove use of uninitialized variable len

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Message-Id: <20230417230957.3221615-1-trix@redhat.com>
Date:   Mon, 17 Apr 2023 19:09:57 -0400
From:   Tom Rix <trix@...hat.com>
To:     mcgrof@...nel.org, nathan@...nel.org, ndesaulniers@...gle.com
Cc:     linux-modules@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, Tom Rix <trix@...hat.com>
Subject: [PATCH] module: remove use of uninitialized variable len

clang build reports
kernel/module/stats.c:307:34: error: variable
  'len' is uninitialized when used here [-Werror,-Wuninitialized]
        len = scnprintf(buf + 0, size - len,
                                        ^~~
At the start of this sequence, neither the '+ 0', nor the '- len' are needed.
So remove them and fix using 'len' uninitalized.

Fixes: 0d4ab68ce983 ("module: add debug stats to help identify memory pressure")
Signed-off-by: Tom Rix <trix@...hat.com>
---
 kernel/module/stats.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/module/stats.c b/kernel/module/stats.c
index d9b9bccf4256..f0619170bd3d 100644
--- a/kernel/module/stats.c
+++ b/kernel/module/stats.c
@@ -304,7 +304,7 @@ static ssize_t read_file_mod_stats(struct file *file, char __user *user_buf,
 		return -ENOMEM;
 
 	/* The beginning of our debug preamble */
-	len = scnprintf(buf + 0, size - len, "%25s\t%u\n", "Mods ever loaded", live_mod_count);
+	len = scnprintf(buf, size, "%25s\t%u\n", "Mods ever loaded", live_mod_count);
 
 	len += scnprintf(buf + len, size - len, "%25s\t%u\n", "Mods failed on kread", fkreads);
 
-- 
2.27.0