linux-kernel - [PATCH] quota: avoid printing an uninitialized blk number

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Message-Id: <20240213101733.461544-1-arnd@kernel.org>
Date: Tue, 13 Feb 2024 11:17:28 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: Jan Kara <jack@...e.com>
Cc: Arnd Bergmann <arnd@...db.de>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] quota: avoid printing an uninitialized blk number

From: Arnd Bergmann <arnd@...db.de>

The error path of find_tree_dqentry() now prints a variable that is
never initialized:

fs/quota/quota_tree.c:674:8: error: variable 'blk' is uninitialized when used here [-Werror,-Wuninitialized]
                            blk);
                            ^~~
include/linux/quotaops.h:34:41: note: expanded from macro 'quota_error'
        __quota_error((sb), __func__, fmt , ## args)
                                               ^~~~

Move the calculation of the block number slightly up to make it
show a sensible number.

Fixes: 223bfb57631b ("quota: Detect loops in quota tree")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 fs/quota/quota_tree.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/quota/quota_tree.c b/fs/quota/quota_tree.c
index afceef3ddfaa..05ae39f9b1ac 100644
--- a/fs/quota/quota_tree.c
+++ b/fs/quota/quota_tree.c
@@ -669,13 +669,13 @@ static loff_t find_tree_dqentry(struct qtree_mem_dqinfo *info,
 	if (!buf)
 		return -ENOMEM;
 	ret = read_blk(info, blks[depth], buf);
+	blk = le32_to_cpu(ref[get_index(info, dquot->dq_id, depth)]);
 	if (ret < 0) {
 		quota_error(dquot->dq_sb, "Can't read quota tree block %u",
 			    blks[depth]);
 		goto out_buf;
 	}
 	ret = 0;
-	blk = le32_to_cpu(ref[get_index(info, dquot->dq_id, depth)]);
 	if (!blk)	/* No reference? */
 		goto out_buf;
 	ret = do_check_range(dquot->dq_sb, "block", blk, QT_TREEOFF,
-- 
2.39.2