linux-ext4 - [PATCH] ext4: fix memory leak in ext4_fname_setup

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Date:   Tue,  1 Aug 2023 15:41:36 +0100
From:   Luís Henriques <lhenriques@...e.de>
To:     "Theodore Ts'o" <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>
Cc:     linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        Luís Henriques <lhenriques@...e.de>
Subject: [PATCH] ext4: fix memory leak in ext4_fname_setup_filename() error path

If casefolding the filename fails, we'll be leaking fscrypt_buf name.
Make sure we free it in the error path.

Signed-off-by: Luís Henriques <lhenriques@...e.de>
---
 fs/ext4/crypto.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/ext4/crypto.c b/fs/ext4/crypto.c
index e20ac0654b3f..9e4503b051c4 100644
--- a/fs/ext4/crypto.c
+++ b/fs/ext4/crypto.c
@@ -33,6 +33,8 @@ int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
 
 #if IS_ENABLED(CONFIG_UNICODE)
 	err = ext4_fname_setup_ci_filename(dir, iname, fname);
+	if (err)
+		fscrypt_free_filename(&name);
 #endif
 	return err;
 }