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Thu, 22 Jan 2026 23:30:47 -0800 (PST) Received: from lima-ubuntu.hz.ali.com ([47.246.98.220]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-8231873c117sm1339625b3a.47.2026.01.22.23.30.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 22 Jan 2026 23:30:46 -0800 (PST) From: Qing Wang To: ebiggers@kernel.org, tytso@mit.edu, jaegeuk@kernel.org Cc: linux-fscrypt@vger.kernel.org, linux-kernel@vger.kernel.org, Qing Wang , syzbot+d130f98b2c265fae5297@syzkaller.appspotmail.com Subject: [PATCH] fscrypt: Fix uninit-value in ovl_fill_real Date: Fri, 23 Jan 2026 15:30:37 +0800 Message-Id: <20260123073037.4164303-1-wangqing7171@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Syzbot reported a KMSAN uninit-value issue in ovl_fill_real and it was allocated from fscrypt_fname_alloc_buffer. Fixed it by kzalloc. The call chain is: __do_sys_getdents64() -> iterate_dir() ... -> ext4_readdir() -> fscrypt_fname_alloc_buffer() // alloc -> dir_emit() -> ovl_fill_real() // use by strcmp() Reported-by: syzbot+d130f98b2c265fae5297@syzkaller.appspotmail.com Close: https://syzkaller.appspot.com/bug?extid=3Dd130f98b2c265fae5297 Signed-off-by: Qing Wang --- fs/crypto/fname.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/crypto/fname.c b/fs/crypto/fname.c index a9a4432d12ba..ba8282b96a2e 100644 --- a/fs/crypto/fname.c +++ b/fs/crypto/fname.c @@ -220,7 +220,7 @@ int fscrypt_fname_alloc_buffer(u32 max_encrypted_len, u32 max_presented_len =3D max_t(u32, FSCRYPT_NOKEY_NAME_MAX_ENCODED, max_encrypted_len); =20 - crypto_str->name =3D kmalloc(max_presented_len + 1, GFP_NOFS); + crypto_str->name =3D kzalloc(max_presented_len + 1, GFP_NOFS); if (!crypto_str->name) return -ENOMEM; crypto_str->len =3D max_presented_len; --=20 2.34.1