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Mon, 10 Aug 2026 07:58:35 -0700 (PDT) Received: from localhost.localdomain ([47.100.192.162]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-390b1405166sm6541011a91.0.2026.08.10.07.58.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Aug 2026 07:58:35 -0700 (PDT) From: Yang Wen To: linkinjeon@kernel.org, sj1557.seo@samsung.com Cc: yuezhang.mo@sony.com, exfat@lists.linux.dev, linux-kernel@vger.kernel.org, Yang Wen Subject: [PATCH] exfat: fix truncated volume labels returned by FS_IOC_GETFSLABEL Date: Mon, 10 Aug 2026 22:58:14 +0800 Message-Id: <20260810145814.682796-1-anmuxixixi@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" exfat_ioctl_get_volume_label() passes uniname.name_len to exfat_utf16_to_nls() as the output buffer length. However, name_len is the number of UTF-16 code units, while exfat_utf16_to_nls() expects the buffer size in bytes. As a result, volume labels that expand during charset conversion are truncated.The destination buffer is FSLABEL_MAX bytes long, so pass its actual size to the conversion helper. Signed-off-by: Yang Wen --- fs/exfat/file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/exfat/file.c b/fs/exfat/file.c index 5e9b47ecc614..1c1524caaaf7 100644 --- a/fs/exfat/file.c +++ b/fs/exfat/file.c @@ -566,7 +566,7 @@ static int exfat_ioctl_get_volume_label(struct super_bl= ock *sb, unsigned long ar if (ret < 0) return ret; =20 - ret =3D exfat_utf16_to_nls(sb, &uniname, label, uniname.name_len); + ret =3D exfat_utf16_to_nls(sb, &uniname, label, sizeof(label)); if (ret < 0) return ret; =20 --=20 2.34.1