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exfat: fix truncated volume labels returned by FS_IOC_GETFSLABEL

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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 <anmuxixixi@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
This commit is contained in:
Yang Wen 2026-08-10 22:58:14 +08:00 committed by Namjae Jeon
parent 0eb24ad05a
commit 27af339219
1 changed files with 1 additions and 1 deletions
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2
fs/exfat/file.c
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@ -566,7 +566,7 @@ static int exfat_ioctl_get_volume_label(struct super_block *sb, unsigned long ar
if (ret < 0)
return ret;
ret = exfat_utf16_to_nls(sb, &uniname, label, uniname.name_len);
ret = exfat_utf16_to_nls(sb, &uniname, label, sizeof(label));
if (ret < 0)
return ret;