fs/ntfs3: terminate the cached volume label after UTF-8 conversion

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[ Upstream commit a6cd43fe9b ]

ntfs_fill_super() loads the on-disk volume label with utf16s_to_utf8s()
and stores the result in sbi->volume.label. The converted label is later
exposed through ntfs3_label_show() using %s, but utf16s_to_utf8s() only
returns the number of bytes written and does not add a trailing NUL.

If the converted label fills the entire fixed buffer,
ntfs3_label_show() can read past the end of sbi->volume.label while
looking for a terminator.

Terminate the cached label explicitly after a successful conversion and
clamp the exact-full case to the last byte of the buffer.

Fixes: 82cae269cf ("fs/ntfs3: Add initialization of super block")
Signed-off-by: Pengpeng Hou <pengpeng@iscas.ac.cn>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Pengpeng Hou 2026-03-27 14:19:55 +08:00 • committed by Greg Kroah-Hartman

parent ecd60107a9

commit 32b0686369

1 changed files with 6 additions and 1 deletions

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fs/ntfs3/super.c

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