ksmbd: fix slab-out-of-bounds in smb_strndup_from_utf16()

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If ->NameOffset/Length is bigger than ->CreateContextsOffset/Length,
ksmbd_check_message doesn't validate request buffer it correctly.
So slab-out-of-bounds warning from calling smb_strndup_from_utf16()
in smb2_open() could happen. If ->NameLength is non-zero, Set the larger
of the two sums (Name and CreateContext size) as the offset and length of
the data area.

Reported-by: Yang Chaoming <lometsj@live.com>
Cc: stable@vger.kernel.org
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

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Namjae Jeon 2023-12-20 15:52:11 +09:00 • committed by Steve French

parent ceb6a6f023

commit d10c77873b

1 changed files with 12 additions and 3 deletions

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fs/smb/server/smb2misc.c

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