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ext4: don't fail GETFSUUID when the caller provides a long buffer
commit a7e9d97 upstream. If userspace provides a longer UUID buffer than is required, we shouldn't fail the call with EINVAL -- rather, we can fill the caller's buffer with the bytes we /can/ fill, and update the length field to reflect what we copied. This doesn't break the UAPI since we're enabling a case that currently fails, and so far Ted hasn't released a version of e2fsprogs that uses the new ext4 ioctl. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Catherine Hoang <catherine.hoang@oracle.com> Link: https://lore.kernel.org/r/166811139478.327006.13879198441587445544.stgit@magnolia Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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