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authorDarrick J. Wong2022-11-10 12:16:34 -0800
committerGreg Kroah-Hartman2023-01-07 11:12:01 +0100
commitb753b0be45ae3eb4a37a6a9efb69a3ba486b81ea (patch)
tree37938bee3898d3963f19d76f16134bee08eeb23a /lib/842/842.h
parent13271fbbe85d73a7c47058f56a52f2a7f00d6e39 (diff)
ext4: don't fail GETFSUUID when the caller provides a long buffer
commit a7e9d977e031fceefe1e7cd69ebd7202d5758b56 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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