Daniel Borkmann e60b0d12a9
bpf: Don't promote bogus looking registers after null check. ...
If we ever get to a point again where we convert a bogus looking <ptr>_or_null
typed register containing a non-zero fixed or variable offset, then lets not
reset these bounds to zero since they are not and also don't promote the register
to a <ptr> type, but instead leave it as <ptr>_or_null. Converting to a unknown
register could be an avenue as well, but then if we run into this case it would
allow to leak a kernel pointer this way.
Fixes: f1174f77b5daniel@iogearbox.net >
Signed-off-by: Alexei Starovoitov <ast@kernel.org >
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