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math/big: prevent large memory consumption in Rat.SetString An attacker can cause unbounded memory growth in a program using (*Rat).SetString due to an unhandled overflow. Upstream-Status: Backport [https://go.dev/issue/50699] CVE: CVE-2022-23772 (From OE-Core rev: e4d15040f62744265b9236ad7276f3371a9172da) Signed-off-by:Minjae Kim <flowergom@gmail.com> Signed-off-by: Steve Sakoman <steve@sakoman.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>