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46aaec4c0e
(This is a cherry-pick of 390b3cbbb, which I hadn't realized wasn't backpatched. It was originally reported to security@ and determined not to be a vulnerability; thanks to Stanislav Osipov for noticing the omission in the back branches.) In case of torn UTF8 in the input data we might end up going past the end of the string since we don't account for length. While validation won't be performed on a sequence with a NULL byte it's better to avoid going past the end to beging with. Fix by taking the length into consideration. Reported-by: Stanislav Osipov <stasos24@gmail.com> Reviewed-by: Daniel Gustafsson <daniel@yesql.se> Discussion: https://postgr.es/m/CAOYmi+mTnmM172g=_+Yvc47hzzeAsYPy2C4UBY3HK9p-AXNV0g@mail.gmail.com Backpatch-through: 14