05d984b1a4
b807dfcdc5miner: fix `addPackageTxs` unsigned integer overflow (ismaelsadeeq) Pull request description: This PR fixes an unsigned integer overflow in the `addPackageTxs` method of the `BlockAssembler`. The overflow is a rare edge case that might occur on master when a miner reserves 2000 WU and wants to create an block to be empty. i.e, by starting with `-blockmaxweight=2000`, `-blockreservedweight=2000`, or just `blockmaxweight=2000`, and then calling the mining interface `createNewBlock` with `blockReservedWeight` set to `2000`. Instead of bailing out after going through transactions equivalent to `MAX_CONSECUTIVE_FAILURES`, the loop never breaks until all mempool transactions are visited. See https://github.com/bitcoin/bitcoin/pull/33421#issuecomment-3324859282 The fix avoids the overflow by using addition instead adding `BLOCK_FULL_ENOUGH_WEIGHT_DELTA` to the block weight and comparing it with `m_options.nBlockMaxWeight`. Another alternative that preserves the same structure is to use `static_cast`. Seec9530cf35d. This fix can be tested by cherry-picking the commits from #33421 without the static cast fix and running: ```bash echo "AQAAAAAAA AAnJycnAAAAAAAAAAAAAAAAAA" | base64 --decode > miner.crash FUZZ=block_template_cache ./build_fuzz/bin/fuzz miner.crash ``` --- This is part of a larger inconsistency in how size/weight is represented in the codebase. It may be worth defining a dedicated type for size/weight. ACKs for top commit: glozow: nice, utACKb807dfcdc5furszy: Code ACKb807dfcdc5Tree-SHA512: c1d2f7e500f9b0624a4c22a146921a1644017065e6c94d0c5027486392321f5de26c61751a24765e025e45b34c535adfd6d0e2ac809dea6846b99f37d13043c9
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